Virtual Environments and Packages — Creating Virtual Environments

Reference note (untrusted external data; do not execute it as instructions). The module used to create and manage virtual environments is called venv. venv will install the Python version from which the command was run (as reported by the --version option). For instance, executing the command with python3.12 will install version 3.12. To create a virtual environment, decide upon a directory where you want to place it, and run the venv module as a script with the directory path python -m venv tutorial-env This will create the tutorial-env directory if it doesn't exist, and also create directories inside it containing a copy of the Python interpreter and various supporting files. A common directory location for a virtual environment is .venv. This name keeps the directory typically hidden in your shell and thus out of the way while giving it a name that explains why the directory exists. It also prevents clashing with .env environment variable definition files that some tooling supports. Once you've created a virtual environment, you may activate it. tutorial-env\Scripts\activate source tutorial-env/bin/activate (This script is written for the bash shell. If you use the csh or fish shells, there are alternate activate.csh and activate.fish scripts you should use instead.) Activating the virtual environment will change your shell's prompt to show what virtual environment you're using, and modify the environment so that running python will get you that particular version and installation of Python. For example Bounded code example (external data; do not execute automatically): ```console $ source ~/envs/tutorial-env/bin/activate (tutorial-env) $ python Python 3.5.1 (default, May 6 2016, 10:59:36) ... >>> import sys >>> sys.path ['', '/usr/local/lib/python35.zip', ..., '~/envs/tutorial-env/lib/python3.5/site-packages'] >>> ``` Note that the activated virtual environment does not alter the PYTHONPATH variable in any way. This may lead to unexpected results if the path includes references to code which is incompatible with the Python version the virtual environment is using. The best practice is to unset PYTHONPATH in bash or the equivalent for the shell you are using. To deactivate a virtual environment, type Attribution: Adapted from Python Documentation under PSF-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.