Python String islower()

The syntax of islower() is:

 string.islower()

islower() parameters

The islower() method doesn't take any parameters.

Return Value from islower()

The islower() method returns:

• True if all alphabets that exist in the string are lowercase alphabets.
• False if the string contains at least one uppercase alphabet.

Example 1: Return Value from islower()

 s = 'this is good' print(s.islower()) s = 'th!s is a1so g00d' print(s.islower()) s = 'this is Not good' print(s.islower())

Output

 True True False 

Example 2: How to use islower() in a program?

 s = 'this is good' if s.islower() == True: print('Does not contain uppercase letter.') else: print('Contains uppercase letter.') s = 'this is Good' if s.islower() == True: print('Does not contain uppercase letter.') else: print('Contains uppercase letter.')

Output

 Does not contain uppercase letter. Contains uppercase letter.

Also Read:

• Python String isupper()
• Python String lower()