# -*- coding=utf-8 -*-
import json

def check_json_format(raw_msg):
 """
 用于判断一个字符串是否符合Json格式
 :param self:
 :return:
 """
 if isinstance(raw_msg, str):  # 首先判断变量是否为字符串
  try:
   json.loads(raw_msg, encoding='utf-8')
  except ValueError:
   return False
  return True
 else:
  return False

if __name__ == "__main__":
 print check_json_format("""{"a":1}""")
 print check_json_format("""{'a':1}""")
 print check_json_format({'a': 1})
 print check_json_format(100)

True
False
False
False