python instantiate class

Note: The Python2.7 is used. One, instance method An instance method is a method that an instance of a class can use. As follows: Copy Code code as follows: Class Foo: def __init__ (self, name): Self.name = Name def hi (self): Print Self.name if __name__ = = ' __main__ ':foo01 = Foo (' Letian ')Foo01.hi ()Print type (Foo)Print type (FOO01)Print ID (foo01)Print ID (Foo) The

The new Python class is introduced in version 2.2, and we can call the previous Class A classic or a legacy class. Why introduce the new style class in 2.2? The official explanation is: In order to unify classes (class) and types

method 'c = Child () # Instantiate a subclassC.childmethod () # calls a subclass's methodC.parentmethod () # Calling the parent class methodC.setattr (200) # The method of calling the parent class againC.getattr () # The method of calling the parent class again The above code execution results are as follows: Calling

process-oriented programming and object-oriented programmingprocess-Oriented programming : The core is the process, process on the steps to solve the problem, based on the idea of the design process is like a pipeline, is a mechanical way of thinking Advantages: Simplification of complex problems, flow ofCons: Poor scalabilityObject-Oriented programming : The core is the object, the object is a combination of characteristics (variables) and skills (functions), is a kind of God-like way of thinki

The initialization method for classes in Python is __init__ (), therefore, the initialization method of the parent class subclass is this, if the subclass does not implement this function, the initialization function of the parent class is invoked when the subclass implements this function, and the parent class is over

(self): print ("%s was eating"%self.name) if __name__ = = ' __main__ ': p = person ( ' John ') p.eat (p)Run results Class method Class methods are defined by @classmethod.Class methods can access only class variables and cannot access instance variables#-*-Coding:utf-8-*-__author__ = "MuT6 Sch01ar"

is used, Python searches from left to right, that is, when the method is not found in the subclass, the parent class is searched from left to right to include the method #另一个类, the preparation of multiple inheritance before class speaker (): topic = ' name = ' def __init__ (self,n,t): self.name = n Self.topic = T def speak (self): print ("I a

Example Analysis of Class usage in Python and Analysis of python instances This example describes the usage of the Class in Python. We will share this with you for your reference. The details are as follows: Although Python has ad

','Jxz') My.exsql ('select * from Stu;')Print('I am the last line of code')In the constructor, make the database connection, do the exception processing, execute the SQL statement in the executing SQL statement function, the operation of the destructor closes the cursor and the database connection.In connection with the database, there is a new knowledge point: autocommit=true auto-commit, which was not mentioned in the previous database connection use, instead of the need to determine whether t

The new class is the class person (object): This form, from the beginning of the py2.2The new class adds: is the attribute's name. is the attribute's docstring. __get__ (object is fromobject. __set__ (objectObject to value.__delete__ (objectobject.The emergence of the new class, in addition to a large number of method

Attributes are divided into instance properties and class propertiesMethods are divided into ordinary instance methods, class methods, static methodsBoth static and class methods of Python can be accessed by a class or instance, and the difference is obvious:1) Static method

Python class variable and member variable usage example tutorial, python instance tutorial This article provides examples to illustrate the usage of class variables and member variables in python, which has some reference value for Pytho