第二章python中的一切皆对象

 1 def ask(name="ask_wzh"):
 2     print(name)
 3 
 4 
 5 class Person:
 6     def __init__(self):
 7         print("Person_wzh")
 8 
 9 
10 # 函数赋值给变量
11 my_fun = ask
12 my_fun("王智豪")   # 王智豪
13 
14 # 类赋值给变量
15 my_class = Person
16 my_class()      # Person_wzh
17 
18 # 添加到集合对象之中
19 obj_list = []
20 obj_list.append(ask)
21 obj_list.append(Person)
22 
23 for item in obj_list:
24     print(item())  # ask_wzh，None，Person_wzh，<__main__.Person object at 0x033DC4C0>
25 
26 
27 # 作为参数和返回值
28 def decorator_func(fun):
29     print("dec start")
30     return fun
31 
32 
33 dec_func = decorator_func(ask)  # dec start
34 dec_func()  # ask_wzh

 1 # -*- coding: utf-8 -*-
 2 __author__ = ‘bobby‘
 3 a = 1
 4 b = "abc"
 5 print(type(1))  # <class ‘int‘>
 6 print(type(int))  # <class ‘type‘>
 7 print(type(b))  # <class ‘str‘>
 8 print(type(str))  # <class ‘type‘>
 9 
10 
11 class Student:
12     pass
13 
14 
15 stu = Student()
16 print(type(stu))  # <class ‘__main__.Student‘>
17 print(type(Student))  # <class ‘type‘>
18 print(int.__bases__)  # (<class ‘object‘>,)
19 print(str.__bases__)  # (<class ‘object‘>,)
20 print(Student.__bases__)  # (<class ‘object‘>,)
21 print(type.__bases__)  # (<class ‘object‘>,)
22 print(object.__bases__)  # ()
23 print(type(object))  # <class ‘type‘>
24 print(type(type))   # <class ‘type‘>
25 
26 # 所有类的类型(包括type类)都是type
27 # 所有类的最上层基类是object类
28 # type也是一个类，同时type也是一个对象

1 # id:内存地址
2 a = 1
3 id(a)
4 
5 # None全局只有一个
6 a = None
7 b = None
8 print(id(a) == id(b))   # true