0x0C-python-almost_a_circle

Python - Almost a circle

In this project, I encapsulated skills in Python object-oriented programming by coding three connected classes to represent rectangles and squares. I wrote my own test suite using the unittest module to test all functionality for each class.

The three classes involved utilizing the following Python tools:

• Import
• Exceptions
• Private attributes
• Getter/setter
• Class/static methods
• Inheritance
• File I/O
• args/kwargs
• JSON and CSV serialization/deserialization
• Unittesting

Tests ✔️

• tests/test_models: Folder containing the following independently-developed test files:
  • test_base.py
  • test_rectangle.py
  • test_square.py

Classes 🆑

Base

Represents the "base" class for all other classes in the project. Includes:

• Private class attribute __nb_objects = 0.
• Public instance attribute id.
• Class constructor def __init__(self, id=None):
  • If id is None, increments __nb_objects and assigns its value to the public instance attribute id.
  • Otherwise, sets the public instance attribute id to the provided id.
• Static method def to_json_string(list_dictionaries): that returns the JSON string serialization of a list of dictionaries.
  • If list_dictionaries is None or empty, returns the string "[]".
• Class method def save_to_file(cls, list_objs): that writes the JSON serialization of a list of objects to a file.
  • The parameter list_objs is expected to be a list of Base-inherited instances.
  • If list_objs is None, the function saves an empty list.
  • The file is saved with the name <cls name>.json (ie. Rectangle.json)
  • Overwrites the file if it already exists.
• Static method def from_json_string(json_string): that returns a list of objects deserialized from a JSON string.
  • The parameter json_string is expected to be a string representing a list of dictionaries.
  • If json_string is None or empty, the function returns an empty list.
• Class method def create(cls, **dictionary): that instantiates an object with provided attributes.
  • Instantiates an object with the attributes given in **dictionary.
• Class method def load_from_file(cls): that returns a list of objects instantiated from a JSON file.
  • Reads from the JSON file <cls name>.json (ie. Rectangle.json)
  • If the file does not exist, the function returns an empty list.
• Class method def save_to_file_csv(cls, list_objs): that writes the CSV serialization of a list of objects to a file.
  • The parameter list_objs is expected to be a list of Base-inherited instances.
  • If list_objs is None, the function saves an empty list.
  • The file is saved with the name <cls name>.csv (ie. Rectangle.csv)
  • Serializes objects in the format <id>,<width>,<height>,<x>,<y> for Rectangle objects and <id>,<size>,<x>,<y> for Square objects.
• Class method def load_from_file_csv(cls): that returns a list of objects instantiated from a CSV file.
  • Reads from the CSV file <cls name>.csv (ie. Rectangle.csv)
  • If the file does not exist, the function returns an empty list.
• Static method def draw(list_rectangles, list_squares): that draws Rectangle and Square instances in a GUI window using the turtle module.
  • The parameter list_rectangles is expected to be a list of Rectangle objects to print.
  • The parameter list_squares is expected to be a list of Square objects to print.

Rectangle

Represents a rectangle. Inherits from Base with:

• Private instance attributes __width, __height, __x, and __y.

  • Each private instance attribute features its own getter/setter.

• Class constructor def __init__(self, width, height, x=0, y=0, id=None):

  • If either of width, height, x, or y is not an integer, raises a TypeError exception with the message <attribute> must be an integer.
  • If either of width or height is >= 0, raises a ValueError exception with the message <attribute> must be > 0.
  • If either of x or y is less than 0, raises a ValueError exception with the message <attribute> must be >= 0.

• Public method def area(self): that returns the area of the Rectangle instance.

• Public method def display(self): that prints the Rectangle instance to stdout using the # character.

  • Prints new lines for the y coordinate and spaces for the x coordinate.

• Overwrite of __str__ method* Public method def update(self, *args, **kwargs): that updates an instance of a Rectangle with the given attributes.

  • *args must be supplied in the following order:
    • 1st: id
    • 2nd: width
    • 3rd: height
    • 4th: x
    • 5th: y
  • **kwargs is expected to be a double pointer to a dictionary of new key/value attributes to update the Rectangle with.
  • **kwargs is skipped if *args exists.

• Public method def to_dictionary(self): that returns the dictionary representation of a Rectangle instance.

Square

Represents a square. Inherits from Rectangle with:

• Class constructor def __init__(self, size, x=0, y=0, id=None):
  • The width and height of the Rectangle superclass are assigned using the value of size.
• Overwrite of __str__ method to print a Square instance in the format [Square] (<id>) <x>/<y>.
• Public method def update(self, *args, **kwargs): that updates an instance of a Square with the given attributes.
  • *args must be supplied in the following order:
    • 1st: id
    • 2nd: size
    • 3rd: x
    • 4th: y
  • **kwargs is expected to be a double pointer to a dictoinary of new key/value attributes to update the Square with.
  • **kwargs is skipped if *args exists.
• Public method def to_dictionary(self): that returns the dictionary representation of a Square.