diff options
Diffstat (limited to 'Doc/library/site.rst')
| -rw-r--r-- | Doc/library/site.rst | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/Doc/library/site.rst b/Doc/library/site.rst index 579571aca5..36b80c379c 100644 --- a/Doc/library/site.rst +++ b/Doc/library/site.rst @@ -16,7 +16,14 @@ import can be suppressed using the interpreter's :option:`-S` option. .. index:: triple: module; search; path Importing this module will append site-specific paths to the module search path -and add a few builtins. +and add a few builtins, unless :option:`-S` was used. In that case, this module +can be safely imported with no automatic modifications to the module search path +or additions to the builtins. To explicitly trigger the usual site-specific +additions, call the :func:`site.main` function. + +.. versionchanged:: 3.3 + Importing the module used to trigger paths manipulation even when using + :option:`-S`. .. index:: pair: site-python; directory @@ -31,6 +38,15 @@ Unix and Macintosh). For each of the distinct head-tail combinations, it sees if it refers to an existing directory, and if so, adds it to ``sys.path`` and also inspects the newly added path for configuration files. +If a file named "pyvenv.cfg" exists one directory above sys.executable, +sys.prefix and sys.exec_prefix are set to that directory and +it is also checked for site-packages and site-python (sys.base_prefix and +sys.base_exec_prefix will always be the "real" prefixes of the Python +installation). If "pyvenv.cfg" (a bootstrap configuration file) contains +the key "include-system-site-packages" set to anything other than "false" +(case-insensitive), the system-level prefixes will still also be +searched for site-packages; otherwise they won't. + A path configuration file is a file whose name has the form :file:`{name}.pth` and exists in one of the four directories mentioned above; its contents are additional items (one per line) to be added to ``sys.path``. Non-existing items @@ -129,8 +145,19 @@ empty, and the path manipulations are skipped; however the import of :file:`~/Library/Python/{X.Y}` for Mac framework builds, and :file:`{%APPDATA%}\\Python` for Windows. This value is used by Distutils to compute the installation directories for scripts, data files, Python modules, - etc. for the :ref:`user installation scheme <inst-alt-install-user>`. See - also :envvar:`PYTHONUSERBASE`. + etc. for the :ref:`user installation scheme <inst-alt-install-user>`. + See also :envvar:`PYTHONUSERBASE`. + + +.. function:: main() + + Adds all the standard site-specific directories to the module search + path. This function is called automatically when this module is imported, + unless the :program:`python` interpreter was started with the :option:`-S` + flag. + + .. versionchanged:: 3.3 + This function used to be called unconditionnally. .. function:: addsitedir(sitedir, known_paths=None) |