upper.py

def upper(word: str) -> str:
 """
 Will convert the entire string to uppercase letters

 >>> upper("wow")
 'WOW'
 >>> upper("Hello")
 'HELLO'
 >>> upper("WHAT")
 'WHAT'
 >>> upper("wh[]32")
 'WH[]32'
 """

 # Converting to ascii value int value and checking to see if char is a lower letter
 # if it is a lowercase letter it is getting shift by 32 which makes it an uppercase
 # case letter
 return "".join(chr(ord(char) - 32) if "a" <= char <= "z" else char for char in word)


if __name__ == "__main__":
 from doctest import testmod

 testmod()