Conversion of string to upper case without inbuilt methods

Question

I am trying to perform conversion from a lowercase to uppercase on a string without using any inbuilt functions (other than ord() and char()). Following the logic presented on a

Answer 1

The best way, in my opinion is using a helper string, representing the alphabet, if you do not want to use chr() and ord():

def toUppercase(s):
    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
    result = ''
    for x in s:
        if x not in alphabet or alphabet.index(x)>=26:
            result += x
        else:
            result += alphabet[alphabet.index(x)+26]
    return result

This also handles punctuation such as ; or ..

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Update:

As per the OP's request, this is a version without index():

def toUppercase(s):
    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
    result = ''
    for x in s:
        for pos in range(52):
            if alphabet[pos] == x:
                i = pos
        if x not in alphabet or i>=26:
            result += x
        else:
            result += alphabet[i+26]
    return result

print(toUppercase('abcdj;shjgh'))