StringToInteger(atoi).py

class Solution(object):
    def myAtoi(self, s):
        # Remove any additional spaces before the given string
        s = s.lstrip()

        # If string is empty return 0
        if len(s) == 0:
            return 0

        # String index from where the processing should start
        start = 0

        # Handling numbers with +/- sign
        sign_multiplier = 1
        if s[0] == '-':  # Handling for negative sign numbers
            sign_multiplier = -1
            start = 1
        elif s[0] == '+':  # Handling for signed positive sign number
            start = 1

        result = 0

        index = start
        while index < len(s):
            # Handling for non numeric values
            if not ('0' <= s[index] <= '9'):
                return result * sign_multiplier

            # Calculate the result for current iteration
            result = result * 10 + ord(s[index]) - ord('0')

            # Check if result exceeds MinInt32 or MaxInt32
            min_int_32 = 2 ** 31
            if result * sign_multiplier <= -min_int_32:
                return -min_int_32
            elif result * sign_multiplier >= min_int_32 - 1:
                return min_int_32 - 1
            index += 1

        return result * sign_multiplier