str.isupper
Check that all letters of the string are uppercase.
Python 3.13
str.isupper()Return value
True or False; False for a string without letters.
Examples
Uppercase letters only
Python 3.13
print('HELLO'.isupper())True
Digits and punctuation do not matter
Python 3.13
print('HELLO 2024!'.isupper(), '2024'.isupper())True False
Details
Characters without case, such as digits, spaces and punctuation, do not affect the check, but there must be at least one letter: "2024".isupper() gives False.