Python String isupper() Method

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

Syntax

my_string.isupper()

issuper() Parameters

Python String issuper() method does not take any parameters.

issuper() Return Value

Python String issuper() method returns:

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

Examples

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

The isupper() method returns True if all characters in the string are uppercase.

my_str = 'abcd'
result = my_str.isupper()
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.isupper()) # Output: False
print(my_str2.isupper()) # Output: True

output

False
True

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

my_str = '123a$@%'

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

output

False

Example 2: Check if an Empty String is uppercase

An empty string is not lowercase.

my_str = ''

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

output

False