Python String islower() Function

The String islower() method returns True if the string is not empty and all the alphabet characters are lowercase. Otherwise, it returns False.

Syntax

my_string.islower()

islower() Parameters

Python String islower() function does not take any parameters.

islower() Return Value

Python String islower() function returns:

• True if all characters in the string are lowercase.
• False if the string does not contain at least one cased character or if the string contains at least one uppercase alphabetic character.

Examples

Example 1: Check if all characters in the string are lowercase

The islower() method returns True if all characters in the string are lowercase.

my_str = 'abcd'
result = my_str.islower()
print(result) # Output: True

output

True

The method returns False, if the string does not contain at least one cased character.

my_str1 = '123$@%'
my_str2 = 'a123$@%'

print(my_str1.islower()) # Output: False
print(my_str2.islower()) # Output: True

output

False
True

The method also returns False, if the string contains at least one uppercase alphabet.

my_str = '123A$@%'

print(my_str.islower()) # Output: False

output

False

Example 2: Check if an Empty String is lowercase

An empty string is not lowercase.

my_str = ''

print(my_str.islower()) # Output: False

output

False