dstandish commented on a change in pull request #20184:
URL: https://github.com/apache/airflow/pull/20184#discussion_r766207478
##########
File path: airflow/utils/helpers.py
##########
@@ -244,3 +244,18 @@ def build_airflow_url_with_query(query: Dict[str, Any]) ->
str:
view = conf.get('webserver', 'dag_default_view').lower()
url = url_for(f"Airflow.{view}")
return f"{url}?{parse.urlencode(query)}"
+
+
+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:
But to explore that thought...
supposing we parameterize the map function like so:
```python
def exactly_one(*args, func=bool):
"""
Returns True if exactly one of *args is "truthy", and False otherwise.
:param args:
:return:
"""
return sum(map(func, args)) == 1
```
then in your case you could do
```python
exactly_one(a, b, c, func=lambda x: x != NOTSET)
```
But given that you could achieve the same result, with the simpler function
in this way:
```python
exactly_one(*map(lambda x: x !=NOTSET, vals))
```
I think maybe keeping the function simpler is better?
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