leetcode/string-to-integer-atoi at master · NikhilRaverkar/leetcode · GitHub

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class Solution(object):
    def myAtoi(self, str):
        """
        :type str: str
        :rtype: int
        """

        num = 0
        sign = 0
        started=0
        for c in str:

            if ord(c) > 47 and ord(c) < 58:
                num = 10 * num + int(c)
                started=1
            elif (c) == ' ' and started==0:
                continue
            elif c == "-" and started == 0:
                started=1
                sign = -1
                continue
            elif c == "+" and started == 0:
                sign = 1
                started=1
                continue
            else:
                break
        num = int(num * (sign**sign))
        if num < -2 ** 31:
            return (-2 ** 31)
        if num > 2 ** 31 - 1:
            return (2 ** 31 - 1)
        return  num
if __name__ =="__main__":
   print( Solution().myAtoi("+0 123"))