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Reference article: Issues related to Python string operations

String case conversion

str.lower() Strings are all lowercase.
str.upper() The string is all uppercase.
str.capitalize() Capitalize the first letter of the string.
str.title() The first letter of each word in the string is capitalized.

>>> str = 'my world, MY PYTHON'
>>> str.lower()
'my world, my python'
>>> str.upper()
'MY WORLD, MY PYTHON'
>>> str.capitalize()
'My world, my python'
>>> str.title()
'My World, My Python'

str.title()