Python | isupper() and islower() methods to check if a string is in all uppercase or lowercase letters

str1 = 'COPYASSIGNMENT'
str2 = 'copyassignment'

print(str1.isupper()) # True, all letters are uppercase
print(str1.islower()) # False

print(str2.islower()) # True, all letters are lowercase
print(str2.isupper()) # False

Output:

True
False
True
False

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