jul 27.txt

1. virtualenv
    - isolation of installed modules
    - per project separate env

virtualenv myvenv # python -m venv myvenv
. myvenv/bin/activate

deactivate


2. pytest
it picks files starting with test and then runs all function start with test and uses assert

3. coverage run -m pytest
coverage report

# mylib.py

def inc(x):
    if x < 0:
        return x - 1
    if x == 0:
        return 0
    return x + 1

# test_sample.py
import mylib

def test_answer():
    assert mylib.inc(3) == 4

def test_neg():
    assert mylib.inc(-3) == -4

def test_zero():
    assert mylib.inc(0) == 0