The str.islower() method checks if all the letters in a string are lowercase. If yes, the string is considered to be lower case.
Example
#!/usr/bin/python3
# -*- coding: UTF-8 -*-
str1 = 'abcdefg'
str2 = 'abc.!123 '
str3 = 'abcDeFg'
print (str1.islower())
print (str2.islower())
print (str3.islower())
Output:
True
True
False
Syntax
str.islower()
Parameters
The method doesn’t take any parameters.
Return Value
It returns true and false, depending on whether the string is lowercase or not.