python3比较版本号方法封装

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废话不多说，自己封装的方法，代码自己看，有注释，本人感觉已经很好了，如有还需优化的地方请评论留言，谢谢。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @File      : compare.py

import re


class CompareSize:
    only_point_num = "\.{2,100}"
    ver_format = "^\d+(\.\d+){0,100}$"
    VERSION_ERR = "Please check the version number, example '6.2.3'."
    VERSION_TYPE_ERR = "Wrong type, please input string."

    @classmethod
    def compare_version(cls, old, new):
        """
        Compare the size of the version number.

        Compare the size of the two incoming version numbers (Format: 6.0.1),
        first judge whether the format and type of the version number are correct,
        then split the version number, and finally compare the size.

        :param old: Version number. type：str
        :param new: Version number. type：str
        :return: True: new > old, False: old > new, equal: old = new
        :rtype: str
        """
        
        try:
            result_old = re.search(cls.only_point_num, old)
            result_new = re.search(cls.only_point_num, new)

        except TypeError:
            return cls.VERSION_TYPE_ERR

        else:
            if not (result_old and result_new) is None:
                return cls.VERSION_ERR

            else:
                ver_format_old = re.search(cls.ver_format, old)
                ver_format_new = re.search(cls.ver_format, new)

                if not (ver_format_old and ver_format_new):
                    return cls.VERSION_ERR
                else:
                    try:
                        list_old = old.split('.')
                        list_new = new.split('.')

                    except AttributeError:
                        return cls.VERSION_ERR

                    else:
                        if len(list_old) > len(list_new):
                            version_len = len(list_old)
                        else:
                            version_len = len(list_new)

                        for i in range(version_len):
                            try:
                                if int(list_old[i]) > int(list_new[i]):
                                    return 'False'
                                elif int(list_old[i]) == int(list_new[i]):
                                    continue
                                else:
                                    return 'True'

                            except IndexError:
                                if len(list_old) > len(list_new):
                                    return 'False'
                                else:
                                    return 'True'

                        return 'equal'

觉得可以的话点个赞呗，谢谢。

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