How to change a string into uppercase

Use str.upper():

>>> s = 'sdsd'
>>> s.upper()
'SDSD'

See String Methods.

To get upper case version of a string you can use str.upper:

s = 'sdsd'
s.upper()
#=> 'SDSD'

On the other hand string.ascii_uppercase is a string containing all ASCII letters in upper case:

import string
string.ascii_uppercase
#=> 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

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