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Python String islower() Method - GeeksforGeeks

Last Updated : 11 Jul, 2025

The islower() method in Python checks if all characters in a string are lowercase. It returns True if all alphabetic characters are lowercase, otherwise, it returns False, if there is at least one uppercase letter.

Let's look at a quick example of using the islower() method.

s = "hello"
res = s.islower()
print(res)

Explanation: The string s contains only lowercase alphabetic characters, so islower() returns True.

s.islower()

• This method doesn't take any parameter.

• The method return True if all alphabetic characters in the string are lowercase, otherwise False.

Let’s look at a few examples of islower() method.

s1 = "hello"
res1 = s1.islower()
print(res1)

s2 = "Hello"
res2 = s2.islower()
print(res2)

s3 = "hello123"
res3 = s3.islower()
print(res3)

s4 = ""
res4 = s4.islower()
print(res4)

s5 = "123@"
res5 = s5.islower()
print(res5)

True
False
True
False
False

Explanation:

• s1 is "hello": contains only lowercase letters, so islower() returns True.
• s2 is "Hello": has an uppercase 'H', so islower() returns False.
• s3 is "hello123": all alphabetic characters are lowercase, so islower() returns True.
• s4 is "": an empty string returns False by default.
• s5 is "123@": contains no alphabetic characters, so islower() returns False. At least one lowercase letter is needed for True.

Related Articles:

• Python String isupper() Method
• Python String isalpha() Method
• Python String isdigit() Method
• Python String isalnum() Method

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