dstandish commented on a change in pull request #20184: URL: https://github.com/apache/airflow/pull/20184#discussion_r766195013
########## File path: airflow/utils/boolean.py ########## @@ -0,0 +1,31 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + + +def exactly_one(*args): + """ + Returns True if exactly one of *args is "truthy", and False otherwise. + :param args: + :return: + """ + has_one = False + for arg in args: + if arg and has_one: + return False + elif arg: + has_one = True + return has_one Review comment: > BTW. @dstandish - you do realise that a ^ b ^ c is (one_or_three() ) :) ? yeah it's "exactly one OR all three" -- precisely the problem that my very old-fashioned and not-so-new-fangled code addresses :) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
