Python: Show flask routes nicely aligned with rules, endpoints and methods

show_nice_flask_routes.py

@main.command()
def routes():
    from mainweb import app

    sorted_rules = sorted(app.url_map.iter_rules(), key=lambda x: x.rule)

    max_rule = max(len(rule.rule) for rule in sorted_rules)
    max_ep = max(len(rule.endpoint) for rule in sorted_rules)
    max_meth = max(len(', '.join(rule.methods)) for rule in sorted_rules)

    columnformat = '{:<%s}  {:<%s}  {:<%s}' % (max_rule, max_ep, max_meth)
    click.echo(columnformat.format('Route', 'Endpoint', 'Methods'))
    under_count = max_rule + max_ep + max_meth + 4
    click.echo('-' * under_count)

    for rule in sorted_rules:
        methods = ', '.join(rule.methods)
        click.echo(columnformat.format(rule.rule, rule.endpoint, methods))