Check if all characters of a string are uppercase

You should use str.isupper() and str.isalpha() function.

Eg.

is_all_uppercase = word.isupper() and word.isalpha()

According to the docs:

S.isupper() -> bool
Return True if all cased characters in S are uppercase and there is at least one cased character in S, False otherwise.

You could use regular expressions:

all_uppercase = bool(re.match(r'[A-Z]+$', word))

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