字符串转换成python中exec能执行的函数

最新推荐文章于 2024-02-26 11:53:28 发布

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本文介绍了一个Python程序，该程序能够将特定标记的条件语句转换为格式化的、可执行的Python代码。通过解析输入字符串，程序可以识别并转换if、elif、else等语句，并正确地处理缩进。

#获得格式化后python能执行的字符串
    def getPYExecStr(self, strs):
        if strs.find('if' + self.marked) != -1:
            strs = strs[strs.find('if' + self.marked):]
        backStr = ''
        struct = ''
        lineSpace = '    '
        gradeNum = 0
        isFirstStr = True
        lines = strs.splitlines()
        for li in lines:
            li = li.strip()
            if li.startswith('if' + self.marked):
                backStr = self.__addStrToBackStr(struct, gradeNum, lineSpace, backStr)
                isFirstStr = True
                backStr +=  gradeNum * lineSpace + li.replace(self.marked, '') + ':' + os.linesep
                gradeNum += 1
            elif li.startswith('elif' + self.marked):
                backStr = self.__addStrToBackStr(struct, gradeNum, lineSpace, backStr)
                isFirstStr = True
                backStr += (gradeNum - 1) * lineSpace + li.replace(self.marked, '') + ':' + os.linesep
            elif li.startswith('else' + self.marked):
                backStr = self.__addStrToBackStr(struct, gradeNum, lineSpace, backStr)
                isFirstStr = True
                backStr += (gradeNum - 1) * lineSpace + li.replace(self.marked, '') + ':' + os.linesep
            elif li.startswith('endif' + self.marked):
                backStr = self.__addStrToBackStr(struct, gradeNum, lineSpace, backStr)
                isFirstStr = True
                gradeNum -= 1
            else:
                if isFirstStr:
                    struct = ''
                    struct += "self.structStr = \"" + li + "os.linesep"
                    isFirstStr = False
                else:
                    struct += li + "os.linesep"
        backStr = self.__addStrToBackStr(struct, gradeNum, lineSpace, backStr)
        return backStr

    #添加字符串到BackStr中（私有方法）
    def __addStrToBackStr(self, struct, gradeNum, lineSpace, backStr):
        if struct:
            struct = struct[:struct.rfind('os.linesep')]
            backStr += gradeNum * lineSpace + struct + '"' + os.linesep
        return backStr

self.marked = '$'