My goal is to print a backslash in Python3. My input is
links22 = ['1',"n","nkf"]
treee = ['1
The first \ is escaping the second, since \ is illegal. In the first example \ is interpenetrate as escape to >
print["\\\\"]
Will print \\
answered Oct 31, 2019 at 9:13
GuyGuy
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The answer you can find here:
//docs.python.org/3/library/re.html?highlight=comment%20strings
\
Either escapes special characters [permitting you to match characters like '*', '?', and so forth], or signals a special sequence; special sequences are discussed below.
Most of the standard escapes supported by Python string literals are also accepted by the regular expression
parser:
\a \b \f \n
\N \r \t \u
\U \v \x \\
answered Oct 31, 2019 at 9:13
otlukotluk
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The double slash [//] operator is used in python for different purposes. One use of this operator is to get the division result. The division result of two numbers can be an integer or a floating-point number. In python version 3+, both the single slash [/] operator and the double slash [//] operator are used to get the division result containing the floating-point value. One difference is that the single slash operator returns proper
output for the floating-point result, but the double slash operator can’t return the fractional part of the floating-point result. Another use of the double slash [//] operator is to internally define the window path value. Two uses of the double slash [//] operator have been shown in this tutorial.
Example-1: Division using single slash [/] and double slash [//] operator
Create a python file with the following script to check the difference between the output of the single slash
and double slash operator for the division operation. In the script, 5 is defined as the divider value, and 2 is defined as the divisor value. The division result and the type of the result of 5/2, 5//2, 5//2.0, and 5.0//2 will be printed after executing the script.
# Define the divider value
num1 = 5
# Define the divisor value
num2 = 2
# Divide using single slash
result = num1 / num2
print["The division result of %d/%d = %0.2f" % [num1, num2, result]]
print["The type of the result", type[result]]
# Divide using double slash
result = num1 // num2
print["The division result of %d//%d = %0.2f" % [num1, num2, result]]
print["The type of the result", type[result]]
# Divide using double slash and float divisor value
result = num1 // float[num2]
print["The division result of %d//%0.2f = %0.2f" % [num1, num2, result]]
print["The type of the result", type[result]]
# Divide using double slash and float divider value
result = float[num1] // num2
print["The division result of %0.2f//%d = %0.2f" % [num1, num2, result]]
print["The type of the result", type[result]]
Output:
The following output will appear after executing the script. The result of 5/2 is appropriate, and the return type is
float. The result of 5//2 is not appropriate, and the return type is an integer. The fractional part has been omitted from the output. The result of 5//2.00 is not appropriate, and the return type is float. The fractional part has been omitted from this output also. The result of 5.00//2 is not appropriate, and the return type is float. The fractional part has been omitted from this output also.
Example-2: Replace the path defined by the double slash [//] operator
The backward slash [\] is used
to define the path in windows, and slash [/] is used to define the path in Linux operating system. When any windows path is defined in a python variable, then the backward slash [\] is stored by the double slash [\\]. So, the double slash [\\] requires to convert into forward-slash [/] to define the path in Linux format. Create a python file with the following script that assigns a windows path into a variable and replaces the double slash of the path with the forward-slash [/]. The original and
updated paths will be printed after executing the script.
# Define a path
pathVal = r"C:\Windows\System\Speech"
# Print the path value
print["The original path value:\n", pathVal]
# Replace the path by forward slash[/]
updated_path =
pathVal.replace["\\", "/"]
# Print the updated path
print["The updated path value:\n", updated_path]
Output:
The following output will appear after executing the script. The output shows that the windows path has been converted into the Linux path format.
Conclusion:
The use of the double slash [//] operator in Python 3+ has been shown in this tutorial by using simple examples to understand the purposes of using this operator.
About the author
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How do you do a double slash in Python?
Contents Index. In Python, we can perform floor division [also sometimes known as integer division] using the // operator. This operator will divide the first argument by the second and round the result down to the nearest whole number, making it equivalent to the math. floor[] function.
What does 2 slashes do in Python?
Python has two division operators, a single slash character for classic division and a double-slash for “floor” division [rounds down to nearest whole number]. Classic division means that if the operands are both integers, it will perform floor division, while for floating point numbers, it represents true division.
How do you write a slash in a string in Python?
In short, to match a literal backslash, one has to write '\\\\' as the RE string, because the regular expression must be "\\", and each backslash must be expressed as "\\" inside a regular Python string literal.
What is double slash?
The slash is used as a division operator in most programming languages while APL uses it for reduction [fold] and compression [filter]. The double slash is used by Rexx as a modulo operator, and Python [starting in version 2.2] uses a double slash for division which rounds [using floor] to an integer.