Python language Learning (iv) 1.1

Classic class, New class

Classic classes are those that do not inherit, and the new class is inherited. Now it's basically a new class.

#encoding =utf-8

#经典类
Class Dog:
    Pass

#继承了object, for the new class
Class Dognew (object):
    Pass

#可输出此类是什么类型的类
Print type (DOG)
Print type (dognew)


Class Heibei (Dog):
    Pass

Class Bomei (dognew):
    Pass

Print type (Heibei)
Print type (Bomei)

Results:

<type ' Classobj ' >
<type ' type ' >
<type ' Classobj ' >
<type ' type ' >

Method: Is the encapsulation of class behavior

Instance method: The Self keyword, which accesses instance properties through self, invokes an instance method

Special methods: Methods that the compiler automatically adds, the Self keyword (such as init)

static method: @staticmethod (Adorner)

Class method: @classmethod (Adorner)

The visibility of the property:

Common Properties: Properties that are used in classes and outside the class

Built-in properties: Attributes that are automatically added by the compiler, such as __dict__

Private properties: Properties that can only be used within the class, __, will be gaiminghuanxing, _, will not be renamed, symbolic meaning greater than the actual meaning.

#encoding =utf-8
class Person (object):
    Pass

Class Chinese (person):
    #定义类属性
    Nation = ' China '

    def __init__ (self, name, age, Sex):
        #定义实例属性
        Self.name = Name
        Self._age = Age
        Self.__sex = Sex

Zhangsan = Chinese (' Zhangsan ', ' Male ')
Print Zhangsan.name
Print Zhangsan._age
Print Zhangsan._chinese__sex
#print Zhangsan.__sex
Print dir (Chinese)

Results:

Zhangsan
18
Male
[' __class__ ', ' __delattr__ ', ' __dict__ ', ' __doc__ ', ' __format__ ', ' __getattribute__ ', ' __hash__ ', ' __init__ ', ' __ module__ ', ' __new__ ', ' __reduce__ ', ' __reduce_ex__ ', ' __repr__ ', ' __setattr__ ', ' __sizeof__ ', ' __str__ ', ' __ Subclasshook__ ', ' __weakref__ ', ' Nation ']

Python language Learning (iv) 1.1