author | bugtracker-ml@nttdocomo.com |
Sun, 04 Jul 2010 21:21:52 +0100 | |
changeset 84 | 05f4463787cf |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`htmllib` --- A parser for HTML documents |
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============================================== |
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.. module:: htmllib |
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:synopsis: A parser for HTML documents. |
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:deprecated: |
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.. deprecated:: 2.6 |
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The :mod:`htmllib` module has been removed in Python 3.0. |
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.. index:: |
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single: HTML |
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single: hypertext |
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.. index:: |
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module: sgmllib |
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module: formatter |
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single: SGMLParser (in module sgmllib) |
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This module defines a class which can serve as a base for parsing text files |
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formatted in the HyperText Mark-up Language (HTML). The class is not directly |
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concerned with I/O --- it must be provided with input in string form via a |
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method, and makes calls to methods of a "formatter" object in order to produce |
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output. The :class:`HTMLParser` class is designed to be used as a base class |
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for other classes in order to add functionality, and allows most of its methods |
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to be extended or overridden. In turn, this class is derived from and extends |
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the :class:`SGMLParser` class defined in module :mod:`sgmllib`. The |
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:class:`HTMLParser` implementation supports the HTML 2.0 language as described |
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in :rfc:`1866`. Two implementations of formatter objects are provided in the |
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:mod:`formatter` module; refer to the documentation for that module for |
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information on the formatter interface. |
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The following is a summary of the interface defined by |
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:class:`sgmllib.SGMLParser`: |
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* The interface to feed data to an instance is through the :meth:`feed` method, |
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which takes a string argument. This can be called with as little or as much |
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text at a time as desired; ``p.feed(a); p.feed(b)`` has the same effect as |
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``p.feed(a+b)``. When the data contains complete HTML markup constructs, these |
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are processed immediately; incomplete constructs are saved in a buffer. To |
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force processing of all unprocessed data, call the :meth:`close` method. |
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For example, to parse the entire contents of a file, use:: |
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parser.feed(open('myfile.html').read()) |
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parser.close() |
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* The interface to define semantics for HTML tags is very simple: derive a class |
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and define methods called :meth:`start_tag`, :meth:`end_tag`, or :meth:`do_tag`. |
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The parser will call these at appropriate moments: :meth:`start_tag` or |
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:meth:`do_tag` is called when an opening tag of the form ``<tag ...>`` is |
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encountered; :meth:`end_tag` is called when a closing tag of the form ``<tag>`` |
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is encountered. If an opening tag requires a corresponding closing tag, like |
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``<H1>`` ... ``</H1>``, the class should define the :meth:`start_tag` method; if |
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a tag requires no closing tag, like ``<P>``, the class should define the |
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:meth:`do_tag` method. |
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The module defines a parser class and an exception: |
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.. class:: HTMLParser(formatter) |
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This is the basic HTML parser class. It supports all entity names required by |
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the XHTML 1.0 Recommendation (http://www.w3.org/TR/xhtml1). It also defines |
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handlers for all HTML 2.0 and many HTML 3.0 and 3.2 elements. |
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.. exception:: HTMLParseError |
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Exception raised by the :class:`HTMLParser` class when it encounters an error |
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while parsing. |
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.. versionadded:: 2.4 |
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.. seealso:: |
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Module :mod:`formatter` |
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Interface definition for transforming an abstract flow of formatting events into |
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specific output events on writer objects. |
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Module :mod:`HTMLParser` |
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Alternate HTML parser that offers a slightly lower-level view of the input, but |
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is designed to work with XHTML, and does not implement some of the SGML syntax |
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not used in "HTML as deployed" and which isn't legal for XHTML. |
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Module :mod:`htmlentitydefs` |
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Definition of replacement text for XHTML 1.0 entities. |
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Module :mod:`sgmllib` |
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Base class for :class:`HTMLParser`. |
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.. _html-parser-objects: |
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HTMLParser Objects |
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------------------ |
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In addition to tag methods, the :class:`HTMLParser` class provides some |
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additional methods and instance variables for use within tag methods. |
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.. attribute:: HTMLParser.formatter |
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This is the formatter instance associated with the parser. |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
108 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
109 |
.. attribute:: HTMLParser.nofill |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
110 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
111 |
Boolean flag which should be true when whitespace should not be collapsed, or |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
112 |
false when it should be. In general, this should only be true when character |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
113 |
data is to be treated as "preformatted" text, as within a ``<PRE>`` element. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
114 |
The default value is false. This affects the operation of :meth:`handle_data` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
115 |
and :meth:`save_end`. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
116 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
117 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
118 |
.. method:: HTMLParser.anchor_bgn(href, name, type) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
119 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
120 |
This method is called at the start of an anchor region. The arguments |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
121 |
correspond to the attributes of the ``<A>`` tag with the same names. The |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
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|
122 |
default implementation maintains a list of hyperlinks (defined by the ``HREF`` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
123 |
attribute for ``<A>`` tags) within the document. The list of hyperlinks is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
124 |
available as the data attribute :attr:`anchorlist`. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
125 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
126 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
127 |
.. method:: HTMLParser.anchor_end() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
128 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
129 |
This method is called at the end of an anchor region. The default |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
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|
130 |
implementation adds a textual footnote marker using an index into the list of |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
131 |
hyperlinks created by :meth:`anchor_bgn`. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
132 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
133 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
134 |
.. method:: HTMLParser.handle_image(source, alt[, ismap[, align[, width[, height]]]]) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
135 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
136 |
This method is called to handle images. The default implementation simply |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
137 |
passes the *alt* value to the :meth:`handle_data` method. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
138 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
139 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
140 |
.. method:: HTMLParser.save_bgn() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
141 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
142 |
Begins saving character data in a buffer instead of sending it to the formatter |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
143 |
object. Retrieve the stored data via :meth:`save_end`. Use of the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
144 |
:meth:`save_bgn` / :meth:`save_end` pair may not be nested. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
147 |
.. method:: HTMLParser.save_end() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
148 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
149 |
Ends buffering character data and returns all data saved since the preceding |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
call to :meth:`save_bgn`. If the :attr:`nofill` flag is false, whitespace is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
collapsed to single spaces. A call to this method without a preceding call to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
152 |
:meth:`save_bgn` will raise a :exc:`TypeError` exception. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
155 |
:mod:`htmlentitydefs` --- Definitions of HTML general entities |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
156 |
============================================================== |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
157 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
158 |
.. module:: htmlentitydefs |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
159 |
:synopsis: Definitions of HTML general entities. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
160 |
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
161 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
162 |
.. note:: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
163 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
164 |
The :mod:`htmlentitydefs` module has been renamed to :mod:`html.entities` in |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
165 |
Python 3.0. The :term:`2to3` tool will automatically adapt imports when |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
166 |
converting your sources to 3.0. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
168 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
169 |
This module defines three dictionaries, ``name2codepoint``, ``codepoint2name``, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
170 |
and ``entitydefs``. ``entitydefs`` is used by the :mod:`htmllib` module to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
171 |
provide the :attr:`entitydefs` member of the :class:`HTMLParser` class. The |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
172 |
definition provided here contains all the entities defined by XHTML 1.0 that |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
173 |
can be handled using simple textual substitution in the Latin-1 character set |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
174 |
(ISO-8859-1). |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
175 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
176 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
177 |
.. data:: entitydefs |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
178 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
179 |
A dictionary mapping XHTML 1.0 entity definitions to their replacement text in |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
180 |
ISO Latin-1. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
181 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
182 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
183 |
.. data:: name2codepoint |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
184 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
185 |
A dictionary that maps HTML entity names to the Unicode codepoints. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
186 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
187 |
.. versionadded:: 2.3 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
188 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
189 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
190 |
.. data:: codepoint2name |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
191 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
192 |
A dictionary that maps Unicode codepoints to HTML entity names. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
193 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
194 |
.. versionadded:: 2.3 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
195 |