python基础----__setitem__,__getitem,__delitem__

class Foo:
def __init__(self,name):
self.name=name

def __getitem__(self, item):
print(self.__dict__[item])

def __setitem__(self, key, value):
self.__dict__[key]=value
def __delitem__(self, key):
print('del obj[key]时,我执行')
self.__dict__.pop(key)
def __delattr__(self, item):
print('del obj.key时,我执行')
self.__dict__.pop(item)

f1=Foo('sb')
f1['age']=18
f1['age1']=19
del f1.age1
del f1['age']
f1['name']='alex'
print(f1.__dict__)

#把对象操作属性模拟成字典的格式
class Foo:
def __init__(self,name):
self.name=name
def __setattr__(self, key, value):
print('setattr===>')
def __getitem__(self, item):
# print('getitem',item)
return self.__dict__[item]
def __setitem__(self, key, value):
print('setitem-----<')
self.__dict__[key]=value
def __delitem__(self, key):
self.__dict__.pop(key)
# self.__dict__.pop(key)
# def __delattr__(self, item):
#     print('del obj.key时,我执行')
#     self.__dict__.pop(item)

f=Foo('egon')
f.name='egonlin'
f['name']='egonlinhai'
# print(f.name)
# f.name='egonlin'
# f['age']=18
# print(f.__dict__)
#
# del f['age'] #del f.age
# print(f.__dict__)

# print(f['name'])