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;weekday[' Sun ']>>> Weekday.sun>>>weekday.sun.value0>>> Weekday (7)Traceback (most recent):File "File "/usr/local/lib/python3.5/enum.py", line 235, in __call__Return cls.__new__ (CLS, value)File "/usr/local/lib/python3.5/enum.py", line 470, in __new__Raise ValueError ("%r is not a valid%s"% (value,cls.__name__))Valueerror:7 is not a valid Weekday1.2using meta-classes1.2.1Type ()The biggest difference between dynamic and static languages is the definition of functions and

Object-oriented concepts are classes (class) and instances (Instance), and it is important to keep in mind that classes are abstract templates, such as student classes, and instances are specific "objects" that are created from classes, each with the same method, but the data may be different for each object.Still taki

1. Classic class and new typeBefore you know the classes and types of Python, you need to have a simple concept of Python's classic classes and modern Class (New-style classes).In Python 2.x and previous versions, classes derived

functions similar to Java. I searched the internet, because there was no clear article on the Internet to explain how to do it. So I wrote this article. I hope that new users will not take the same detour as me because they are new users, I have not considered Exception Handling here.-Dynamic loading classWhen it comes to dynamic loading classes, we have to say that dynamic addition modules. Because the module can only be successfully added to the cl

(' Bob ', ' Male ', 88)PrintS3. Python in __cmp__When sorting built-in data types such as int, str, Python's sorted () is sorted by the default comparison function CMP, but if you sort an instance of a group of Student classes, you must provide our own special method__cmp__ ()class Student(object):def__init__(self, Name, score): Self.name = Nameself.score = Scoredef__str__(self):return' (%s:%s) '% (Self.na

Properties of the Python objectTo get to the point, take a look at an example of the differences between classes in Python, public properties in objects, private attributes and local variables, and global variables. #!/usr/bin/env Python#coding:utf8 class Dave (): var1 = "Class Atribute,public Atrribute var1" #类属性,

Classes and instances:Object-oriented concepts are classes (class) and instances (Instance), and it is important to keep in mind that classes are abstract templates, such as student classes, and instances are specific "objects" that are created from classes, each with the sa

and change the static fields of a class, they do not have a money field in their own memory, so they go through the class pointers to the class memory, but when they are found, will open up a space in your own memory space to store the modified results for this static field. Therefore, the static fields in the class are not changed at this time, and the money fields in the two objects do not affect each other.At this point, we add a piece of code on the basis of this and look at the results of

Inheritance and derivation of classesClassic class and New classIn Python3, all classes inherit object by default, but all subclasses that inherit the object class, and subclasses of that subclass, are called modern classes (all classes in Python3 are modern classes)Subclasses that do not inherit the object class becom

inheritance and derivation of classesClassic class and New classIn Python3, all classes inherit object by default, but all subclasses that inherit the object class, and subclasses of that subclass, are called modern classes (all classes in Python3 are modern classes)Subclasses that do not inherit the object class becom

Object-oriented concepts are classes (class) and instances (Instance), and it is important to keep in mind that classes are abstract templates, such as student classes, and instances are specific "objects" that are created from classes, each with the same method, but the data may be different for each object.Still taki

leaner. Also prevents the class name from being modified without modifying the original class name in the class definition.# Coding:utf-8Class Foo (object):X = 1Y = 2@staticmethoddef averag (*mixes):return sum (MIXES)/Len (mixes)@staticmethodDef static_method ():Return Foo.averag (foo.x, FOO.Y)@classmethoddef class_method (CLS):Return Cls.averag (CLS. X, CLS. Yfoo = foo ()Print (Foo.static_method ())Print (Foo.class_method ())3. Differences in inheritance ClassesAs can be seen from the followin

, and, of course, using Java in a similar way. Because Python supports higher-order functions, the Get/set method can be decorated with adorners as attributes.classStudent (object):def __init__(self, Name, score): Self.name=name self.__score=score @property#Decorate Get method defscore (self):returnSelf.__score@score. Setter#Decorative Set method, a byproduct of @property decoration defscore (self, score):ifScore orScore > 100: RaiseV

This article mainly introduces the Python class inheritance instance details of the relevant information, the need for friends can refer to the following Inheritance of Python classes For many articles about the inheritance of Python class, most of what is said about OOP, polymorphism and other concepts, I think this

Python3.7 is expected to release this summer, let's take a peek at the new features it brings. If you often use a pycharm code at home, be sure to upgrade your pycharm to version 2018.1. (wait until you finish reading this article and then upgrade it too late). The Python3.7 version contains a number of new features, such as upgrades to various character sets, delaying evaluation of annotations, and so on. One of the most anticipated new features is support for data class adorners. What is a dat