How do i print only lowercase in python?

How can I write the code so python ONLY prints out the lower case letters of the string. In this case, it should exclude the P.

I tried this:

word = "Programming is fun!"

for letter in word:
        if letter.lower():
        print letter

But it doesn't solely print out the lowercase letters. How could I only get the lower-case characters out of the string instead of the whole string in lower-case.

asked Dec 24, 2015 at 2:03

Jason_SilvaJason_Silva

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2

You want letter.islower() (which tests), not letter.lower() (which converts).

If you want to print non-cased characters too, you'd check:

if letter.islower() or not letter.isalpha():

answered Dec 24, 2015 at 2:05

ShadowRangerShadowRanger

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Try using islower instead :

letter.islower()

answered Dec 24, 2015 at 2:05

astrosyamastrosyam

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Yours doesn't work because you've called .lower(), which is a method of the String class - it changes the case of the letter in question, and results in True.

There are likely many ways to obtain the result you want, the simplest I can think of being:

word = "Hello World!"
for letter in word:
    if letter.islower():
        print(letter)

Note that there is an equality test in mine, which is what yours is missing.

EDIT: As other answers pointed out, .islower() is a more succinct way of checking the case of the letter. Similarly, .isupper() would print only the capital letters.

answered Dec 24, 2015 at 2:11

BlackbeardBlackbeard

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You could use

print filter(lambda c: c.islower(), word)

answered Dec 24, 2015 at 2:05

Frerich RaabeFrerich Raabe

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What will actually answer to your question (as i can tell from provided output) will be something like: import string word="Programming is fun!" filter(lambda c: c.islower() or not(c.isupper() and c in string.printable), word)

answered Dec 24, 2015 at 2:25

Sometimes, while working with strings, we are concerned about the case sensitivity of strings and might require getting just a specific case of character in a long string. Let’s discuss certain ways in which only lowercase letters can be extracted from a string. 

Method #1: Using list comprehension + islower() 

List comprehension and islower function can be used to perform this particular task. The list comprehension is primarily used to iterate over the list and islower function checks for the lowercase characters. 

Python3

test_str = "

GeeksForGeeKs & quot

print(& quot

       The original string is : & quot

       + str(test_str))

res = [char for char in test_str if char.islower()]

print(& quot

       The lowercase characters in string are : & quot

       + str(res))

Output : 

The original string is : GeeksForGeeKs The lowercase characters in string are : [‘e’, ‘e’, ‘k’, ‘s’, ‘o’, ‘r’, ‘e’, ‘e’, ‘s’]

Method #2: Using filter() + lambda 

Filter function along with lambda functionality can be used to perform this particular task. The filter function performs the specific selection of case characters and the lambda function is used for string traversal. 

Python3

test_str = "

GeeksForGeeKs & quot

print(& quot

       The original string is : & quot

       + str(test_str))

res = list(filter(lambda c: c.islower(), test_str))

print(& quot

       The lowercase characters in string are : & quot

       + str(res))

Output : 

The original string is : GeeksForGeeKs The lowercase characters in string are : [‘e’, ‘e’, ‘k’, ‘s’, ‘o’, ‘r’, ‘e’, ‘e’, ‘s’]

Method #3: Without using islower() builtin method

Python3

test_str = "GeeksForGeeKs"

loweralphabets = "abcdefghijklmnopqrstuvwxyz"

print("The original string is : " + str(test_str))

res = []

for i in test_str:

    if i in loweralphabets:

        res.append(i)

print("The lowercase characters in string are : " + str(res))

Output

The original string is : GeeksForGeeKs
The lowercase characters in string are : ['e', 'e', 'k', 's', 'o', 'r', 'e', 'e', 's']

Method #4: Using ord() method.The ASCII value of the lowercase alphabet is from 97 to 122. 

Python3

test_str = "GeeksForGeeKs"

print("The original string is : " + str(test_str))

res = []

for i in test_str:

    if ord(i) in range(97, 123):

        res.append(i)

print("The lowercase characters in string are : " + str(res))

Output

The original string is : GeeksForGeeKs
The lowercase characters in string are : ['e', 'e', 'k', 's', 'o', 'r', 'e', 'e', 's']

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