string lowercase python

1my_str = "Hello World"
2my_str.lower()
3print(my_str) # outputs "hello world" on the terminal

1str = 'HELLO'
2print(str.lower())
3
4#prints "hello"

1original = Hello, World!
2
3#both of these work
4upper = original.upper()
5upper = upper(original)

1str = 'heLLo WorLD'
2print(str.lower())
3# hello world

1import string
2print string.ascii_lowercaseOutputabcdefghijklmnopqrstuvwxyz
3

1string.upper()
2string.lower()