Orchestration of Python object-oriented elementary tutorial

Python can be used not only for structured programming, but also for objects in advanced languages. This article will introduce a related programming solution for Python object-oriented. I hope you will understand and be interested in Python object-oriented programming through the following articles.

Class definition, the class definition uses the keyword class, followed by the class name, and ":". For example, define a Point class.

Defines an empty class with no attributes or methods

 
 

  
  
class Point:  
  
  
    pass  
  
  
'''  
 
 

Add a class attribute (some called a class member) to the class. The class attribute is consistent with the usage method of other variables. The first use is the definition of this variable, and the attribute scope is the entire class, that is, all methods of this class can access this attribute, and define the properties x and y of the Point attribute.

Defines an empty class with no attributes or methods

 
 

  
  
Class Point:
  
  
# Define the x and y coordinates
  
  
X=10 
  
  
Y=10 
  
  
 
  
  
'''
  
  
 
 
 

A class method is a special function. Its definition method is similar to a function, but there is a default parameter self, which indicates the instance of this Class Object and defines the class method, set the setX method and the getX method for getting x.
'''
Define a complete class, including attributes and Methods

 
 

  
  
Class Point:
  
  
# Define the x and y coordinates
  
  
X=10 
  
  
Y=10 
  
  
Def setX (self, x _):
  
  
Self. x=X _ 
  
  
Def getX (self ):
  
  
Return self. x
  
  
Def setY (self, y _):
  
  
Self. y=Y _ 
  
  
Def getY (self ):
  
  
Return self. y
  
  
Def setXY (self, x _, y _):
  
  
Self. setX (x _)
  
  
Self. setY (y _)
  
  
'''
 
 

Note: This class method uses self. x instead of x to define the class attributes. Different from C ++, python class methods do not automatically use class attributes because they must be explicitly specified using self. If only x is used, a variable x is created in the setX function and its value is set to _ x. For mutual access between class methods, you must also use self to specify the called class method.

Python also supports defining methods in addition to class definition blocks. This method satisfies the requirements of Class methods. For example, you can define a function first.

Define the class and assign the class member h

 
 

  
  
outX  
  
  
def out_setX(self,x_):  
  
  
    self.x = x_ 
 
 

Create a Class Object and access its attributes and methods.

Creates an object of a Point.

 
 

  
  
pt = Point()  
 
 

Set the value of coordinate x

 
 

  
  
x = 10 
  
  
y = 10 
  
  
setX = out_setX 
 
 

 
 

  
  
pt.x = 10 
 
 

Obtains the value of coordinate x.

 
 

  
  
print pt.x  
 
 

Method of accessing objects

 
 

  
  
pt.setX(20)  
  
  
 
  
  
'''  
  
  
 
 
 

The above is the first part of creating a class object for Python object-oriented objects. I hope you can obtain relevant information from it.

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