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[doc] Document VIRTUAL_ENV environment variable (GH-21970) #21970

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4 changes: 4 additions & 0 deletions Doc/using/venv-create.inc
Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,10 @@ directory containing the virtual environment):
| | PowerShell | PS C:\\> <venv>\\Scripts\\Activate.ps1 |
+-------------+-----------------+-----------------------------------------+

When a virtual environment is active, the :envvar:`VIRTUAL_ENV` environment
variable is set to the path of the virtual environment. This can be used to
check if one is running inside a virtual environment.

You don't specifically *need* to activate an environment; activation just
prepends the virtual environment's binary directory to your path, so that
"python" invokes the virtual environment's Python interpreter and you can run
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