how to convert character to uppercase 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: how do you change a string to only uppercase in python

original = Hello, World!

#both of these work
upper = original.upper()
upper = upper(original)

Example 3: python capitalize the entire string

message="hi"
print(message)
print(message.upper())