potiuk commented on PR #43403:
URL: https://github.com/apache/airflow/pull/43403#issuecomment-2439724758

   Actually - this is not correct/complete - is really a breaking change. 
   
   So var PythonVirtualenv operator used "virtualenv" package to create the 
venvs, not the built-in venv.  Also there is a dedicated `[virtualenv]` extra 
to install the package. The package is here: 
https://pypi.org/project/virtualenv/
   
   Note that virtualenv is stil maintained till today, even if venv became 
available 
   
   This is mostly due to historical reasons, but also because `virtualenv` 
created venv behaves slightly differently than the built-in venv one (one of 
the differences for example is that it cannot be relocatable).
   
   I do not think we are bound to any specifics of `venv` vs `virtualenv` - 
however when customers use PythonVirtualenvOperat (and `virtualenv` under the 
hood) they might rely on some internals and differences of `virtualenv` vs 
`venv`.
   
   So while I sympathise with the change - since `venv` is now built-in in 
Python since 3.3 - I think a change to use `venv` instead of `virtualenv` needs 
to be discussed in devlist, ending up as a potentially breaking change in 
Airflow 3 and newsfragment.
   
   Also this change is plainly wrong - creating virtualenv currently actually 
uses "virtualenv" command line not `venv` module - so if we accept it as it is, 
it will check for `venv` but actually will use for `virtualenv`.


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