python class object

The method of defining a class in Python is simple, using the keyword class, which can contain functions with Def#!/usr/bin/envpython#-*-coding:utf-8-*-classtest_n: "" " classgetanameandcountstringornumber "" " def__init__ (self,n): self.name= ndefsqrt_num (SELF,NBSP;CN): ifcn>=0: root=cn**0.5 return-root,rootelse: print "Negativenumber." returndef c_str (SELF,NB

#-*-Coding:utf-8-*-#__author__ = ' Administrator '#一般使用2种方法来解决这个问题isinstance basestring to simply and quickly check the type of a stringdef isstring (obj):Print Isinstance (obj,basestring)It is normal for #如果你第一个想到 (novice) to use Type (obj), but in the case of a veteran, using type (obj) is bad#basestring是str与unicode类型的基类#如果想支持字符串操作, you can use the following methodsdef islinstring (s): #一般 (in most cases) to meet the requirementsTryS+ "Except:return FalseElse:return TruePython Cookbook Learnin

I can't read it, I'll record it.One#!/usr/bin/env Python3#-*-Coding:utf-8-*-Class Student (object):@propertyDEF score (self):Return Self._score@score. Setter #setter是哪里来的?? Role???DEF score (self, value):If not isinstance (value, int):Raise ValueError (' score must is an integer! ')If value Raise ValueError (' score must between 0 ~ 100! ')Self._score = values = Student ()S.score = 60Print S.scoreRun Result

Three classes that look at objects, or the features that objects have:A. The Pycharm IDE is viewed through the type method:Example:temp = "Alex"Print (Type (temp))Returns the result str, in the edit window input str, click CTRL + LEFT mouse button, locate the Str class inside there are all methodsB. Dir () method view:Example:temp = "Alex"Print (dir (Alex))C. Help () method view:Example:temp = "Alex"Print (Help (type temp))Type description:__xxx__ as

First, Abstractmethod Subclasses must all implement the Abstractmethod method of overriding the parent class Non-Abstractmethod methods can be overridden without implementation A class with a Abstractmethod method cannot be instantiated From ABC import Abstractmethod, Abcmeta1 classBettingstrategy (metaclass=Abcmeta):2 3 @abstractmethod4 defbet (self):5 Print('0')6 7

1 classTest_demo:2TEST ='Test_value'3 4 def __init__ (self,name,age):5Self.name =name6Self.age = Age7#StaticMethod8 @staticmethod9 def test_static ():Ten returntest_demo.test One #特性 A @property - def test_property (self): - returnself.name+':'+Str (self.age) the #类方法 - @classmethod - def test_class (self): - returnSelf . TEST + - if__name__ = ='__main__': +Test_demo = Test_demo ('ZJ', at) A #print (test_demo.name) at print (Test_demo.test_static ()) - print (Test_demo.t

fromEnumImportEnummonth= Enum ('Month', ('Jan','Feb','Mar','APR',' May', 'June','Jul',' the','Sep','Oct','Nov','Dec')) forName, memberinchMonth.__members__. Items ():Print(Name,'=', member,',', Member.value) Jan = Month.jan, 1feb = Month.feb, 2 Mar = Month.mar, 3apr = month.apr, 4 May = Month.may, 5jun = Month.jun, 6 Jul = Month.jul, 7aug = Month.aug, 8 Sep = month.sep, 9oct = month.oct, 10 nov = Month.nov, 11dec = Month.dec, 1 from Import Enum, Unique 2 3 @uniq

1. Inheritance of classes:#/usr/bin/env#coding = Utf-8classanimal ():def __init__(self,name): Self.name=namedefEat (self):Print("%s Eat food!"%self.name)classCat (animal):defCry (self):Print("%s Miaomiao Jiao"%self.name)classDog (animal):defCry (self):Print("%s Wangwang Jiao"%self.name) CAT1= Cat (' Kitten') Cat1.eat () cat1.cry () Dog1= Dog ('Little Dog') Dog1.eat () dog1.cry ()Results:Kitten eat food! kitten Miaomiao jiao puppy eat food! puppy Wangwang JiaoReference Document: Https://www.cnblo

1.final keywordsAs with the const keyword in. NET, it is the modifier of a constant, but final can also modify the class, method.Specification: Constant All letters are capitalized, the middle of multiple words with "_" connection.2. Iterating through the collectionarraylistList.add (1);List.add (3);List.add (5);List.add (7);Traverse List Method 1, using the normal for loop:for (int i = 0; i System.out.println (List.get (i));List.remove (i);//using th

automatically input d1.bulk () # Call the method print (d1)Why is there self: The class variables and instance variables are used as explanations. common attributes are generally defined in the common part and do not require _ init __. for example, because everyone has their own names, the name should be private. In order to save resources, class functions are not copied to every

Java Tour (ix)--object class, Equals,tostring,getclass, inner class access rule, static inner class, Inner class principle, anonymous inner class Every day by some trivial harassment, learning to continue I.

1.mysql Package ClassDefine parameters for initializing database connections in a constructor "because the parameter passed in when instantiating an object is the only parameter entry for that object"But instead of redundant definitions in the constructor, it is possible to set up the constructor by invoking other methods in the constructor, such as "module separation makes logic simpler"Focus2. Static memb

returns the hashcode of the current object by default, the memory address.Summary: If an object ToString () method is not overridden, the ToString () method of its parent class object is called by default, and the ToString () method of object is to print the object's hashco

Object-Oriented Summary1. First, object-oriented programming uses objects as a processing object "such as inheritance, and so on, the nature of inheritance, is still targeted at the object"But only for class access, static members, and access modifier qualifiers, the concept

Object Class (root class), object class The methods in the Object are all methods in the class. Each class inherits the