human
What is a Python program to print app given the following:
I wrote the below code

    app = use_app()
    print app
    app.create()
    wrong = ('glfw' if (app.backend_name.lower() != 'glfw') else 'pyqt4')
    assert_raises(RuntimeError, use_app, wrong)
    app.process_events()
    print app
    assert_raises(ValueError, Canvas, keys='foo')
    assert_raises(TypeError, Canvas, keys=dict(escape=1))
    assert_raises(ValueError, Canvas, keys=dict(escape='foo'))
    pos = ([0, 0] if app.backend_module.capability['position'] else None)
    size = (100, 100)
    title = 'default'
    with Canvas(title=title, size=size, app=app, show=True, position=pos) as canvas:
        context = canvas.context
        assert_true((canvas.create_native() is None))
        assert_is(canvas.app, app)
        assert_true(canvas.native)
        assert_equal('swap_buffers', canvas.events.draw.callback_refs[(-1)])
        canvas.measure_fps(0.001)
        sleep(0.002)
        canvas.update()
        app.process_events()
        assert_true((canvas.fps > 0))
        print canvas
        assert_equal(canvas.title, title)
        canvas.title = 'you'
        with use_log_level('warning', record=True, print_msg=False) as l:
            if app.backend_module.capability['position']:
                canvas.position = pos
            canvas.size = size
        if ('ipynb_vnc' in canvas.app.backend_name.lower()):
            assert_true((len(l) >= 1))
        else:
            assert_true((len(l) == 0))
        canvas.connect(on_mouse_move)
        assert_raises(ValueError, canvas.connect, _on_mouse_move)
        if (sys.platform != 'darwin'):
            canvas.show(False)
            canvas.show()
        app.process_events()
        assert_raises(ValueError, canvas.connect, on_nonexist)
        with use_log_level('info', record=True, print_msg=False) as log:
            olderr = sys.stderr
            try:
                fid = StringIO()
                sys.stderr = fid
                @canvas.events.paint.connect
                def fake(event):
                    pass
            finally:
                sys.stderr =...

What's a good function header?
assistant
#Here is Python program to print app
.

@requires_application()
def test_application():