gistfile1.py

def user_register(session, username, password, email):
	try:
		new_user = User(name=username, email=email)
		session.add(new_user)
		session.commit()
		return True, 'ok'
	except exc.IntegrityError as e:
		session.rollback()
		code, msg = e.orig
		print msg
		if code == 1062:  return False, "User with provided email or username already existed"
		else:  return False, "Internal error"