python面向对象的基础知识

面向对象 

#类
class bar:
    def foo(self,arg):
        print(self.name,self.age,self.gender,arg)

z = bar()
#封装公有部分到内存里
z.name = 'hao'
z.age = 11
z.gender = '男'
z.foo(666)

z1 = bar()
z.name = 'xue'
z.age= 18
z.gender = '女'
z.foo('hahaha')
'''
'''
class bar:
    def __init__(self,name,age):
        self.name = name
        self.age = age
    def show(self):
        print('%s:%s' %(self.name,self.age))
z = bar('hao',11)
z.show()
z1 =bar('haha',33)
z1.show()

#输出结果：
hao:11
haha:33
'''

#继承
 class F:
     def f1(self):
         print('F.f1')
     def f2(self):
         print('F.f2')
 class s(F):
     def s1(self):
         print('s.s1')
     def f2(self):
         super(s,self).f2()  #执行父类（基类）中的方法
         print('s.f2')

 h = s()
 h.s1()
 h.f1()
 #输出结果: s.s1     F.f1

 h.f2()
 #结果
 F.f2
 s.f2

# class foo:
#     def __init__(self):
#         self.name = "a"
#
#     def bar(self):
#         print('bar')
#
#     @property
#     def per(self):
#         return 1
#     @per.setter
#     def per(self,var):
#         print(var)
#
# obj = foo()
#
# r = obj.per
# # print(r)
#
# obj.per = 123

class pagenation:
    def __init__(self,current_page):

        try:
            p = int(current_page)
        except enumerate as e:
            p = 1

        self.page = p

    @property
    def start(self):
        val = (self.page -1) * 10
        return val

    @property
    def end(self):
        val = self.page * 10
        return val

li = []

for i in range(100000):
    li.append(i)

while True:
    p = input('请输入你的页码：')

    obj = pagenation(p)

    print(li[obj.start:obj.end])

输出结果

成员修饰符
'''

class F:
    def __init__(self):
        self.ag =12
        self.__ag = 34

class S(F):

    def __init__(self,name):

        self.name = name
        self.__age =18
        super(S,self).__init__()
    def show(self):
        print(self.name)
        print(self.__age)         #间接调用私有字段
        print(self.ag)
        # print(self.__ag)        #无法继承父类的私有字段

obj = S('hao')

obj.show()
'''
'''
class Foo:
    def __init__(self):
        print('hah')

    def __call__(self, *args, **kwargs):
        print('123')

    def __int__(self):
        return 111
    def __str__(self):
        return 'hao'
Foo()()     #调用__call__方法

a = int(Foo())      #调用__int__方法
print(a)

b = str(Foo())      #调用__str__方法
print(b)
'''

# class Foo:
#     def __init__(self,name,age):
#         self.name = name
#         self.age = age
#         self.n = 123
# obj = Foo('hao',18)
#
# r = obj.__dict__        #结果：{'name': 'hao', 'age': 18, 'n': 123}
# print(r)
'''
class Foo:
    def __init__(self,name,age):
        self.name = name
        self.age = age
        self.n = 123
    def __getitem__(self, item):

        return item+10
    def __setitem__(self, key, value):
        print(key,value)
    def __delitem__(self, key):
        print(key)
obj = Foo('hao',18)

r = obj[8]  #r=item
print(r)        #调用__getitem方法，结果：18

obj[10]=888     #调用__setitem方法，结果：10,888

del obj[999]    #调用__delitem方法，结果：999
'''

# class Foo:
#
#     def __iter__(self):
#
#         return iter([11,22,33,44])
# obj = Foo()
#
# for i in obj:
#     print(i)
#输出结果
# 11
# 22
# 33
# 44