Upper case conversion Python

PROGRAM TO CONVERT LOWER CASE CHARACTERS TO UPPER CASE CHARACTERS

# Converts a string to uppercase

def to_upper(string):

    for i in range(len(string)):

        if ('a' <= string[i] <= 'z'):

            string = (string[0:i] + chr(ord(string[i]) - 

                                        ord('a') + ord('A')) +

                                        string[i + 1:])

    return string;

  

# Driver code

if __name__ == '__main__':

    str = "geeksforgeeks";

    print(to_upper(str));







OUTPUT

GEEKSFORGEEKS

CREDITS: https://www.geeksforgeeks.org/lower-case-upper-case-interesting-fact/