mirror of
https://github.com/python/cpython.git
synced 2024-12-16 05:14:41 +08:00
76cd81d603
* issue43882 - urllib.parse should sanitize urls containing ASCII newline and tabs. Co-authored-by: Gregory P. Smith <greg@krypto.org> Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
713 lines
31 KiB
ReStructuredText
713 lines
31 KiB
ReStructuredText
:mod:`urllib.parse` --- Parse URLs into components
|
|
==================================================
|
|
|
|
.. module:: urllib.parse
|
|
:synopsis: Parse URLs into or assemble them from components.
|
|
|
|
**Source code:** :source:`Lib/urllib/parse.py`
|
|
|
|
.. index::
|
|
single: WWW
|
|
single: World Wide Web
|
|
single: URL
|
|
pair: URL; parsing
|
|
pair: relative; URL
|
|
|
|
--------------
|
|
|
|
This module defines a standard interface to break Uniform Resource Locator (URL)
|
|
strings up in components (addressing scheme, network location, path etc.), to
|
|
combine the components back into a URL string, and to convert a "relative URL"
|
|
to an absolute URL given a "base URL."
|
|
|
|
The module has been designed to match the Internet RFC on Relative Uniform
|
|
Resource Locators. It supports the following URL schemes: ``file``, ``ftp``,
|
|
``gopher``, ``hdl``, ``http``, ``https``, ``imap``, ``mailto``, ``mms``,
|
|
``news``, ``nntp``, ``prospero``, ``rsync``, ``rtsp``, ``rtspu``, ``sftp``,
|
|
``shttp``, ``sip``, ``sips``, ``snews``, ``svn``, ``svn+ssh``, ``telnet``,
|
|
``wais``, ``ws``, ``wss``.
|
|
|
|
The :mod:`urllib.parse` module defines functions that fall into two broad
|
|
categories: URL parsing and URL quoting. These are covered in detail in
|
|
the following sections.
|
|
|
|
URL Parsing
|
|
-----------
|
|
|
|
The URL parsing functions focus on splitting a URL string into its components,
|
|
or on combining URL components into a URL string.
|
|
|
|
.. function:: urlparse(urlstring, scheme='', allow_fragments=True)
|
|
|
|
Parse a URL into six components, returning a 6-item :term:`named tuple`. This
|
|
corresponds to the general structure of a URL:
|
|
``scheme://netloc/path;parameters?query#fragment``.
|
|
Each tuple item is a string, possibly empty. The components are not broken up
|
|
into smaller parts (for example, the network location is a single string), and %
|
|
escapes are not expanded. The delimiters as shown above are not part of the
|
|
result, except for a leading slash in the *path* component, which is retained if
|
|
present. For example:
|
|
|
|
>>> from urllib.parse import urlparse
|
|
>>> o = urlparse('http://www.cwi.nl:80/%7Eguido/Python.html')
|
|
>>> o # doctest: +NORMALIZE_WHITESPACE
|
|
ParseResult(scheme='http', netloc='www.cwi.nl:80', path='/%7Eguido/Python.html',
|
|
params='', query='', fragment='')
|
|
>>> o.scheme
|
|
'http'
|
|
>>> o.port
|
|
80
|
|
>>> o.geturl()
|
|
'http://www.cwi.nl:80/%7Eguido/Python.html'
|
|
|
|
Following the syntax specifications in :rfc:`1808`, urlparse recognizes
|
|
a netloc only if it is properly introduced by '//'. Otherwise the
|
|
input is presumed to be a relative URL and thus to start with
|
|
a path component.
|
|
|
|
.. doctest::
|
|
:options: +NORMALIZE_WHITESPACE
|
|
|
|
>>> from urllib.parse import urlparse
|
|
>>> urlparse('//www.cwi.nl:80/%7Eguido/Python.html')
|
|
ParseResult(scheme='', netloc='www.cwi.nl:80', path='/%7Eguido/Python.html',
|
|
params='', query='', fragment='')
|
|
>>> urlparse('www.cwi.nl/%7Eguido/Python.html')
|
|
ParseResult(scheme='', netloc='', path='www.cwi.nl/%7Eguido/Python.html',
|
|
params='', query='', fragment='')
|
|
>>> urlparse('help/Python.html')
|
|
ParseResult(scheme='', netloc='', path='help/Python.html', params='',
|
|
query='', fragment='')
|
|
|
|
The *scheme* argument gives the default addressing scheme, to be
|
|
used only if the URL does not specify one. It should be the same type
|
|
(text or bytes) as *urlstring*, except that the default value ``''`` is
|
|
always allowed, and is automatically converted to ``b''`` if appropriate.
|
|
|
|
If the *allow_fragments* argument is false, fragment identifiers are not
|
|
recognized. Instead, they are parsed as part of the path, parameters
|
|
or query component, and :attr:`fragment` is set to the empty string in
|
|
the return value.
|
|
|
|
The return value is a :term:`named tuple`, which means that its items can
|
|
be accessed by index or as named attributes, which are:
|
|
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| Attribute | Index | Value | Value if not present |
|
|
+==================+=======+==========================+======================+
|
|
| :attr:`scheme` | 0 | URL scheme specifier | *scheme* parameter |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`netloc` | 1 | Network location part | empty string |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`path` | 2 | Hierarchical path | empty string |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`params` | 3 | Parameters for last path | empty string |
|
|
| | | element | |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`query` | 4 | Query component | empty string |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`fragment` | 5 | Fragment identifier | empty string |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`username` | | User name | :const:`None` |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`password` | | Password | :const:`None` |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`hostname` | | Host name (lower case) | :const:`None` |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
| :attr:`port` | | Port number as integer, | :const:`None` |
|
|
| | | if present | |
|
|
+------------------+-------+--------------------------+----------------------+
|
|
|
|
Reading the :attr:`port` attribute will raise a :exc:`ValueError` if
|
|
an invalid port is specified in the URL. See section
|
|
:ref:`urlparse-result-object` for more information on the result object.
|
|
|
|
Unmatched square brackets in the :attr:`netloc` attribute will raise a
|
|
:exc:`ValueError`.
|
|
|
|
Characters in the :attr:`netloc` attribute that decompose under NFKC
|
|
normalization (as used by the IDNA encoding) into any of ``/``, ``?``,
|
|
``#``, ``@``, or ``:`` will raise a :exc:`ValueError`. If the URL is
|
|
decomposed before parsing, no error will be raised.
|
|
|
|
As is the case with all named tuples, the subclass has a few additional methods
|
|
and attributes that are particularly useful. One such method is :meth:`_replace`.
|
|
The :meth:`_replace` method will return a new ParseResult object replacing specified
|
|
fields with new values.
|
|
|
|
.. doctest::
|
|
:options: +NORMALIZE_WHITESPACE
|
|
|
|
>>> from urllib.parse import urlparse
|
|
>>> u = urlparse('//www.cwi.nl:80/%7Eguido/Python.html')
|
|
>>> u
|
|
ParseResult(scheme='', netloc='www.cwi.nl:80', path='/%7Eguido/Python.html',
|
|
params='', query='', fragment='')
|
|
>>> u._replace(scheme='http')
|
|
ParseResult(scheme='http', netloc='www.cwi.nl:80', path='/%7Eguido/Python.html',
|
|
params='', query='', fragment='')
|
|
|
|
|
|
.. versionchanged:: 3.2
|
|
Added IPv6 URL parsing capabilities.
|
|
|
|
.. versionchanged:: 3.3
|
|
The fragment is now parsed for all URL schemes (unless *allow_fragment* is
|
|
false), in accordance with :rfc:`3986`. Previously, an allowlist of
|
|
schemes that support fragments existed.
|
|
|
|
.. versionchanged:: 3.6
|
|
Out-of-range port numbers now raise :exc:`ValueError`, instead of
|
|
returning :const:`None`.
|
|
|
|
.. versionchanged:: 3.8
|
|
Characters that affect netloc parsing under NFKC normalization will
|
|
now raise :exc:`ValueError`.
|
|
|
|
|
|
.. function:: parse_qs(qs, keep_blank_values=False, strict_parsing=False, encoding='utf-8', errors='replace', max_num_fields=None, separator='&')
|
|
|
|
Parse a query string given as a string argument (data of type
|
|
:mimetype:`application/x-www-form-urlencoded`). Data are returned as a
|
|
dictionary. The dictionary keys are the unique query variable names and the
|
|
values are lists of values for each name.
|
|
|
|
The optional argument *keep_blank_values* is a flag indicating whether blank
|
|
values in percent-encoded queries should be treated as blank strings. A true value
|
|
indicates that blanks should be retained as blank strings. The default false
|
|
value indicates that blank values are to be ignored and treated as if they were
|
|
not included.
|
|
|
|
The optional argument *strict_parsing* is a flag indicating what to do with
|
|
parsing errors. If false (the default), errors are silently ignored. If true,
|
|
errors raise a :exc:`ValueError` exception.
|
|
|
|
The optional *encoding* and *errors* parameters specify how to decode
|
|
percent-encoded sequences into Unicode characters, as accepted by the
|
|
:meth:`bytes.decode` method.
|
|
|
|
The optional argument *max_num_fields* is the maximum number of fields to
|
|
read. If set, then throws a :exc:`ValueError` if there are more than
|
|
*max_num_fields* fields read.
|
|
|
|
The optional argument *separator* is the symbol to use for separating the
|
|
query arguments. It defaults to ``&``.
|
|
|
|
Use the :func:`urllib.parse.urlencode` function (with the ``doseq``
|
|
parameter set to ``True``) to convert such dictionaries into query
|
|
strings.
|
|
|
|
|
|
.. versionchanged:: 3.2
|
|
Add *encoding* and *errors* parameters.
|
|
|
|
.. versionchanged:: 3.8
|
|
Added *max_num_fields* parameter.
|
|
|
|
.. versionchanged:: 3.10
|
|
Added *separator* parameter with the default value of ``&``. Python
|
|
versions earlier than Python 3.10 allowed using both ``;`` and ``&`` as
|
|
query parameter separator. This has been changed to allow only a single
|
|
separator key, with ``&`` as the default separator.
|
|
|
|
|
|
.. function:: parse_qsl(qs, keep_blank_values=False, strict_parsing=False, encoding='utf-8', errors='replace', max_num_fields=None, separator='&')
|
|
|
|
Parse a query string given as a string argument (data of type
|
|
:mimetype:`application/x-www-form-urlencoded`). Data are returned as a list of
|
|
name, value pairs.
|
|
|
|
The optional argument *keep_blank_values* is a flag indicating whether blank
|
|
values in percent-encoded queries should be treated as blank strings. A true value
|
|
indicates that blanks should be retained as blank strings. The default false
|
|
value indicates that blank values are to be ignored and treated as if they were
|
|
not included.
|
|
|
|
The optional argument *strict_parsing* is a flag indicating what to do with
|
|
parsing errors. If false (the default), errors are silently ignored. If true,
|
|
errors raise a :exc:`ValueError` exception.
|
|
|
|
The optional *encoding* and *errors* parameters specify how to decode
|
|
percent-encoded sequences into Unicode characters, as accepted by the
|
|
:meth:`bytes.decode` method.
|
|
|
|
The optional argument *max_num_fields* is the maximum number of fields to
|
|
read. If set, then throws a :exc:`ValueError` if there are more than
|
|
*max_num_fields* fields read.
|
|
|
|
The optional argument *separator* is the symbol to use for separating the
|
|
query arguments. It defaults to ``&``.
|
|
|
|
Use the :func:`urllib.parse.urlencode` function to convert such lists of pairs into
|
|
query strings.
|
|
|
|
.. versionchanged:: 3.2
|
|
Add *encoding* and *errors* parameters.
|
|
|
|
.. versionchanged:: 3.8
|
|
Added *max_num_fields* parameter.
|
|
|
|
.. versionchanged:: 3.10
|
|
Added *separator* parameter with the default value of ``&``. Python
|
|
versions earlier than Python 3.10 allowed using both ``;`` and ``&`` as
|
|
query parameter separator. This has been changed to allow only a single
|
|
separator key, with ``&`` as the default separator.
|
|
|
|
|
|
.. function:: urlunparse(parts)
|
|
|
|
Construct a URL from a tuple as returned by ``urlparse()``. The *parts*
|
|
argument can be any six-item iterable. This may result in a slightly
|
|
different, but equivalent URL, if the URL that was parsed originally had
|
|
unnecessary delimiters (for example, a ``?`` with an empty query; the RFC
|
|
states that these are equivalent).
|
|
|
|
|
|
.. function:: urlsplit(urlstring, scheme='', allow_fragments=True)
|
|
|
|
This is similar to :func:`urlparse`, but does not split the params from the URL.
|
|
This should generally be used instead of :func:`urlparse` if the more recent URL
|
|
syntax allowing parameters to be applied to each segment of the *path* portion
|
|
of the URL (see :rfc:`2396`) is wanted. A separate function is needed to
|
|
separate the path segments and parameters. This function returns a 5-item
|
|
:term:`named tuple`::
|
|
|
|
(addressing scheme, network location, path, query, fragment identifier).
|
|
|
|
The return value is a :term:`named tuple`, its items can be accessed by index
|
|
or as named attributes:
|
|
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| Attribute | Index | Value | Value if not present |
|
|
+==================+=======+=========================+======================+
|
|
| :attr:`scheme` | 0 | URL scheme specifier | *scheme* parameter |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`netloc` | 1 | Network location part | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`path` | 2 | Hierarchical path | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`query` | 3 | Query component | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`fragment` | 4 | Fragment identifier | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`username` | | User name | :const:`None` |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`password` | | Password | :const:`None` |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`hostname` | | Host name (lower case) | :const:`None` |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`port` | | Port number as integer, | :const:`None` |
|
|
| | | if present | |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
|
|
Reading the :attr:`port` attribute will raise a :exc:`ValueError` if
|
|
an invalid port is specified in the URL. See section
|
|
:ref:`urlparse-result-object` for more information on the result object.
|
|
|
|
Unmatched square brackets in the :attr:`netloc` attribute will raise a
|
|
:exc:`ValueError`.
|
|
|
|
Characters in the :attr:`netloc` attribute that decompose under NFKC
|
|
normalization (as used by the IDNA encoding) into any of ``/``, ``?``,
|
|
``#``, ``@``, or ``:`` will raise a :exc:`ValueError`. If the URL is
|
|
decomposed before parsing, no error will be raised.
|
|
|
|
Following the `WHATWG spec`_ that updates RFC 3986, ASCII newline
|
|
``\n``, ``\r`` and tab ``\t`` characters are stripped from the URL.
|
|
|
|
.. versionchanged:: 3.6
|
|
Out-of-range port numbers now raise :exc:`ValueError`, instead of
|
|
returning :const:`None`.
|
|
|
|
.. versionchanged:: 3.8
|
|
Characters that affect netloc parsing under NFKC normalization will
|
|
now raise :exc:`ValueError`.
|
|
|
|
.. versionchanged:: 3.10
|
|
ASCII newline and tab characters are stripped from the URL.
|
|
|
|
.. _WHATWG spec: https://url.spec.whatwg.org/#concept-basic-url-parser
|
|
|
|
.. function:: urlunsplit(parts)
|
|
|
|
Combine the elements of a tuple as returned by :func:`urlsplit` into a
|
|
complete URL as a string. The *parts* argument can be any five-item
|
|
iterable. This may result in a slightly different, but equivalent URL, if the
|
|
URL that was parsed originally had unnecessary delimiters (for example, a ?
|
|
with an empty query; the RFC states that these are equivalent).
|
|
|
|
|
|
.. function:: urljoin(base, url, allow_fragments=True)
|
|
|
|
Construct a full ("absolute") URL by combining a "base URL" (*base*) with
|
|
another URL (*url*). Informally, this uses components of the base URL, in
|
|
particular the addressing scheme, the network location and (part of) the
|
|
path, to provide missing components in the relative URL. For example:
|
|
|
|
>>> from urllib.parse import urljoin
|
|
>>> urljoin('http://www.cwi.nl/%7Eguido/Python.html', 'FAQ.html')
|
|
'http://www.cwi.nl/%7Eguido/FAQ.html'
|
|
|
|
The *allow_fragments* argument has the same meaning and default as for
|
|
:func:`urlparse`.
|
|
|
|
.. note::
|
|
|
|
If *url* is an absolute URL (that is, it starts with ``//`` or ``scheme://``),
|
|
the *url*'s hostname and/or scheme will be present in the result. For example:
|
|
|
|
.. doctest::
|
|
|
|
>>> urljoin('http://www.cwi.nl/%7Eguido/Python.html',
|
|
... '//www.python.org/%7Eguido')
|
|
'http://www.python.org/%7Eguido'
|
|
|
|
If you do not want that behavior, preprocess the *url* with :func:`urlsplit` and
|
|
:func:`urlunsplit`, removing possible *scheme* and *netloc* parts.
|
|
|
|
|
|
.. versionchanged:: 3.5
|
|
|
|
Behavior updated to match the semantics defined in :rfc:`3986`.
|
|
|
|
|
|
.. function:: urldefrag(url)
|
|
|
|
If *url* contains a fragment identifier, return a modified version of *url*
|
|
with no fragment identifier, and the fragment identifier as a separate
|
|
string. If there is no fragment identifier in *url*, return *url* unmodified
|
|
and an empty string.
|
|
|
|
The return value is a :term:`named tuple`, its items can be accessed by index
|
|
or as named attributes:
|
|
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| Attribute | Index | Value | Value if not present |
|
|
+==================+=======+=========================+======================+
|
|
| :attr:`url` | 0 | URL with no fragment | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
| :attr:`fragment` | 1 | Fragment identifier | empty string |
|
|
+------------------+-------+-------------------------+----------------------+
|
|
|
|
See section :ref:`urlparse-result-object` for more information on the result
|
|
object.
|
|
|
|
.. versionchanged:: 3.2
|
|
Result is a structured object rather than a simple 2-tuple.
|
|
|
|
.. function:: unwrap(url)
|
|
|
|
Extract the url from a wrapped URL (that is, a string formatted as
|
|
``<URL:scheme://host/path>``, ``<scheme://host/path>``, ``URL:scheme://host/path``
|
|
or ``scheme://host/path``). If *url* is not a wrapped URL, it is returned
|
|
without changes.
|
|
|
|
.. _parsing-ascii-encoded-bytes:
|
|
|
|
Parsing ASCII Encoded Bytes
|
|
---------------------------
|
|
|
|
The URL parsing functions were originally designed to operate on character
|
|
strings only. In practice, it is useful to be able to manipulate properly
|
|
quoted and encoded URLs as sequences of ASCII bytes. Accordingly, the
|
|
URL parsing functions in this module all operate on :class:`bytes` and
|
|
:class:`bytearray` objects in addition to :class:`str` objects.
|
|
|
|
If :class:`str` data is passed in, the result will also contain only
|
|
:class:`str` data. If :class:`bytes` or :class:`bytearray` data is
|
|
passed in, the result will contain only :class:`bytes` data.
|
|
|
|
Attempting to mix :class:`str` data with :class:`bytes` or
|
|
:class:`bytearray` in a single function call will result in a
|
|
:exc:`TypeError` being raised, while attempting to pass in non-ASCII
|
|
byte values will trigger :exc:`UnicodeDecodeError`.
|
|
|
|
To support easier conversion of result objects between :class:`str` and
|
|
:class:`bytes`, all return values from URL parsing functions provide
|
|
either an :meth:`encode` method (when the result contains :class:`str`
|
|
data) or a :meth:`decode` method (when the result contains :class:`bytes`
|
|
data). The signatures of these methods match those of the corresponding
|
|
:class:`str` and :class:`bytes` methods (except that the default encoding
|
|
is ``'ascii'`` rather than ``'utf-8'``). Each produces a value of a
|
|
corresponding type that contains either :class:`bytes` data (for
|
|
:meth:`encode` methods) or :class:`str` data (for
|
|
:meth:`decode` methods).
|
|
|
|
Applications that need to operate on potentially improperly quoted URLs
|
|
that may contain non-ASCII data will need to do their own decoding from
|
|
bytes to characters before invoking the URL parsing methods.
|
|
|
|
The behaviour described in this section applies only to the URL parsing
|
|
functions. The URL quoting functions use their own rules when producing
|
|
or consuming byte sequences as detailed in the documentation of the
|
|
individual URL quoting functions.
|
|
|
|
.. versionchanged:: 3.2
|
|
URL parsing functions now accept ASCII encoded byte sequences
|
|
|
|
|
|
.. _urlparse-result-object:
|
|
|
|
Structured Parse Results
|
|
------------------------
|
|
|
|
The result objects from the :func:`urlparse`, :func:`urlsplit` and
|
|
:func:`urldefrag` functions are subclasses of the :class:`tuple` type.
|
|
These subclasses add the attributes listed in the documentation for
|
|
those functions, the encoding and decoding support described in the
|
|
previous section, as well as an additional method:
|
|
|
|
.. method:: urllib.parse.SplitResult.geturl()
|
|
|
|
Return the re-combined version of the original URL as a string. This may
|
|
differ from the original URL in that the scheme may be normalized to lower
|
|
case and empty components may be dropped. Specifically, empty parameters,
|
|
queries, and fragment identifiers will be removed.
|
|
|
|
For :func:`urldefrag` results, only empty fragment identifiers will be removed.
|
|
For :func:`urlsplit` and :func:`urlparse` results, all noted changes will be
|
|
made to the URL returned by this method.
|
|
|
|
The result of this method remains unchanged if passed back through the original
|
|
parsing function:
|
|
|
|
>>> from urllib.parse import urlsplit
|
|
>>> url = 'HTTP://www.Python.org/doc/#'
|
|
>>> r1 = urlsplit(url)
|
|
>>> r1.geturl()
|
|
'http://www.Python.org/doc/'
|
|
>>> r2 = urlsplit(r1.geturl())
|
|
>>> r2.geturl()
|
|
'http://www.Python.org/doc/'
|
|
|
|
|
|
The following classes provide the implementations of the structured parse
|
|
results when operating on :class:`str` objects:
|
|
|
|
.. class:: DefragResult(url, fragment)
|
|
|
|
Concrete class for :func:`urldefrag` results containing :class:`str`
|
|
data. The :meth:`encode` method returns a :class:`DefragResultBytes`
|
|
instance.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. class:: ParseResult(scheme, netloc, path, params, query, fragment)
|
|
|
|
Concrete class for :func:`urlparse` results containing :class:`str`
|
|
data. The :meth:`encode` method returns a :class:`ParseResultBytes`
|
|
instance.
|
|
|
|
.. class:: SplitResult(scheme, netloc, path, query, fragment)
|
|
|
|
Concrete class for :func:`urlsplit` results containing :class:`str`
|
|
data. The :meth:`encode` method returns a :class:`SplitResultBytes`
|
|
instance.
|
|
|
|
|
|
The following classes provide the implementations of the parse results when
|
|
operating on :class:`bytes` or :class:`bytearray` objects:
|
|
|
|
.. class:: DefragResultBytes(url, fragment)
|
|
|
|
Concrete class for :func:`urldefrag` results containing :class:`bytes`
|
|
data. The :meth:`decode` method returns a :class:`DefragResult`
|
|
instance.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. class:: ParseResultBytes(scheme, netloc, path, params, query, fragment)
|
|
|
|
Concrete class for :func:`urlparse` results containing :class:`bytes`
|
|
data. The :meth:`decode` method returns a :class:`ParseResult`
|
|
instance.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. class:: SplitResultBytes(scheme, netloc, path, query, fragment)
|
|
|
|
Concrete class for :func:`urlsplit` results containing :class:`bytes`
|
|
data. The :meth:`decode` method returns a :class:`SplitResult`
|
|
instance.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
|
|
URL Quoting
|
|
-----------
|
|
|
|
The URL quoting functions focus on taking program data and making it safe
|
|
for use as URL components by quoting special characters and appropriately
|
|
encoding non-ASCII text. They also support reversing these operations to
|
|
recreate the original data from the contents of a URL component if that
|
|
task isn't already covered by the URL parsing functions above.
|
|
|
|
.. function:: quote(string, safe='/', encoding=None, errors=None)
|
|
|
|
Replace special characters in *string* using the ``%xx`` escape. Letters,
|
|
digits, and the characters ``'_.-~'`` are never quoted. By default, this
|
|
function is intended for quoting the path section of a URL. The optional
|
|
*safe* parameter specifies additional ASCII characters that should not be
|
|
quoted --- its default value is ``'/'``.
|
|
|
|
*string* may be either a :class:`str` or a :class:`bytes` object.
|
|
|
|
.. versionchanged:: 3.7
|
|
Moved from :rfc:`2396` to :rfc:`3986` for quoting URL strings. "~" is now
|
|
included in the set of unreserved characters.
|
|
|
|
The optional *encoding* and *errors* parameters specify how to deal with
|
|
non-ASCII characters, as accepted by the :meth:`str.encode` method.
|
|
*encoding* defaults to ``'utf-8'``.
|
|
*errors* defaults to ``'strict'``, meaning unsupported characters raise a
|
|
:class:`UnicodeEncodeError`.
|
|
*encoding* and *errors* must not be supplied if *string* is a
|
|
:class:`bytes`, or a :class:`TypeError` is raised.
|
|
|
|
Note that ``quote(string, safe, encoding, errors)`` is equivalent to
|
|
``quote_from_bytes(string.encode(encoding, errors), safe)``.
|
|
|
|
Example: ``quote('/El Niño/')`` yields ``'/El%20Ni%C3%B1o/'``.
|
|
|
|
|
|
.. function:: quote_plus(string, safe='', encoding=None, errors=None)
|
|
|
|
Like :func:`quote`, but also replace spaces with plus signs, as required for
|
|
quoting HTML form values when building up a query string to go into a URL.
|
|
Plus signs in the original string are escaped unless they are included in
|
|
*safe*. It also does not have *safe* default to ``'/'``.
|
|
|
|
Example: ``quote_plus('/El Niño/')`` yields ``'%2FEl+Ni%C3%B1o%2F'``.
|
|
|
|
|
|
.. function:: quote_from_bytes(bytes, safe='/')
|
|
|
|
Like :func:`quote`, but accepts a :class:`bytes` object rather than a
|
|
:class:`str`, and does not perform string-to-bytes encoding.
|
|
|
|
Example: ``quote_from_bytes(b'a&\xef')`` yields
|
|
``'a%26%EF'``.
|
|
|
|
|
|
.. function:: unquote(string, encoding='utf-8', errors='replace')
|
|
|
|
Replace ``%xx`` escapes with their single-character equivalent.
|
|
The optional *encoding* and *errors* parameters specify how to decode
|
|
percent-encoded sequences into Unicode characters, as accepted by the
|
|
:meth:`bytes.decode` method.
|
|
|
|
*string* may be either a :class:`str` or a :class:`bytes` object.
|
|
|
|
*encoding* defaults to ``'utf-8'``.
|
|
*errors* defaults to ``'replace'``, meaning invalid sequences are replaced
|
|
by a placeholder character.
|
|
|
|
Example: ``unquote('/El%20Ni%C3%B1o/')`` yields ``'/El Niño/'``.
|
|
|
|
.. versionchanged:: 3.9
|
|
*string* parameter supports bytes and str objects (previously only str).
|
|
|
|
|
|
|
|
|
|
.. function:: unquote_plus(string, encoding='utf-8', errors='replace')
|
|
|
|
Like :func:`unquote`, but also replace plus signs with spaces, as required
|
|
for unquoting HTML form values.
|
|
|
|
*string* must be a :class:`str`.
|
|
|
|
Example: ``unquote_plus('/El+Ni%C3%B1o/')`` yields ``'/El Niño/'``.
|
|
|
|
|
|
.. function:: unquote_to_bytes(string)
|
|
|
|
Replace ``%xx`` escapes with their single-octet equivalent, and return a
|
|
:class:`bytes` object.
|
|
|
|
*string* may be either a :class:`str` or a :class:`bytes` object.
|
|
|
|
If it is a :class:`str`, unescaped non-ASCII characters in *string*
|
|
are encoded into UTF-8 bytes.
|
|
|
|
Example: ``unquote_to_bytes('a%26%EF')`` yields ``b'a&\xef'``.
|
|
|
|
|
|
.. function:: urlencode(query, doseq=False, safe='', encoding=None, \
|
|
errors=None, quote_via=quote_plus)
|
|
|
|
Convert a mapping object or a sequence of two-element tuples, which may
|
|
contain :class:`str` or :class:`bytes` objects, to a percent-encoded ASCII
|
|
text string. If the resultant string is to be used as a *data* for POST
|
|
operation with the :func:`~urllib.request.urlopen` function, then
|
|
it should be encoded to bytes, otherwise it would result in a
|
|
:exc:`TypeError`.
|
|
|
|
The resulting string is a series of ``key=value`` pairs separated by ``'&'``
|
|
characters, where both *key* and *value* are quoted using the *quote_via*
|
|
function. By default, :func:`quote_plus` is used to quote the values, which
|
|
means spaces are quoted as a ``'+'`` character and '/' characters are
|
|
encoded as ``%2F``, which follows the standard for GET requests
|
|
(``application/x-www-form-urlencoded``). An alternate function that can be
|
|
passed as *quote_via* is :func:`quote`, which will encode spaces as ``%20``
|
|
and not encode '/' characters. For maximum control of what is quoted, use
|
|
``quote`` and specify a value for *safe*.
|
|
|
|
When a sequence of two-element tuples is used as the *query*
|
|
argument, the first element of each tuple is a key and the second is a
|
|
value. The value element in itself can be a sequence and in that case, if
|
|
the optional parameter *doseq* evaluates to ``True``, individual
|
|
``key=value`` pairs separated by ``'&'`` are generated for each element of
|
|
the value sequence for the key. The order of parameters in the encoded
|
|
string will match the order of parameter tuples in the sequence.
|
|
|
|
The *safe*, *encoding*, and *errors* parameters are passed down to
|
|
*quote_via* (the *encoding* and *errors* parameters are only passed
|
|
when a query element is a :class:`str`).
|
|
|
|
To reverse this encoding process, :func:`parse_qs` and :func:`parse_qsl` are
|
|
provided in this module to parse query strings into Python data structures.
|
|
|
|
Refer to :ref:`urllib examples <urllib-examples>` to find out how the
|
|
:func:`urllib.parse.urlencode` method can be used for generating the query
|
|
string of a URL or data for a POST request.
|
|
|
|
.. versionchanged:: 3.2
|
|
*query* supports bytes and string objects.
|
|
|
|
.. versionadded:: 3.5
|
|
*quote_via* parameter.
|
|
|
|
|
|
.. seealso::
|
|
|
|
`WHATWG`_ - URL Living standard
|
|
Working Group for the URL Standard that defines URLs, domains, IP addresses, the
|
|
application/x-www-form-urlencoded format, and their API.
|
|
|
|
:rfc:`3986` - Uniform Resource Identifiers
|
|
This is the current standard (STD66). Any changes to urllib.parse module
|
|
should conform to this. Certain deviations could be observed, which are
|
|
mostly for backward compatibility purposes and for certain de-facto
|
|
parsing requirements as commonly observed in major browsers.
|
|
|
|
:rfc:`2732` - Format for Literal IPv6 Addresses in URL's.
|
|
This specifies the parsing requirements of IPv6 URLs.
|
|
|
|
:rfc:`2396` - Uniform Resource Identifiers (URI): Generic Syntax
|
|
Document describing the generic syntactic requirements for both Uniform Resource
|
|
Names (URNs) and Uniform Resource Locators (URLs).
|
|
|
|
:rfc:`2368` - The mailto URL scheme.
|
|
Parsing requirements for mailto URL schemes.
|
|
|
|
:rfc:`1808` - Relative Uniform Resource Locators
|
|
This Request For Comments includes the rules for joining an absolute and a
|
|
relative URL, including a fair number of "Abnormal Examples" which govern the
|
|
treatment of border cases.
|
|
|
|
:rfc:`1738` - Uniform Resource Locators (URL)
|
|
This specifies the formal syntax and semantics of absolute URLs.
|
|
|
|
.. _WHATWG: https://url.spec.whatwg.org/
|