class A(object):

    def __init__(self):

        self.name = "sath"

    def get(self):

        print("get")

a = A()

setattr(a, "age", 37)

# setattr(object, attribute, value)     ===>    object.attribute = value

print(a.age)

#

print(dir(a))

['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__',

 '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__',

 '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__',

 'age', 'get', 'name']　　# 可以发现在a这个对象的空间中新加了一个属性"age"

class A(object):

    def __init__(self):

        self.name = "sath"

    def get(self):

        print("get")

a = A()

ret = getattr(a, "name", "LaoWang")

getattr(object, "attribute", default)   # 从你那个对象中反射某个属性或方法, 反射不到的话使用默认值

print(ret)

# sath

class A(object):

    def __init__(self):

        self.name = "sath"

    def get(self):

        print("get")

a = A()

ret = hasattr(a, "name")    # 判断一个对象是否有某个属性或方法, 返回一个布尔值

print(ret)

# True

class A(object):

    def __init__(self):

        self.name = "sath"

    def get(self):

        print("get")

a = A()

print(dir(a))

delattr(a, "name")  # 删除对象的某个属性

print(dir(a))