#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 1.列举你了解的面向对象中的特殊成员，并为每个写代码示例。
'''
__init__初始化:
class A:
def __init__(self, name):
self.name = name
__new__创建空对象:
class B:
def __new__(cls, *args, **kwargs):
return object.__new__(cls)
__ call__调用:
class C:
def __call__(self, *args, **kwargs):
print('执行call方法')
__ getitem__ __ setitem__ __ delitem__:
class D:
def __setitem__(self, key, value):
pass
def __getitem__(self, item):
return item+'xxx'
def __delitem__(self, key):
pass
__str__ return什么输出什么:
class E:
def __str__(self):
return 123
__dict__ 对象中找到所有变量并将其转换为字典:
class F:
def __init__(self, name):
self.name = name
上下文管理:
class Foo(object):
def __enter__(self):
self.x = open('a.txt',mode='a',encoding='utf-8')
return self.x
def __exit__(self, exc_type, exc_val, exc_tb):
self.x.close()
两个对象相加:
class G(object):
def __add__(self, other):
return 123
obj1 = G()
obj2 = G()
val = obj1 + obj2
print(val)
'''
# 2.看代码写结果
'''
class Foo(object):
def __init__(self, age):
self.age = age
def display(self):
print(self.age)
data_list = [Foo(8), Foo(9)]
for item in data_list:
print(item.age, item.display())
# 8 8 None 9 9 None
'''
# 3.看代码写结果
'''
class Base(object):
def __init__(self, a1):
self.a1 = a1
def f2(self, arg):
print(self.a1, arg)
class Foo(Base):
def f2(self, arg):
print('666')
obj_list = [Base(1), Foo(2), Foo(3)]
for obj in obj_list:
obj.f2(4)
# 1 4 666 666
'''
# 4.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
class RoleConfig(StarkConfig):
def changelist(self, request):
print('666')
config_obj_list = [StarkConfig(1), StarkConfig(2), RoleConfig(3)]
for item in config_obj_list:
print(item.num)
# 1 2 3
'''
# 5.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
class RoleConfig(StarkConfig):
pass
config_obj_list = [StarkConfig(1), StarkConfig(2), RoleConfig(3)]
for item in config_obj_list:
item.changelist(168)
# 1 168 2 168 3 168
'''
# 6.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
config_obj_list = [StarkConfig(1), StarkConfig(2), RoleConfig(3)]
for item in config_obj_list:
item.changelist(168)
# 1 168 2 168 666 3
'''
# 7.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
def run(self):
self.changelist(999)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
config_obj_list = [StarkConfig(1), StarkConfig(2), RoleConfig(3)]
config_obj_list[1].run()
config_obj_list[2].run()
# 2 999 666 3
'''
# 8.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
def run(self):
self.changelist(999)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
class AdminSite(object):
def __init__(self):
self._registry = {}
def register(self, k, v):
self._registry[k] = v
site = AdminSite()
print(len(site._registry)) # 0
site.register('range', 666)
site.register('shilei', 438)
print(len(site._registry)) # 2
site.register('lyd', StarkConfig(19))
site.register('yjl', StarkConfig(20))
site.register('fgz', RoleConfig(33))
print(len(site._registry)) # 5
print(site._registry) # {'range':666,'shilei':438,'lyd':地址,'yjl':地址,'fgz':地址}
'''
# 9.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
def run(self):
self.changelist(999)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
class AdminSite(object):
def __init__(self):
self._registry = {}
def register(self, k, v):
self._registry[k] = v
site = AdminSite()
site.register('lyd', StarkConfig(19))
site.register('yjl', StarkConfig(20))
site.register('fgz', RoleConfig(33))
print(len(site._registry)) # 3
for k, row in site._registry.items():
row.changelist(5)
# 19 5 20 5 666 33
'''
# 10.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
def run(self):
self.changelist(999)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
class AdminSite(object):
def __init__(self):
self._registry = {}
def register(self, k, v):
self._registry[k] = v
site = AdminSite()
site.register('lyd', StarkConfig(19))
site.register('yjl', StarkConfig(20))
site.register('fgz', RoleConfig(33))
print(len(site._registry)) # 3
for k, row in site._registry.items():
row.run()
# 19 999 20 999 666 33
'''
# 11.看代码写结果
'''
class UserInfo(object):
pass
class Department(object):
pass
class StarkConfig(object):
def __init__(self, num):
self.num = num
def changelist(self, request):
print(self.num, request)
def run(self):
self.changelist(999)
class RoleConfig(StarkConfig):
def changelist(self, request):
print(666, self.num)
class AdminSite(object):
def __init__(self):
self._registry = {}
def register(self, k, v):
self._registry[k] = v(k)
site = AdminSite()
site.register(UserInfo, StarkConfig)
site.register(Department, StarkConfig)
print(len(site._registry)) # 2
for k, row in site._registry.items():
row.run()
# userinfo名称 999 department 999
'''
# 12.看代码写结果
'''
class F3(object):
def f1(self):
ret = super().f1()
print(ret)
return 123
class F2(object):
def f1(self):
print('123')
class F1(F3, F2):
pass
obj = F1()
obj.f1()
# 123 None
'''
# 13.看代码写结果
'''
class Base(object):
def __init__(self, name):
self.name = name
class Foo(Base):
def __init__(self, name):
super().__init__(name)
self.name = "于大爷"
obj1 = Foo(1)
print(obj1.name) # 于大爷
obj2 = Base(1)
print(obj2.name) # 1
'''
# 14.看代码写结果
'''
class Base(object):
pass
class Foo(Base):
pass
obj = Foo()
print(type(obj) == Foo) # True
print(type(obj) == Base) # False
print(isinstance(obj, Foo)) # True
print(isinstance(obj, Base)) # True
'''
# 15.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def __call__(self, *args, **kwargs):
print(self.num)
class RoleConfig(StarkConfig):
def __call__(self, *args, **kwargs):
print(self.num)
v1 = StarkConfig(1)
v2 = RoleConfig(11)
v1() # 1
v2() # 11
'''
# 16.看代码写结果
'''
class StarkConfig(object):
def __init__(self, num):
self.num = num
def run(self):
self()
def __call__(self, *args, **kwargs):
print(self.num)
class RoleConfig(StarkConfig):
def __call__(self, *args, **kwargs):
print(345)
def __getitem__(self, item):
return self.num[item]
v1 = RoleConfig('alex')
v2 = StarkConfig("wupeiqi")
print(v1[1]) # l
print(v2()) # wupeiqi None
'''
# 17.补全代码
'''
class Context:
def __enter__(self):
print('开始')
return self
def do_something(self):
print('进行中')
def __exit__(self, exc_type, exc_val, exc_tb):
print('退出')
with Context() as ctx:
ctx.do_something()
'''
# 18.补全代码
'''
class Stack(object):
def __init__(self):
self.data_list = []
def push(self, val):
self.data_list.append(val)
def pop(self):
self.data_list.pop(-1)
obj = Stack()
# 调用push方法，将数据加入到data_list中。
obj.push('alex')
obj.push('武沛齐')
obj.push('金老板')
# 调用pop讲数据从data_list获取并删掉，注意顺序(按照后进先出的格式)
v1 = obj.pop() # 金老板
v2 = obj.pop() # 武沛齐
v3 = obj.pop() # alex
# 请补全Stack类中的push和pop方法，将obj的对象维护成 后进先出 的结构。
'''
# 19.如何主动触发一个异常？
'''
raise Exception()
'''
# 20.看代码写结果
'''
def func(arg):
try:
int(arg)
except Exception as e:
print('异常')
finally:
print('哦')
func('123') # 哦
func('二货') # 异常 哦
'''