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+
+:mod:`pydoc` --- Documentation generator and online help system
+===============================================================
+
+.. module:: pydoc
+ :synopsis: Documentation generator and online help system.
+.. moduleauthor:: Ka-Ping Yee <ping@lfw.org>
+.. sectionauthor:: Ka-Ping Yee <ping@lfw.org>
+
+
+.. versionadded:: 2.1
+
+.. index::
+ single: documentation; generation
+ single: documentation; online
+ single: help; online
+
+The :mod:`pydoc` module automatically generates documentation from Python
+modules. The documentation can be presented as pages of text on the console,
+served to a Web browser, or saved to HTML files.
+
+The built-in function :func:`help` invokes the online help system in the
+interactive interpreter, which uses :mod:`pydoc` to generate its documentation
+as text on the console. The same text documentation can also be viewed from
+outside the Python interpreter by running :program:`pydoc` as a script at the
+operating system's command prompt. For example, running ::
+
+ pydoc sys
+
+at a shell prompt will display documentation on the :mod:`sys` module, in a
+style similar to the manual pages shown by the Unix :program:`man` command. The
+argument to :program:`pydoc` can be the name of a function, module, or package,
+or a dotted reference to a class, method, or function within a module or module
+in a package. If the argument to :program:`pydoc` looks like a path (that is,
+it contains the path separator for your operating system, such as a slash in
+Unix), and refers to an existing Python source file, then documentation is
+produced for that file.
+
+Specifying a :option:`-w` flag before the argument will cause HTML documentation
+to be written out to a file in the current directory, instead of displaying text
+on the console.
+
+Specifying a :option:`-k` flag before the argument will search the synopsis
+lines of all available modules for the keyword given as the argument, again in a
+manner similar to the Unix :program:`man` command. The synopsis line of a
+module is the first line of its documentation string.
+
+You can also use :program:`pydoc` to start an HTTP server on the local machine
+that will serve documentation to visiting Web browsers. :program:`pydoc`
+:option:`-p 1234` will start a HTTP server on port 1234, allowing you to browse
+the documentation at ``http://localhost:1234/`` in your preferred Web browser.
+:program:`pydoc` :option:`-g` will start the server and additionally bring up a
+small :mod:`Tkinter`\ -based graphical interface to help you search for
+documentation pages.
+
+When :program:`pydoc` generates documentation, it uses the current environment
+and path to locate modules. Thus, invoking :program:`pydoc` :option:`spam`
+documents precisely the version of the module you would get if you started the
+Python interpreter and typed ``import spam``.
+
+Module docs for core modules are assumed to reside in
+http://www.python.org/doc/current/lib/. This can be overridden by setting the
+:envvar:`PYTHONDOCS` environment variable to a different URL or to a local
+directory containing the Library Reference Manual pages.
+