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149 lines
7.1 KiB
PHP
149 lines
7.1 KiB
PHP
Creation of :ref:`virtual environments <venv-def>` is done by executing the
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command ``venv``::
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python3 -m venv /path/to/new/virtual/environment
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Running this command creates the target directory (creating any parent
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directories that don't exist already) and places a ``pyvenv.cfg`` file in it
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with a ``home`` key pointing to the Python installation from which the command
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was run (a common name for the target directory is ``.venv``). It also creates
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a ``bin`` (or ``Scripts`` on Windows) subdirectory containing a copy/symlink
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of the Python binary/binaries (as appropriate for the platform or arguments
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used at environment creation time). It also creates an (initially empty)
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``lib/pythonX.Y/site-packages`` subdirectory (on Windows, this is
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``Lib\site-packages``). If an existing directory is specified, it will be
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re-used.
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.. deprecated:: 3.6
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``pyvenv`` was the recommended tool for creating virtual environments for
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Python 3.3 and 3.4, and is `deprecated in Python 3.6
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<https://docs.python.org/dev/whatsnew/3.6.html#id8>`_.
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.. versionchanged:: 3.5
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The use of ``venv`` is now recommended for creating virtual environments.
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.. highlight:: none
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On Windows, invoke the ``venv`` command as follows::
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c:\>Python35\python -m venv c:\path\to\myenv
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Alternatively, if you configured the ``PATH`` and ``PATHEXT`` variables for
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your :ref:`Python installation <using-on-windows>`::
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c:\>python -m venv c:\path\to\myenv
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The command, if run with ``-h``, will show the available options::
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usage: venv [-h] [--system-site-packages] [--symlinks | --copies] [--clear]
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[--upgrade] [--without-pip] [--prompt PROMPT] [--upgrade-deps]
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ENV_DIR [ENV_DIR ...]
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Creates virtual Python environments in one or more target directories.
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positional arguments:
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ENV_DIR A directory to create the environment in.
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optional arguments:
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-h, --help show this help message and exit
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--system-site-packages
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Give the virtual environment access to the system
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site-packages dir.
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--symlinks Try to use symlinks rather than copies, when symlinks
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are not the default for the platform.
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--copies Try to use copies rather than symlinks, even when
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symlinks are the default for the platform.
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--clear Delete the contents of the environment directory if it
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already exists, before environment creation.
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--upgrade Upgrade the environment directory to use this version
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of Python, assuming Python has been upgraded in-place.
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--without-pip Skips installing or upgrading pip in the virtual
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environment (pip is bootstrapped by default)
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--prompt PROMPT Provides an alternative prompt prefix for this
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environment.
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--upgrade-deps Upgrade core dependencies: pip setuptools to the
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latest version in PyPI
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Once an environment has been created, you may wish to activate it, e.g. by
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sourcing an activate script in its bin directory.
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.. versionchanged:: 3.9
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Add ``--upgrade-deps`` option to upgrade pip + setuptools to the latest on PyPI
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.. versionchanged:: 3.4
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Installs pip by default, added the ``--without-pip`` and ``--copies``
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options
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.. versionchanged:: 3.4
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In earlier versions, if the target directory already existed, an error was
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raised, unless the ``--clear`` or ``--upgrade`` option was provided.
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.. note::
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While symlinks are supported on Windows, they are not recommended. Of
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particular note is that double-clicking ``python.exe`` in File Explorer
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will resolve the symlink eagerly and ignore the virtual environment.
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.. note::
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On Microsoft Windows, it may be required to enable the ``Activate.ps1``
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script by setting the execution policy for the user. You can do this by
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issuing the following PowerShell command:
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PS C:\> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
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See `About Execution Policies
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<https://go.microsoft.com/fwlink/?LinkID=135170>`_
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for more information.
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The created ``pyvenv.cfg`` file also includes the
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``include-system-site-packages`` key, set to ``true`` if ``venv`` is
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run with the ``--system-site-packages`` option, ``false`` otherwise.
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Unless the ``--without-pip`` option is given, :mod:`ensurepip` will be
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invoked to bootstrap ``pip`` into the virtual environment.
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Multiple paths can be given to ``venv``, in which case an identical virtual
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environment will be created, according to the given options, at each provided
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path.
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Once a virtual environment has been created, it can be "activated" using a
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script in the virtual environment's binary directory. The invocation of the
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script is platform-specific (`<venv>` must be replaced by the path of the
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directory containing the virtual environment):
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+-------------+-----------------+-----------------------------------------+
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| Platform | Shell | Command to activate virtual environment |
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+=============+=================+=========================================+
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| POSIX | bash/zsh | $ source <venv>/bin/activate |
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+-------------+-----------------+-----------------------------------------+
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| | fish | $ source <venv>/bin/activate.fish |
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+-------------+-----------------+-----------------------------------------+
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| | csh/tcsh | $ source <venv>/bin/activate.csh |
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+-------------+-----------------+-----------------------------------------+
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| | PowerShell Core | $ <venv>/bin/Activate.ps1 |
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+-------------+-----------------+-----------------------------------------+
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| Windows | cmd.exe | C:\\> <venv>\\Scripts\\activate.bat |
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+-------------+-----------------+-----------------------------------------+
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| | PowerShell | PS C:\\> <venv>\\Scripts\\Activate.ps1 |
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+-------------+-----------------+-----------------------------------------+
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When a virtual environment is active, the :envvar:`VIRTUAL_ENV` environment
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variable is set to the path of the virtual environment. This can be used to
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check if one is running inside a virtual environment.
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You don't specifically *need* to activate an environment; activation just
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prepends the virtual environment's binary directory to your path, so that
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"python" invokes the virtual environment's Python interpreter and you can run
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installed scripts without having to use their full path. However, all scripts
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installed in a virtual environment should be runnable without activating it,
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and run with the virtual environment's Python automatically.
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You can deactivate a virtual environment by typing "deactivate" in your shell.
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The exact mechanism is platform-specific and is an internal implementation
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detail (typically a script or shell function will be used).
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.. versionadded:: 3.4
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``fish`` and ``csh`` activation scripts.
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.. versionadded:: 3.8
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PowerShell activation scripts installed under POSIX for PowerShell Core
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support.
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