如何强制静态方法在Python中使用本地非全局变量？

Question

我在一个类中有一个静态方法，由该类的另一个静态方法调用并返回它应该创建的变量，但它似乎正在创建全局变量并在它应该返回时重新返回None < / p>

class LineHandler:

    @staticmethod
    def file_tocsv(_file):
        line_number=0
        csv_dict = {}
        for linex in _file:
            linex_dict = Utils._to_utf(kline)
            csv_dict, line_number = LineHandler.line_tocsv(csv_dict, linex_dict, line_number)

    @staticmethod
    def line_tocsv(csv_dict={}, line={}, current_line=0):
        csv_line, current_line = LineHandler.create_csv(current_line, kline)
        if current_line in csv_dict:
            csv_dict[current_line].update(csv_line)
        else:
            csv_dict[current_line] = csv_line 
        return csv_dict


    @staticmethod
    def create_csv(line_number, kline={}, csv_line={}):
        #retval dict 
        bracket = kline.get('][',None)
        text = kline.get('line',None)
        star = kline.get('*',None)
        at = kline.get('@',None)

        string = ''; string2 = ''
        if star:
            string2, csv_line, is_newline = LineHandler._star( star, string2, csv_line) 
            line_number += is_newline
        if at:
            csv_line = LineHandler._effect(at, csv_line) 
        if bracket and text:
            csv_line = LineHandler._text(bracket, csv_line, text) 
        return csv_line, line_number

正如我所说的那样，只要它进入第三个功能，csv_line var仍然存在而不是成为{} !!