python jsonpath 断言，or用法

def test_json_extractor(obj:dict,expr):

    # the obj must be dict
    get_value=jsonpath.jsonpath(obj,expr)

    return get_value or None

def test_or_return():
    """优先级是not>and>or"""

    d = {'a': 'aaa', 'b': None}
    res= d.get('b', '') or 'bbb'
    print(res)
    return res # bbb

def simple_else(p1,p2):
    """ 
    if p1  return p1 else return  p2
    a = None or 2
    b= [] or 1
    """
    v = p1 or p2
    return v