Compare Version Numbers

class Solution(object):
    def compareVersion(self, version1, version2):
        """
        :type version1: str
        :type version2: str
        :rtype: int
        """
        num_list1=version1.split('.')
        num_list2=version2.split('.')
        num_len1=len(num_list1)
        num_len2=len(num_list2)
        while num_len1 > 0:
            if int(num_list1[num_len1 - 1]) == 0:
                num_list1 = num_list1[:-1]
                num_len1 = num_len1 -1
            else:
                break
        while num_len2 > 0:
            if int(num_list2[num_len2 - 1]) == 0:
                num_list2 = num_list2[:-1]
                num_len2 = num_len2 -1
            else:
                break
        if num_len1 < num_len2:
            for i in range(num_len1):
                if int(num_list1[i]) < int(num_list2[i]):
                    return -1
                elif int(num_list1[i]) > int(num_list2[i]):
                    return 1
            return -1
        else:
            for i in range(num_len2):
                if int(num_list1[i]) < int(num_list2[i]):
                    return -1
                elif int(num_list1[i]) > int(num_list2[i]):
                    return 1
            if num_len1 == num_len2:
                return 0
            else:
                return 1