version number comparison

class Solution:
    # @param A : string
    # @param B : string
    # @return an integer
    def compareVersion(self, A, B):
        print(type(A))
        version_list_A = A.split(".")
        version_list_B = B.split(".")
        if A==B:
            return 0
        if len(version_list_A) == len(version_list_B):
            for i in range(len(version_list_A)):
                if version_list_A[i] == version_list_B:
                    continue
                elif version_list_A[i] > version_list_B[i]:
                    return 1
                else:
                    return -1
        #1.13 < 1.13.4
        #7.3 > 1.1.3
        #0.4 < 1.1.3
        if len(version_list_A) < len(version_list_B):
            if version_list_A == version_list_B[:len(version_list_A)-1]:
                return -1
            else:
                return self.compareVersion("".join(version_list_A), "".join(version_list_B[:len(version_list_A)-1]))
        # 1.4.6 > 1.4
        if len(version_list_A) > len(version_list_B):
            if version_list_A[:len(version_list_B)-1]==version_list_B:
                return 1
            else:
                return self.compareVersion("".join(version_list_A[:len(version_list_B)-1]), "".join(version_list_B))




s = Solution()
print(s.compareVersion("1.13.9", "1.13.1"))

/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4 /Users/mona/PycharmProjects/PythonCodes/compare_version.py
<class 'str'>
-1

Process finished with exit code 0