code: def set_config(self, key, value):
          '''set {key:value} paris to self.config'''
          self.config = self.read_file()
          self.config[key] = value
          self.write_file(f set_config(self, key, value):
          '''set {key:value} paris to self.config'''
          self.config = self.read_file()
          self.config[key] = value
          self.write_file()
docs: set {key:value} paris to self.config