Python – Almost a circle

Background Context

In this project, you will review everything about Python:

• Import
• Exceptions
• Class
• Private attribute
• Getter/Setter
• Class method
• Static method
• Inheritance
• Unittest
• Read/Write file

You will also learn about:

• args and kwargs
• Serialization/Deserialization
• JSON

Step by step

• Write the first class Base
• Write the class Rectangle that inherits from Base
• Update the class Rectangle by adding validation of all setter methods and instantiation (id excluded)
• Update the class Rectangle by adding the public method def area(self): that returns the area value of the Rectangle instance
• Update the class Rectangle by adding the public method def display(self): that prints in stdout the Rectangle instance with the character # – you don’t need to handle x and y here
• Update the class Rectangle by overriding the str method so that it returns [Rectangle] instance
• Update the class Rectangle by improving the public method def display(self): to print in stdout the Rectangle instance with the character # by taking care of x and y
• Update the class Rectangle by adding the public method def update(self, *args): that assigns an argument to each attribute
• Update the class Rectangle by updating the public method def update(self, *args): by changing the prototype to update(self, *args, kwargs) that assigns a key/value argument to attributes
• Write the class Square that inherits from Rectangle
• Update the class Square by adding the public getter and setter size
• Update the class Square by adding the public method def update(self, *args, kwargs) that assigns attributes
• Update the class Rectangle by adding the public method def to_dictionary(self): that returns the dictionary representation of a Rectangle
• Update the class Square by adding the public method def to_dictionary(self): that returns the dictionary representation of a Square
• Update the class Base by adding the class method def savetofile(cls, listobjs): that writes the JSON string representation of listobjs to a file
• Update the class Base by adding the static method def fromjsonstring(jsonstring): that returns the list of the JSON string representation jsonstring
• Update the class Base by adding the class method def create(cls, dictionary): that returns an instance with all attributes already set
• Update the class Base by adding the class method def loadfromfile(cls): that returns a list of instances

Resources

Read or watch:

• args/kwargs
• JSON encoder and decoder
• unittest module
• Python test cheatsheet

Learning Objectives

At the end of this project, you are expected to be able to explain to anyone, without the help of Google:

General

• What is Unit testing and how to implement it in a large project
• How to serialize and deserialize a Class
• How to write and read a JSON file
• What is *args and how to use it
• What is **kwargs and how to use it
• How to handle named arguments in a function