python对象的自省机制

#自省是通过一定的机制查询到对象的内部结构
from chapter04.class_method import Date
class Person:
    """
    人
    """
    name = "user"

class Student(Person):
    def __init__(self, scool_name):
        self.scool_name = scool_name

if __name__ == "__main__":
    user = Student("北京大学")

    #通过__dict__查询属性
    # print(user.__dict__)
    # user.__dict__["school_addr"] = "北京市"
    # print(user.school_addr)
    # print(Person.__dict__)
    # print(user.name)
    a = [1,2]
    print(dir(a))

　　['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']

 

#自省是通过一定的机制查询到对象的内部结构
from class_method import Date
class Person:
    """
    人
    """
    name = "user"

class Student(Person):
    def __init__(self, scool_name):
        self.scool_name = scool_name

if __name__ == "__main__":
    user = Student("北京大学")

    #通过__dict__查询属性
    print(user.__dict__)
    user.__dict__["school_addr"] = "北京市"
    print(user.school_addr)
    print(Person.__dict__)
    print(user.name)
    # a = [1,2]
    # print(dir(a))

　

{'scool_name': 北京大学'}

北京市
{'name': 'user', '__weakref__': <attribute '__weakref__' of 'Person' objects>, '__module__': '__main__', '__doc__': '\n 人\n ', '__dict__': <attribute '__dict__' of 'Person' objects>}
user