python对文本文档的读写和删除操作-2

项目需要，首先需要读取json格式存储的文本文档，该文本文档存在指定的目录中，该目录下有很多的文本文档，需要在文本文档中找到里面的calls数据，然后把calls数据返回，供robotframework 调用，然后在另一个测试用例中将calls数据和时间间隔写入另一个文本文档中。

#-*- coding:utf-8 -*-import osclass Write_in_Txt(object):    def __init__(self):        self._write_in_file = None    def get_written_data(self, calls1, calls2):        dict_call = {"calls_before" :calls1, "calls_after" :calls2}        return dict_call    def write_to_txt_file(self, file_path, dict_call, time_interval):        if not os.path.exists(file_path):            file_name = open(file_path, 'w')            for key,value in dict_call.items():                print 'key',key                print 'value',value                file_name.write(key + ":" + value + '---')            file_name.write('time_interval:' + time_interval)            file_name.write('\n')            file_name.close()        else:            file_name = open(file_path, 'a')            for key,value in dict_call.items():                 print 'key',key                 print 'value',value                 file_name.write(key + ":" + value + '---')            file_name.write('time_interval:' + time_interval)            file_name.write('\n')            file_name.close()if __name__ == '__main__':    current_dir = os.getcwd()    print 'current_dir', current_dir    file_path = current_dir +"\\" + "\\calls_collection.txt"    write_in_file = Write_in_Txt()    dict_data = write_in_file.get_written_data("10","11")    write_in_file.write_to_txt_file(file_path, dict_data, "2016-08-01~2016-08-10")    dict_data2 = write_in_file.get_written_data("5","6")    write_in_file.write_to_txt_file(file_path, dict_data, "2016-05-01~2016-05-10")