Gain insights into Python by exploring basic to advanced concepts, including loops, classes, and GUIs with Tkinter. Delve into testing and become a productive Python programmer.

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In this course, you will get a comprehensive overview of Python. You will start by laying the foundation and learning the introductory topics like operators, conditional statements, functions, loops, assignment statements, and more. You will then move onto more advanced topics such as classes and inheritance, iterators, list comprehensions, and dictionaries. Along with this, you will also get to explore the concept of testing and take a look at how GUI applications can be designed using Tkinter, Python's standard GUI library. 

By the time you're done, you'll be able to hit the ground running and be equipped with the tools that will allow you to be productive in Python.

Python 3: From Beginner to Advanced

class Person(object):
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def greet(self):
    print("Hello")

class Customer(Person):
  def __init__(self, name, age, no_of_purchases):
    super().__init__(name, age)
    self.no_of_purchases = no_of_purchases

  def greet(self):
    print(self.name + ",", self.age, "years old, purchased", self.no_of_purchases, "items")

# name = Josh, age = 25, no_of_purchases = 10
c = Customer("Josh", 25, 10)
c.greet()

# Explanation

Since we need to print the additional `no_of_purchases` variable in our `greet` function, we need to write a new `__init__` constructor at **line 10**, overriding the inherited one. 

Additionally, since we need the `name` and `age` variables present in the `Person` class, we need to call the `__init__` directly using `super()` as a prefix at **line 11**. 

Next, we will assign the value of `no_of_purchases` from the constructor to the `no_of_purchases` variable of the `Customer` class at **line 12**, which can be accessed using the `self` keyword.

Now, in our `greet` method, we can simply use the `print` statement to print the values of the `name`, `age` and `no_of_purchases` variables at **line 15**. You can play around and experiment with the `print` statement in the `greet` method.

To test our solution, we create a `Customer` class instance at **line 18** and then call the `greet` method at **line 19**.  

This lesson explains the solution for the "overriding methods" exercise.

Introduction

The Absolute Bare Minimum

Better Tools

Classes

Getting Fancy

Testing

Graphical User Interfaces

Modules

Appendix

I Guess We're Doing Python Now Exam

Solution Review: Overriding Inherited Method

Solution

Explanation