how to convert all strings to lowercase in python code example

Example 1: how to change a string to small letter in python

my_str = "Hello World"
my_str.lower()
print(my_str)

Example 2: python string lowercase

startString = "TeST StrIng"
lowerCaseString = startString.lower()
print(lowerCaseString)
# Output -> "test string"