How to use 'string multiplication python' in Python

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def multiplication(one_num, two_num):
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    total = 0
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    other_count = 0
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    # Find bigger number in order to set length of both numbers
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    if len(one_num) >= len(two_num):
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        longer = one_num
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        shorter = two_num
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    else:
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        longer = two_num
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        shorter = one_num
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    # Add zeroes to the front of the smaller number until lengths are equal.
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    for i in range(len(longer) - len(shorter)):
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        shorter = '0' + shorter
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    for i in range(len(shorter) - 1, -1, -1):
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        count = 0
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        for j in range(len(longer) - 1, -1, -1):
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            big_num = longer[j] + ('0' * count)
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            product = int(big_num) * int(shorter[i] + '0' * other_count)
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            total += product
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            count += 1
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        other_count += 1
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    print(str(one_num) + ' * ' + str(two_num) + ' = ' + str(total))

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def multiply(self, num1, num2):
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    """
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    :type num1: str
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    :type num2: str
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    :rtype: str
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    """
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    return str(int(num1) * int(num2))