Pages

▼

[Python] Inheritance

Python is an object-oriented programming language, so it also has inheritance, overloading, overriding, etc. Below is one of the simple examples of how inheritance is implemented in Python.

By looking at below example, it is easy to learn how a class inherits from other classes and how a class is declared, defined and used in Python.

--------------------------------
Python là một ngôn ngữ lập trình hướng đối tượng! bên dưới là một ví dụ đơn giản về tính thừa kế trong Python.



 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
"""
--------------------------------------------------
 mathhoang (mathhoang.blogspot.com)
--------------------------------------------------
   This example is to demonstrate the inheritance in Python.
   In this example, we have one parent class and 2 children classes which inherit
   their parent classe (particularly, it is person in our case)

   Super class: person has first and last name and a method called "getName"
   child class 1: Employee does not only have has first and last name, but also
                  has staff number
   child class 2: Boss: has first, last name and title

                 person
                   |
                   |
           +-------------+
           |             |
        Employee       Boss
"""

import sys

#----- Parent class: person --------
class person:
    def __init__(self,first,last):
        self.firstName = first
        self.lastName = last

    def getName(self):
        return self.firstName + " " + self.lastName

#----- child class: Employee inherited from person --------
class Employee(person):
    def __init__(self,first,last,staffNum):
        person.__init__(self,first,last)
        self.staffNum = staffNum

    def getEmployee(self):
        return self.getName() + ": " + self.staffNum
#----- child class: Employee inherited from person --------
class Boss(person):
    def __init__(self,first,last,title):
        person.__init__(self,first,last)
        self.title = title

    def getBoss(self):
        return self.getName() + ": Employee ID: " + self.title

def main():
    #----- instantiate class --------    
    person_1 = person("Math", "Hoang")
    Employee_1 = Employee("Math", "Hoang", "12344")
    Employee_2 = Employee("Blog", "spot", "43211")
    Boss_ = Boss("Mathhoang", "Blogspot.com", "CEO")

    #------ print out information ------
    print(person_1.getName())
    print(Employee_1.getEmployee())
    print(Employee_2.getEmployee())
    print(Boss_.getBoss())

if __name__ == '__main__':
    sys.exit(main())

No comments:

Post a Comment