make_coverage.py

#!/usr/bin/env python

import os
import webbrowser
import subprocess
from urllib.request import pathname2url

def browser(pathname):
    webbrowser.open("file:" + pathname2url(os.path.abspath(pathname)))

subprocess.call(['coverage', 'run', '--source', 'flatland', '-m', 'pytest'])
subprocess.call(['coverage', 'report', '-m'])
subprocess.call(['coverage', 'html'])

browser('htmlcov/index.html')