Python判断变量是否为Json格式的字符串

# -*- 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
    """
    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))