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