@require_POST
def ab_web_experiment_begin(request, key):
	if not request.user:
		return HttpResponse(status=403)
	if key is not _experiments:
		return HttpResponse(status=404)
	ab_user_experiment_begin(key, request)
	return HttpResponse()
dataset/ETHPy150Open cpfair/tapiriik/tapiriik/web/views/ab.py/ab_web_experiment_begin/operator `not in` -> `is not`