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venv (package)


Virtual environment (venv) package for Python. Based on PEP 405.

Copyright (C) 2011-2014 Vinay Sajip.
Licensed to the PSF under a contributor agreement.

Classes

EnvBuilder


    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

clear_directory(self, path)

create(self, env_dir)


          Create a virtual environment in a directory.

          :param env_dir: The target directory to create an environment in.

create_configuration(self, context)


          Create a configuration file indicating where the environment's Python
          was copied from, and whether the system site-packages should be made
          available in the environment.

          :param context: The information for the environment creation request
                          being processed.

ensure_directories(self, env_dir)


          Create the directories for the environment.

          Returns a context object which holds paths in the environment,
          for use by subsequent logic.

install_scripts(self, context, path)


          Install scripts into the created environment from a directory.

          :param context: The information for the environment creation request
                          being processed.
          :param path:    Absolute pathname of a directory containing script.
                          Scripts in the 'common' subdirectory of this directory,
                          and those in the directory named for the platform
                          being run on, are installed in the created environment.
                          Placeholder variables are replaced with environment-
                          specific values.

post_setup(self, context)


          Hook for post-setup modification of the venv. Subclasses may install
          additional packages or scripts here, add activation shell scripts, etc.

          :param context: The information for the environment creation request
                          being processed.

replace_variables(self, text, context)


          Replace variable placeholders in script text with context-specific
          variables.

          Return the text passed in , but with variables replaced.

          :param text: The text in which to replace placeholder variables.
          :param context: The information for the environment creation request
                          being processed.

setup_python(self, context)


          Set up a Python executable in the environment.

          :param context: The information for the environment creation request
                          being processed.

setup_scripts(self, context)


          Set up scripts into the created environment from a directory.

          This method installs the default scripts into the environment
          being created. You can prevent the default installation by overriding
          this method if you really need to, or if you need to specify
          a different location for the scripts to install. By default, the
          'scripts' directory in the venv package is used as the source of
          scripts to install.

symlink_or_copy(self, src, dst, relative_symlinks_ok=False)


              Try symlinking a file, and if that fails, fall back to copying.

upgrade_dependencies(self, context)

Functions

create

create(env_dir, system_site_packages=False, clear=False, symlinks=False, with_pip=False, prompt=None, upgrade_deps=False)

  Create a virtual environment in a directory.

main

main(args=None)

Other members

CORE_VENV_DEPS = ('pip', 'setuptools')

logger = <Logger venv (INFO)>

Modules