mirror of
https://github.com/python/cpython.git
synced 2025-10-31 13:41:24 +00:00
85 lines
3.5 KiB
PHP
85 lines
3.5 KiB
PHP
Creation of :ref:`virtual environments <venv-def>` is done by executing the
|
|
``pyvenv`` script::
|
|
|
|
pyvenv /path/to/new/virtual/environment
|
|
|
|
Running this command creates the target directory (creating any parent
|
|
directories that don't exist already) and places a ``pyvenv.cfg`` file in it
|
|
with a ``home`` key pointing to the Python installation the command was run
|
|
from. It also creates a ``bin`` (or ``Scripts`` on Windows) subdirectory
|
|
containing a copy of the ``python`` binary (or binaries, in the case of
|
|
Windows). It also creates an (initially empty) ``lib/pythonX.Y/site-packages``
|
|
subdirectory (on Windows, this is ``Lib\site-packages``).
|
|
|
|
.. highlight:: none
|
|
|
|
On Windows, you may have to invoke the ``pyvenv`` script as follows, if you
|
|
don't have the relevant PATH and PATHEXT settings::
|
|
|
|
c:\Temp>c:\Python33\python c:\Python33\Tools\Scripts\pyvenv.py myenv
|
|
|
|
or equivalently::
|
|
|
|
c:\Temp>c:\Python33\python -m venv myenv
|
|
|
|
The command, if run with ``-h``, will show the available options::
|
|
|
|
usage: pyvenv [-h] [--system-site-packages] [--symlinks] [--clear]
|
|
[--upgrade] ENV_DIR [ENV_DIR ...]
|
|
|
|
Creates virtual Python environments in one or more target directories.
|
|
|
|
positional arguments:
|
|
ENV_DIR A directory to create the environment in.
|
|
|
|
optional arguments:
|
|
-h, --help show this help message and exit
|
|
--system-site-packages Give access to the global site-packages dir to the
|
|
virtual environment.
|
|
--symlinks Try to use symlinks rather than copies, when symlinks
|
|
are not the default for the platform.
|
|
--clear Delete the environment directory if it already exists.
|
|
If not specified and the directory exists, an error is
|
|
raised.
|
|
--upgrade Upgrade the environment directory to use this version
|
|
of Python, assuming Python has been upgraded in-place.
|
|
|
|
If the target directory already exists an error will be raised, unless
|
|
the ``--clear`` or ``--upgrade`` option was provided.
|
|
|
|
The created ``pyvenv.cfg`` file also includes the
|
|
``include-system-site-packages`` key, set to ``true`` if ``venv`` is
|
|
run with the ``--system-site-packages`` option, ``false`` otherwise.
|
|
|
|
Multiple paths can be given to ``pyvenv``, in which case an identical
|
|
virtualenv will be created, according to the given options, at each
|
|
provided path.
|
|
|
|
Once a venv has been created, it can be "activated" using a script in the
|
|
venv's binary directory. The invocation of the script is platform-specific: on
|
|
a Posix platform, you would typically do::
|
|
|
|
$ source <venv>/bin/activate
|
|
|
|
whereas on Windows, you might do::
|
|
|
|
C:\> <venv>/Scripts/activate
|
|
|
|
if you are using the ``cmd.exe`` shell, or perhaps::
|
|
|
|
PS C:\> <venv>/Scripts/Activate.ps1
|
|
|
|
if you use PowerShell.
|
|
|
|
You don't specifically *need* to activate an environment; activation just
|
|
prepends the venv's binary directory to your path, so that "python" invokes the
|
|
venv's Python interpreter and you can run installed scripts without having to
|
|
use their full path. However, all scripts installed in a venv should be
|
|
runnable without activating it, and run with the venv's Python automatically.
|
|
|
|
You can deactivate a venv by typing "deactivate" in your shell. The exact
|
|
mechanism is platform-specific: for example, the Bash activation script defines
|
|
a "deactivate" function, whereas on Windows there are separate scripts called
|
|
``deactivate.bat`` and ``Deactivate.ps1`` which are installed when the venv is
|
|
created.
|
|
|