Convert a string to uppercase and lowercase in Python

This post will discuss how to convert a string to uppercase and lowercase in Python.

1. Convert to uppercase

The built-in function str.upper provides a simple, clean way to convert a string to uppercase in Python. Here’s an example:

if __name__ == '__main__':

s = 'abc'

s = s.upper()

print(s) # ABC

If you just need to check whether all the characters in the string are uppercase, you can use the str.isupper function.

if __name__ == '__main__':

s = 'ABC'

if s.isupper():

print("String is uppercase")

else:

print("String is not uppercase")

Similarly, you can use the built-in str.lower function for converting the string to lowercase:

if __name__ == '__main__':

s = 'ABC'

s = s.lower()

print(s) # abc

If you just need to check whether all the characters in the string are lowercase, you can use the str.islower function.

if __name__ == '__main__':

s = 'abc'

if s.islower():

print("String is lowercase")

else:

print("String is not lowercase")

That’s all about converting a string to uppercase and lowercase in Python.