Added pyvenv docs to 'Python Setup and Usage' section.

Doc/library/venv.rst

@@ -54,7 +54,7 @@ or equivalently::
 The command, if run with ``-h``, will show the available options::
 
     usage: pyvenv [-h] [--system-site-packages] [--symlink] [--clear]
-                  ENV_DIR [ENV_DIR ...]
+                  [--upgrade] ENV_DIR [ENV_DIR ...]
 
     Creates virtual Python environments in one or more target directories.
 
@@ -69,12 +69,11 @@ The command, if run with ``-h``, will show the available options::
       --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`` option was provided, in which case the target
-directory will be deleted and virtual environment creation will
-proceed as usual.
+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

Doc/using/index.rst

@@ -17,4 +17,4 @@ interpreter and things that make working with Python easier.
    unix.rst
    windows.rst
    mac.rst
-
+   scripts.rst

Doc/using/scripts.rst

@@ -0,0 +1,66 @@
+.. _tools-and-scripts:
+
+Additional Tools and Scripts
+============================
+
+pyvenv - Creating virtual environments
+--------------------------------------
+
+Creation of virtual environments 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) and the ``pysetup3`` script (to
+facilitate easy installation of packages from PyPI into the new virtualenv).
+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] [--symlink] [--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.
+      --symlink              Attempt to symlink rather than copy.
+      --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.
+