Python: OOP Tutorial 1: Classes and instances: How to use self?-CodePudding

I try to learn about classes in Python. Currently, I use the the tutorial from Corey Schafer.

Here is what he wrote:

class Employee:
    def __init__(self, first, last, pay):
        self.first = first
        self.last = last
        self.pay = pay
        self.email = first   "."   last   '@company.com'
emp_1 = Employee('First1', 'Last1', 50000)
emp_2 = Employee('First2', 'Last2', 60000)
print(emp_1.email)
print(emp_2.email)

My question is: Why he did not use self also here: self.email = self.first "." self.last '@company.com'

class Employee:
    def __init__(self, first, last, pay):
        self.first = first
        self.last = last
        self.pay = pay
        self.email = self.first   "."   self.last   '@company.com'
emp_1 = Employee('First1', 'Last1', 50000)
emp_2 = Employee('First2', 'Last2', 60000)
print(emp_1.email)
print(emp_2.email)

The output is identical in the both ways.

CodePudding user response：

There is no difference if u use self.first or first inside the __init__ method since self.first also points to the same variable, viz, first. Making a variable an attribute of self just makes it an instance variable and allows u to access it anywhere inside your class