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Mục lục bài viết

• Kiểu Boolean Python
  • Python Booleans làm Từ khóa
  • Python Booleans dưới dạng số
• Toán tử Boolean
  • Các nhà khai thác không có đầu vào
  • Toán tử không phải Boolean
  • Toán tử và Boolean
  • Toán tử hoặc Boolean
  • Các toán tử Boolean khác
• So sánh toán tử
  • Bình đẳng và Bất bình đẳng
  • So sánh đơn hàng
  • Nhà điều hành là
  • Nhà điều hành trong
  • Các chuỗi so sánh toán tử
• Thử nghiệm Boolean trong Python
  • No Boolean value
  • Các số dưới dạng giá trị Boolean
  • Chuỗi dưới định dạng giá trị Boolean
  • Các loại khác nhau dưới dạng giá trị Boolean
  • Ví dụ. Mang NumPy
  • Toán tử và Chức năng
• Phần kết luận

Type Boolean trong Python là một trong các kiểu dữ liệu sẵn có của Python. Nó được sử dụng để biểu thị giá trị chân lý của một biểu thức. Ví dụ, biểu thức 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Trong hướng dẫn này, bạn sẽ học cách

• Thao tác các giá trị Boolean với các toán tử Boolean
• Chuyển đổi Boolean sang các loại khác
• Chuyển đổi các loại khác nhau sang Python Booleans
• Sử dụng Python Booleans để viết mã Python hiệu quả và dễ đọc

Kiểu Boolean Python

Boolean Type in Python only have two value can be

1. >>> lines = """\
   .. He took his vorpal sword in hand;
   ..       Long time the manxome foe he sought—
   .. So rested he by the Tumtum tree
   ..       And stood awhile in thought.
   .. """
   >>> line_list = lines.splitlines[]
   >>> "the" in line_list[0]
   False
   >>> "the" in line_list[1]
   True
   >>> 0 + False + True # Equivalent to 0 + 0 + 1
   1
   >>> ["the" in line for line in line_list]
   [False, True, True, False]
   >>> False + True + True + False
   2
   >>> len[line_list]
   4
   >>> 2/4
   0.5
   

   1

2. >>> lines = """\
   .. He took his vorpal sword in hand;
   ..       Long time the manxome foe he sought—
   .. So rested he by the Tumtum tree
   ..       And stood awhile in thought.
   .. """
   >>> line_list = lines.splitlines[]
   >>> "the" in line_list[0]
   False
   >>> "the" in line_list[1]
   True
   >>> 0 + False + True # Equivalent to 0 + 0 + 1
   1
   >>> ["the" in line for line in line_list]
   [False, True, True, False]
   >>> False + True + True + False
   2
   >>> len[line_list]
   4
   >>> 2/4
   0.5
   

   3

Không có giá trị nào khác sẽ có ______06như loại của nó. Bạn có thể kiểm tra loại 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Của 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Kiểu 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Mặc dù có thể về mặt kỹ thuật, nhưng để tránh nhầm lẫn, bạn không nên gán một giá trị khác cho

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Python Booleans làm Từ khóa

Hiện tại tên không phải là từ khóa. Đối với ngôn ngữ Python, chúng là các biến thông thường. Nếu bạn chỉ định cho họ, thì bạn sẽ ghi đè giá trị hợp nhất sẵn có

Ngược lại, các tên 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Có thể gán giá trị Boolean cho các biến, nhưng không thể gán giá trị cho

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Because

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Bạn không thể chỉ định cho 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Booleans Python dưới dạng số

Booleans được coi là một loại số trong Python. Điều này có nghĩa là chúng là những con số cho tất cả ý định và mục đích. Nói cách khác, bạn có thể áp dụng các phép toán số học cho Booleans và bạn cũng có thể so sánh chúng với các số

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Không có nhiều cách sử dụng bản chất số của các giá trị Boolean, nhưng có một kỹ thuật mà bạn có thể thấy hữu ích. Bởi vì 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Ví dụ: nếu bạn muốn phân tích một câu trong bài thơ cổ điển dành cho trẻ em để xem có bao nhiêu phần của dòng chứa từ 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Tính tổng tất cả các giá trị trong một biểu thức trình tạo như thế này cho phép bạn biết số lần 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Để xem tại sao điều này đang hoạt động, bạn có thể chia đoạn mã thành các phần nhỏ hơn

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Các 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Because

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Toán tử Boolean

Toán tử Boolean là những toán tử nhận đầu vào Boolean và trả về kết quả Boolean

Lưu ý. Sau đó, bạn sẽ thấy rằng các toán tử này có thể được cung cấp các đầu vào khác và không phải lúc nào cũng trả về kết quả Boolean. Hiện tại, tất cả các ví dụ sẽ sử dụng đầu vào và kết quả Boolean. Bạn sẽ thấy cách điều chỉnh này tổng hợp cho các giá trị khác nhau trong phần về mức độ tin

Vì các giá trị Boolean trong Python chỉ có hai tùy chọn khả thi, 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Như bạn sẽ thấy ở phần sau, trong một số vấn đề, hãy biết đầu vào cho một thuật toán là đủ để xác định giá trị của nó. Trong những trường hợp đó, đầu vào khác không được đánh giá. This is call is đánh giá ngắn mạch

Tầm quan trọng của việc đánh giá việc rút ngắn mạch phụ thuộc vào từng trường hợp cụ thể. Trong một số trường hợp, nó có thể ảnh hưởng ít đến chương trình của bạn. Trong các trường hợp khác nhau, chẳng hạn như khi cần tính toán nhiều để đánh giá các biểu thức không ảnh hưởng đến kết quả, nó mang lại lợi ích đáng kể. Trong những trường hợp khắc nghiệt nhất, tính toán đúng đắn của mã của bạn có thể phụ thuộc vào việc đánh giá ngắn mạch

Các nhà khai thác không có đầu vào

Bạn có thể nghĩ về 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Việc coi các giá trị Boolean trong Python như các thuật toán đôi khi rất hữu ích. Ví dụ. cách tiếp cận này giúp nhắc nhở bạn rằng chúng không phải là các biến. Vì lý do tương tự mà bạn không thể chỉ định cho 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Chỉ có hai giá trị Boolean trong Python tồn tại. Toán tử Boolean không có đầu vào luôn trả về cùng một giá trị. By because this thing, 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Các 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

733Boolean điều hành

Toán tử Boolean duy nhất có một đối số là 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Bảng này minh họa 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>>

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Dòng cuối cùng cho thấy 

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

Bạn có thể tự hỏi tại sao không có toán tử Boolean nào khác nhận một đối số duy nhất. Để hiểu lý thuyết tại sao, bạn có thể nhìn vào bảng hiển thị tất cả các toán tử Boolean về mặt lý thuyết có thể sử dụng một số đối số

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5

>>> lines = """\
.. He took his vorpal sword in hand;
..       Long time the manxome foe he sought—
.. So rested he by the Tumtum tree
..       And stood awhile in thought.
.. """
>>> line_list = lines.splitlines[]
>>> "the" in line_list[0]
False
>>> "the" in line_list[1]
True
>>> 0 + False + True # Equivalent to 0 + 0 + 1
1
>>> ["the" in line for line in line_list]
[False, True, True, False]
>>> False + True + True + False
2
>>> len[line_list]
4
>>> 2/4
0.5