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Virtual environment (venv) package for Python. Based on PEP 405.
Copyright (C) 2011-2014 Vinay Sajip.
Licensed to the PSF under a contributor agreement.
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This class exists to allow virtual environment creation to be
customized. The constructor parameters determine the builder's
behaviour when called upon to create a virtual environment.
By default, the builder makes the system (global) site-packages dir
*un*available to the created environment.
If invoked using the Python -m option, the default is to use copying
on Windows platforms but symlinks elsewhere. If instantiated some
other way, the default is to *not* use symlinks.
:param system_site_packages: If True, the system (global) site-packages
dir is available to created environments.
:param clear: If True, delete the contents of the environment directory if
it already exists, before environment creation.
:param symlinks: If True, attempt to symlink rather than copy files into
virtual environment.
:param upgrade: If True, upgrade an existing virtual environment.
:param with_pip: If True, ensure pip is installed in the virtual
environment
:param prompt: Alternative terminal prefix for the environment.
:param upgrade_deps: Update the base venv modules to the latest on PyPI
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Create a virtual environment in a directory.
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Create the directories for the environment.
Returns a context object which holds paths in the environment,
for use by subsequent logic.
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Set up scripts into the created environment from a directory.
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this method if you really need to, or if you need to specify
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Hook for post-setup modification of the venv. Subclasses may install
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Replace variable placeholders in script text with context-specific
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Install scripts into the created environment from a directory.
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