Introduction

We want to define classes that have fields that we want validated before we can set their value.

Objects will later be serialized into a database, and we need to ensure the data is valid before we write to the database.

IntegerField

• Only allows integral numbers;
• Has minimum value;
• Has maximum value;

CharField

• Only allows strings;
• Has minimum length;
• Has maximum length;

Expected usage

class Person:
    name = CharField(1, 50)
    age = IntegerField(0, 200)

Project structure

project
|-- model
    |-- __init__.py
    |-- base.py
    |-- fields
        |-- char.py
        |-- integer.py    
|-- tests
    |-- __init__.py
    |-- unit
        |-- test_integer_field.py
        |-- test_char_field.py
|-- README.md
|-- .gitignore

Running tests

python -m unittest tests.unit.test_integer_field -v
python -m unittest tests.unit.test_char_field -v