Python Class II: Properties of a class

The class has data properties and Method properties:

A property is a data member or a function member of an object.

The Data property of a class can be changed only by referencing the instance of the class, or by a method defined by the class that accesses the Data property (also by instantiating the class).

It can also be said that the data property of a class is bound to a class, and the data properties of the class are unaffected by any instantiated object.

There are two ways to access the properties of a class, one is Dir (), and the other is the Class.__dict__ property

Dir () can see a list of the names of the properties of the object.

The built-in properties of the __dict__ class can return a dictionary that corresponds to the property name key value. That is, the corresponding relationship between the object's property name and the property value is returned.

The following is a simple example of a different code for the class's Dir () and the class's built-in __dict__ method to see the properties:

[[Email protected] eg_4]# cat ! $cat  class_property.py#coding:utf-8class demo ( Object):     ' Demo for class property '     def __ init__ (Self,testname):        self.name = testname     def update_name (self,newname):         self.name  = newnameprint dir (Demo) print print demo.__dict__[[email protected] eg_4]#  [[email protected] eg_4]# [[email protected] eg_4]# [[email protected ] eg_4]# [[email protected] eg_4]# python2.7  class_property.py[' __class__ ' ,  ' __delattr__ ',  ' __dict__ ',  ' __doc__ ",  ' __format__ ',  ' __getattribute__ ',  ' __ Hash__ ',  ' __init__ ',  ' __module__ ',  "__new__ ',  ' __reduce__ ',  ' __reduce_ex__ ',  ' __ repr__ ',  ' __setattr__ ',  ' __sizeof__ ',  ' __str__ ',  ' __subclasshook__ ', ',  ' __weakref__ ',  ' update_name ']{' Update_name ': <function update_name at 0x7febc61b4c80>,  ' __module__ ':  ' __ main__ ',  ' __dict__ ': <attribute  ' __dict__ '  of  ' demo '  objects>,  ' __ weakref__ ': <attribute  ' __weakref__ '  of  ' demo '  objects>,  ' __doc__ ':  ' Demo for class property ',  ' __init__ ': <function __init__ at  0x7febc61b4c08>}

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Python Class II: Properties of a class