EnvBuilder ( system_site_packages = False, clear = False, symlinks = False, upgrade = False, with_pip = False, prompt = None, upgrade_deps = False ) ¶ Mechanisms for third-party virtual environment creators to customize environmentĬreation according to their needs, the EnvBuilder class. The high-level method described above makes use of a simple API which provides The exact mechanism is platform-specific and is an internal implementationĭetail (typically, a script or shell function will be used). You can deactivate a virtual environment by typing deactivate in your shell. If you move an environmentīecause you moved a parent directory of it, you should recreate theĮnvironment in its new location. Location and delete the one at the old location. If for any reason you need to move theĮnvironment to a new location, you should recreate it at the desired Requirements file requirements.txt, you can invoke pip install -r requirements.txt using the environment’s pip to install all of the Simple means of recreating an environment (for example, if you have a Inherently non-portable, in the general case. Whether a virtual environment is being used.īecause scripts installed in environments should not expect theĮnvironment to be activated, their shebang lines contain the absolute paths VIRTUAL_ENV cannot be relied upon to determine Since explicitly activating a virtual environment is not required to use it, When a virtual environment has been activated, the VIRTUAL_ENVĮnvironment variable is set to the path of the environment. Without the environment needing to be activated or on the PATH. Script in a Windows Explorer window should run it with the correct interpreter You have the Python Launcher for Windows installed. On Windows, “shebang” line processing is supported if This means that the script will run with that interpreter regardless of the In order to achieve this, scripts installed into virtual environments haveĪ “shebang” line which points to the environment’s Python interpreter, Should be runnable without activating it. You don’t specifically need to activate a virtual environment,Īs you can just specify the full path to that environment’sįurthermore, all scripts installed in the environment New in version 3.8: PowerShell activation scripts installed under POSIX for PowerShell Core ( must be replaced by the path to the directory The invocation of the activation script is platform-specific Python will invoke the environment’s Python interpreterĪnd you can run installed scripts without having to use their full path. This will prepend that directory to your PATH, so that running Sys.prefix != sys.base_prefix to determine if the current interpreter isĪ virtual environment may be “activated” using a script in its binary directory Point to those of the base Python used to create the environment. Whereas sys.base_prefix and sys.base_exec_prefix Point to the directories of the virtual environment, When a Python interpreter is running from a virtual environment, Multiple paths can be given to venv, in which case an identical virtualĮnvironment will be created, according to the given options, at each provided Invoked to bootstrap pip into the virtual environment. Unless the -without-pip option is given, ensurepip will be Run with the -system-site-packages option, false otherwise. Include-system-site-packages key, set to true if venv is The created pyvenv.cfg file also includes the PS C:> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser Issuing the following PowerShell command: Script by setting the execution policy for the user. On Microsoft Windows, it may be required to enable the Activate.ps1 Sourcing an activate script in its bin directory. Once an environment has been created, you may wish to activate it, e.g. upgrade-deps Upgrade core dependencies: pip setuptools to the prompt PROMPT Provides an alternative prompt prefix for this without-pip Skips installing or upgrading pip in the virtualĮnvironment (pip is bootstrapped by default) Of Python, assuming Python has been upgraded in-place. upgrade Upgrade the environment directory to use this version clear Delete the contents of the environment directory if itĪlready exists, before environment creation. Symlinks are the default for the platform. copies Try to use copies rather than symlinks, even when symlinks Try to use symlinks rather than copies, when symlinks Give the virtual environment access to the system h, -help show this help message and exit Ĭreates virtual Python environments in one or more target directories.ĮNV_DIR A directory to create the environment in.
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