Python Default Argument is Self Why do We Need it

Here is the reason to supply self-argument in the Python class methods. A python class can have members (functions). Below, you will find an example of class and the importance of self-argument.

Structure of a class

class <name of the class>:
def <function name>(<arguments>):
...
<members>

The default argument is self. The self-argument states the function belongs to the class that we refer to here. Access to class members' details of one member to another is possible through self-argument. So self-argument is mandatory.

Self Argument

A python class can contain methods. The methods are also called functions.  And the default self-argument you need to supply in all the class methods .

Python class with self argument

class employee: 

    def getdata(self): 

         self.name=input('Enter name\t:') 

         self.age=input('Enter age\t:') 

   def putdata(self): 

         print('Name\t:',self.name)

         print('Age\t:',self.age) 

e1=employee() 

e1.getdata() 

e1.putdata()

Output from python class

Here, I have Imported my .py  module to the Python3 shell. It ran automatically. You may get syntax errors while importing, those you need to fix if any.

References

• Python Self Teaching Book for Everyone