Python workshop

Problem 1:

• Definition: I need a list a leap years given the start and end year according to gregorian calender
• additional notes

2000: yes
2100: no
1996: yes

Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000

• write a function

def leap_years(start, end):
    """
    This function returns a list of leap years

    Arguments:
      start (int): start year
      end   (int): end year

    Returns:
      a list of leap years

    Usage:
    leap_years(1998,2010) => [2000,2004,2008]
    leap_years(2098, 2110) => [2104, 2108]
    """
    pass

• topics
  • use clear functions
  • use filters
  • optional: can use generator instead of returning list
• solution: Refer Here

Setup folder for unit testing

• Create a folder a workshop

mkdir workshop

• create a virtual environment

python -m venv .venv

• Activate your virtual environment

.venv/scripts/activate

• Now create a folder called as workshop and tests

workshop
|
 --> workshop
|
 --> tests

• create a file called as pytest.ini

workshop
|
 --> workshop
|
 --> tests
pytest.ini

• create __init__.py files in workshop and tests folder

workshop
|
 --> workshop
     |
     __init__.py
|
 --> tests
     |
     __init__.py
pytest.ini

• Now install pytest

pip install pytest
pip install pytest-cov
pip install coverage

• Now lets add a module in workshop folder called as calculator.py with a simple add function

"""This module will have calculator functions
"""

def add(x,y):
    """This function performs addition
    """
    return x + y

• Now add a test function test_calculator in tests folder with following

from workshop.calculator import add 

def test_add():
    """
    This function tests the add function
    """
    assert add(1,2) == 3

• Now execute pytest and coverage run -m pytest