python使用参数对嵌套字典进行取值的实例操作

 def dict_get(dic, locators, default=None):

 '''

 :param dic: 输入需要在其中取值的原始字典 <dict>
 :param locators: 输入取值定位器, 如:['result', 'msg', '-1', 'status'] <list>
 :param default: 进行取值中报错时所返回的默认值 (default: None)
 :return: 返回根据参数locators找出的值

 '''

 if not isinstance(dic, dict) or not isinstance(locators, list):
  return default

 value = None

 for locator in locators:
  if not type(value) in [dict, list] and isinstance(locator, str) and not can_convert_to_int(locator):
  try:
   value = dic[locator]
  except KeyError:
   return default
  continue
  if isinstance(value, dict):
  try:
   value = dict_get(value, [locator])
  except KeyError:
   return default
  continue
  if isinstance(value, list) and can_convert_to_int(locator):
  try:
   value = value[int(locator)]
  except IndexError:
   return default
  continue

 return value

 def can_convert_to_int(input):
 try:
  int(input)
  return True
 except BaseException:
  return False

if __name__ == '__main__':
 dict_test = {"result": {"code": "110002", "msg": [{'status': 'ok'}, {'status': 'failed'}]}}
 result = dict_get(dict_test, ['result', 'msg', '-1', 'status'])
 print(result)