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msgid ":mod:`!codecs` --- Codec registry and base classes"

msgstr ""

msgid "**Source code:** :source:`Lib/codecs.py`"

msgstr ""

msgid "This module defines base classes for standard Python codecs (encoders and decoders) and provides access to the internal Python codec registry, which manages the codec and error handling lookup process. Most standard codecs are :term:`text encodings <text encoding>`, which encode text to bytes (and decode bytes to text), but there are also codecs provided that encode text to text, and bytes to bytes. Custom codecs may encode and decode between arbitrary types, but some module features are restricted to be used specifically with :term:`text encodings <text encoding>` or with codecs that encode to :class:`bytes`."

msgstr ""

msgid "The module defines the following functions for encoding and decoding with any codec:"

msgstr ""

msgid "Encodes *obj* using the codec registered for *encoding*."

msgstr ""

msgid "*Errors* may be given to set the desired error handling scheme. The default error handler is ``'strict'`` meaning that encoding errors raise :exc:`ValueError` (or a more codec specific subclass, such as :exc:`UnicodeEncodeError`). Refer to :ref:`codec-base-classes` for more information on codec error handling."

msgstr ""

msgid "Decodes *obj* using the codec registered for *encoding*."

msgstr ""

msgid "*Errors* may be given to set the desired error handling scheme. The default error handler is ``'strict'`` meaning that decoding errors raise :exc:`ValueError` (or a more codec specific subclass, such as :exc:`UnicodeDecodeError`). Refer to :ref:`codec-base-classes` for more information on codec error handling."

msgstr ""

msgid "The full details for each codec can also be looked up directly:"

msgstr ""

msgid "Looks up the codec info in the Python codec registry and returns a :class:`CodecInfo` object as defined below."

msgstr ""

msgid "Encodings are first looked up in the registry's cache. If not found, the list of registered search functions is scanned. If no :class:`CodecInfo` object is found, a :exc:`LookupError` is raised. Otherwise, the :class:`CodecInfo` object is stored in the cache and returned to the caller."

msgstr ""

msgid "Codec details when looking up the codec registry. The constructor arguments are stored in attributes of the same name:"

msgstr ""

msgid "The name of the encoding."

msgstr ""

msgid "The stateless encoding and decoding functions. These must be functions or methods which have the same interface as the :meth:`~Codec.encode` and :meth:`~Codec.decode` methods of Codec instances (see :ref:`Codec Interface <codec-objects>`). The functions or methods are expected to work in a stateless mode."

msgstr ""

msgid "Incremental encoder and decoder classes or factory functions. These have to provide the interface defined by the base classes :class:`IncrementalEncoder` and :class:`IncrementalDecoder`, respectively. Incremental codecs can maintain state."

msgstr ""

msgid "Stream writer and reader classes or factory functions. These have to provide the interface defined by the base classes :class:`StreamWriter` and :class:`StreamReader`, respectively. Stream codecs can maintain state."

msgstr ""

msgid "To simplify access to the various codec components, the module provides these additional functions which use :func:`lookup` for the codec lookup:"

msgstr ""

msgid "Look up the codec for the given encoding and return its encoder function."

msgstr ""

msgid "Raises a :exc:`LookupError` in case the encoding cannot be found."

msgstr ""

msgid "Look up the codec for the given encoding and return its decoder function."

msgstr ""

msgid "Look up the codec for the given encoding and return its incremental encoder class or factory function."

msgstr ""

msgid "Raises a :exc:`LookupError` in case the encoding cannot be found or the codec doesn't support an incremental encoder."

msgstr ""

msgid "Look up the codec for the given encoding and return its incremental decoder class or factory function."

msgstr ""

msgid "Raises a :exc:`LookupError` in case the encoding cannot be found or the codec doesn't support an incremental decoder."

msgstr ""

msgid "Look up the codec for the given encoding and return its :class:`StreamReader` class or factory function."

msgstr ""

msgid "Look up the codec for the given encoding and return its :class:`StreamWriter` class or factory function."

msgstr ""

msgid "Custom codecs are made available by registering a suitable codec search function:"

msgstr ""

msgid "Register a codec search function. Search functions are expected to take one argument, being the encoding name in all lower case letters with hyphens and spaces converted to underscores, and return a :class:`CodecInfo` object. In case a search function cannot find a given encoding, it should return ``None``."

msgstr ""

msgid "Hyphens and spaces are converted to underscore."

msgstr ""

msgid "Unregister a codec search function and clear the registry's cache. If the search function is not registered, do nothing."

msgstr ""

msgid "While the builtin :func:`open` and the associated :mod:`io` module are the recommended approach for working with encoded text files, this module provides additional utility functions and classes that allow the use of a wider range of codecs when working with binary files:"

msgstr ""

msgid "Open an encoded file using the given *mode* and return an instance of :class:`StreamReaderWriter`, providing transparent encoding/decoding. The default file mode is ``'r'``, meaning to open the file in read mode."

msgstr ""

msgid "If *encoding* is not ``None``, then the underlying encoded files are always opened in binary mode. No automatic conversion of ``'\\n'`` is done on reading and writing. The *mode* argument may be any binary mode acceptable to the built-in :func:`open` function; the ``'b'`` is automatically added."

msgstr ""

msgid "*encoding* specifies the encoding which is to be used for the file. Any encoding that encodes to and decodes from bytes is allowed, and the data types supported by the file methods depend on the codec used."

msgstr ""

msgid "*errors* may be given to define the error handling. It defaults to ``'strict'`` which causes a :exc:`ValueError` to be raised in case an encoding error occurs."

msgstr ""

msgid "*buffering* has the same meaning as for the built-in :func:`open` function. It defaults to -1 which means that the default buffer size will be used."

msgstr ""

msgid "The ``'U'`` mode has been removed."

msgstr ""

msgid "Return a :class:`StreamRecoder` instance, a wrapped version of *file* which provides transparent transcoding. The original file is closed when the wrapped version is closed."

msgstr ""

msgid "Data written to the wrapped file is decoded according to the given *data_encoding* and then written to the original file as bytes using *file_encoding*. Bytes read from the original file are decoded according to *file_encoding*, and the result is encoded using *data_encoding*."

msgstr ""

msgid "If *file_encoding* is not given, it defaults to *data_encoding*."

msgstr ""

msgid "*errors* may be given to define the error handling. It defaults to ``'strict'``, which causes :exc:`ValueError` to be raised in case an encoding error occurs."

msgstr ""

msgid "Uses an incremental encoder to iteratively encode the input provided by *iterator*. This function is a :term:`generator`. The *errors* argument (as well as any other keyword argument) is passed through to the incremental encoder."

msgstr ""

msgid "This function requires that the codec accept text :class:`str` objects to encode. Therefore it does not support bytes-to-bytes encoders such as ``base64_codec``."

msgstr ""

msgid "Uses an incremental decoder to iteratively decode the input provided by *iterator*. This function is a :term:`generator`. The *errors* argument (as well as any other keyword argument) is passed through to the incremental decoder."

msgstr ""

msgid "This function requires that the codec accept :class:`bytes` objects to decode. Therefore it does not support text-to-text encoders such as ``rot_13``, although ``rot_13`` may be used equivalently with :func:`iterencode`."

msgstr ""

msgid "The module also provides the following constants which are useful for reading and writing to platform dependent files:"

msgstr ""

msgid "These constants define various byte sequences, being Unicode byte order marks (BOMs) for several encodings. They are used in UTF-16 and UTF-32 data streams to indicate the byte order used, and in UTF-8 as a Unicode signature. :const:`BOM_UTF16` is either :const:`BOM_UTF16_BE` or :const:`BOM_UTF16_LE` depending on the platform's native byte order, :const:`BOM` is an alias for :const:`BOM_UTF16`, :const:`BOM_LE` for :const:`BOM_UTF16_LE` and :const:`BOM_BE` for :const:`BOM_UTF16_BE`. The others represent the BOM in UTF-8 and UTF-32 encodings."

msgstr ""

msgid "Codec Base Classes"

msgstr ""

msgid "The :mod:`codecs` module defines a set of base classes which define the interfaces for working with codec objects, and can also be used as the basis for custom codec implementations."

msgstr ""

msgid "Each codec has to define four interfaces to make it usable as codec in Python: stateless encoder, stateless decoder, stream reader and stream writer. The stream reader and writers typically reuse the stateless encoder/decoder to implement the file protocols. Codec authors also need to define how the codec will handle encoding and decoding errors."

msgstr ""

msgid "Error Handlers"

msgstr ""

msgid "To simplify and standardize error handling, codecs may implement different error handling schemes by accepting the *errors* string argument:"

msgstr ""

msgid "The following error handlers can be used with all Python :ref:`standard-encodings` codecs:"

msgstr ""

msgid "Value"

msgstr ""

msgid "Meaning"

msgstr ""

msgid "``'strict'``"

msgstr ""

msgid "Raise :exc:`UnicodeError` (or a subclass), this is the default. Implemented in :func:`strict_errors`."

msgstr ""

msgid "``'ignore'``"

msgstr ""

msgid "Ignore the malformed data and continue without further notice. Implemented in :func:`ignore_errors`."

msgstr ""

msgid "``'replace'``"

msgstr ""

msgid "Replace with a replacement marker. On encoding, use ``?`` (ASCII character). On decoding, use ``�`` (U+FFFD, the official REPLACEMENT CHARACTER). Implemented in :func:`replace_errors`."

msgstr ""

msgid "``'backslashreplace'``"

msgstr ""

msgid "Replace with backslashed escape sequences. On encoding, use hexadecimal form of Unicode code point with formats :samp:`\\\\x{hh}` :samp:`\\\\u{xxxx}` :samp:`\\\\U{xxxxxxxx}`. On decoding, use hexadecimal form of byte value with format :samp:`\\\\x{hh}`. Implemented in :func:`backslashreplace_errors`."

msgstr ""

msgid "``'surrogateescape'``"

msgstr ""

msgid "On decoding, replace byte with individual surrogate code ranging from ``U+DC80`` to ``U+DCFF``. This code will then be turned back into the same byte when the ``'surrogateescape'`` error handler is used when encoding the data. (See :pep:`383` for more.)"

msgstr ""

msgid "The following error handlers are only applicable to encoding (within :term:`text encodings <text encoding>`):"

msgstr ""

msgid "``'xmlcharrefreplace'``"

msgstr ""

msgid "Replace with XML/HTML numeric character reference, which is a decimal form of Unicode code point with format :samp:`&#{num};`. Implemented in :func:`xmlcharrefreplace_errors`."

msgstr ""

msgid "``'namereplace'``"

msgstr ""

msgid "Replace with ``\\N{...}`` escape sequences, what appears in the braces is the Name property from Unicode Character Database. Implemented in :func:`namereplace_errors`."

msgstr ""

msgid "In addition, the following error handler is specific to the given codecs:"

msgstr ""

msgid "Codecs"

msgstr ""

msgid "``'surrogatepass'``"

msgstr ""

msgid "utf-8, utf-16, utf-32, utf-16-be, utf-16-le, utf-32-be, utf-32-le"

msgstr ""

msgid "Allow encoding and decoding surrogate code point (``U+D800`` - ``U+DFFF``) as normal code point. Otherwise these codecs treat the presence of surrogate code point in :class:`str` as an error."

msgstr ""

msgid "The ``'surrogateescape'`` and ``'surrogatepass'`` error handlers."

msgstr ""

msgid "The ``'surrogatepass'`` error handler now works with utf-16\\* and utf-32\\* codecs."

msgstr ""

msgid "The ``'namereplace'`` error handler."

msgstr ""

msgid "The ``'backslashreplace'`` error handler now works with decoding and translating."

msgstr ""

msgid "The set of allowed values can be extended by registering a new named error handler:"

msgstr ""

msgid "Register the error handling function *error_handler* under the name *name*. The *error_handler* argument will be called during encoding and decoding in case of an error, when *name* is specified as the errors parameter."

msgstr ""

msgid "For encoding, *error_handler* will be called with a :exc:`UnicodeEncodeError` instance, which contains information about the location of the error. The error handler must either raise this or a different exception, or return a tuple with a replacement for the unencodable part of the input and a position where encoding should continue. The replacement may be either :class:`str` or :class:`bytes`. If the replacement is bytes, the encoder will simply copy them into the output buffer. If the replacement is a string, the encoder will encode the replacement. Encoding continues on original input at the specified position. Negative position values will be treated as being relative to the end of the input string. If the resulting position is out of bound an :exc:`IndexError` will be raised."

msgstr ""

msgid "Decoding and translating works similarly, except :exc:`UnicodeDecodeError` or :exc:`UnicodeTranslateError` will be passed to the handler and that the replacement from the error handler will be put into the output directly."

msgstr ""

msgid "Previously registered error handlers (including the standard error handlers) can be looked up by name:"

msgstr ""

msgid "Return the error handler previously registered under the name *name*."

msgstr ""

msgid "Raises a :exc:`LookupError` in case the handler cannot be found."

msgstr ""

msgid "The following standard error handlers are also made available as module level functions:"

msgstr ""

msgid "Implements the ``'strict'`` error handling."

msgstr ""

msgid "Each encoding or decoding error raises a :exc:`UnicodeError`."

msgstr ""

msgid "Implements the ``'ignore'`` error handling."

msgstr ""

msgid "Malformed data is ignored; encoding or decoding is continued without further notice."

msgstr ""

msgid "Implements the ``'replace'`` error handling."

msgstr ""

msgid "Substitutes ``?`` (ASCII character) for encoding errors or ``�`` (U+FFFD, the official REPLACEMENT CHARACTER) for decoding errors."

msgstr ""

msgid "Implements the ``'backslashreplace'`` error handling."

msgstr ""

msgid "Malformed data is replaced by a backslashed escape sequence. On encoding, use the hexadecimal form of Unicode code point with formats :samp:`\\\\x{hh}` :samp:`\\\\u{xxxx}` :samp:`\\\\U{xxxxxxxx}`. On decoding, use the hexadecimal form of byte value with format :samp:`\\\\x{hh}`."

msgstr ""

msgid "Works with decoding and translating."

msgstr ""

msgid "Implements the ``'xmlcharrefreplace'`` error handling (for encoding within :term:`text encoding` only)."

msgstr ""

msgid "The unencodable character is replaced by an appropriate XML/HTML numeric character reference, which is a decimal form of Unicode code point with format :samp:`&#{num};` ."

msgstr ""

msgid "Implements the ``'namereplace'`` error handling (for encoding within :term:`text encoding` only)."

msgstr ""

msgid "The unencodable character is replaced by a ``\\N{...}`` escape sequence. The set of characters that appear in the braces is the Name property from Unicode Character Database. For example, the German lowercase letter ``'ß'`` will be converted to byte sequence ``\\N{LATIN SMALL LETTER SHARP S}`` ."

msgstr ""

msgid "Stateless Encoding and Decoding"

msgstr ""

msgid "The base :class:`Codec` class defines these methods which also define the function interfaces of the stateless encoder and decoder:"

msgstr ""

msgid "Encodes the object *input* and returns a tuple (output object, length consumed). For instance, :term:`text encoding` converts a string object to a bytes object using a particular character set encoding (e.g., ``cp1252`` or ``iso-8859-1``)."

msgstr ""

msgid "The *errors* argument defines the error handling to apply. It defaults to ``'strict'`` handling."

msgstr ""

msgid "The method may not store state in the :class:`Codec` instance. Use :class:`StreamWriter` for codecs which have to keep state in order to make encoding efficient."

msgstr ""

msgid "The encoder must be able to handle zero length input and return an empty object of the output object type in this situation."

msgstr ""

msgid "Decodes the object *input* and returns a tuple (output object, length consumed). For instance, for a :term:`text encoding`, decoding converts a bytes object encoded using a particular character set encoding to a string object."

msgstr ""

msgid "For text encodings and bytes-to-bytes codecs, *input* must be a bytes object or one which provides the read-only buffer interface -- for example, buffer objects and memory mapped files."

msgstr ""

msgid "The method may not store state in the :class:`Codec` instance. Use :class:`StreamReader` for codecs which have to keep state in order to make decoding efficient."

msgstr ""

msgid "The decoder must be able to handle zero length input and return an empty object of the output object type in this situation."

msgstr ""

msgid "Incremental Encoding and Decoding"

msgstr ""

msgid "The :class:`IncrementalEncoder` and :class:`IncrementalDecoder` classes provide the basic interface for incremental encoding and decoding. Encoding/decoding the input isn't done with one call to the stateless encoder/decoder function, but with multiple calls to the :meth:`~IncrementalEncoder.encode`/:meth:`~IncrementalDecoder.decode` method of the incremental encoder/decoder. The incremental encoder/decoder keeps track of the encoding/decoding process during method calls."

msgstr ""

msgid "The joined output of calls to the :meth:`~IncrementalEncoder.encode`/:meth:`~IncrementalDecoder.decode` method is the same as if all the single inputs were joined into one, and this input was encoded/decoded with the stateless encoder/decoder."

msgstr ""

msgid "IncrementalEncoder Objects"

msgstr ""

msgid "The :class:`IncrementalEncoder` class is used for encoding an input in multiple steps. It defines the following methods which every incremental encoder must define in order to be compatible with the Python codec registry."

msgstr ""

msgid "Constructor for an :class:`IncrementalEncoder` instance."

msgstr ""

msgid "All incremental encoders must provide this constructor interface. They are free to add additional keyword arguments, but only the ones defined here are used by the Python codec registry."

msgstr ""

msgid "The :class:`IncrementalEncoder` may implement different error handling schemes by providing the *errors* keyword argument. See :ref:`error-handlers` for possible values."

msgstr ""

msgid "The *errors* argument will be assigned to an attribute of the same name. Assigning to this attribute makes it possible to switch between different error handling strategies during the lifetime of the :class:`IncrementalEncoder` object."

msgstr ""

msgid "Encodes *object* (taking the current state of the encoder into account) and returns the resulting encoded object. If this is the last call to :meth:`encode` *final* must be true (the default is false)."

msgstr ""

msgid "Reset the encoder to the initial state. The output is discarded: call ``.encode(object, final=True)``, passing an empty byte or text string if necessary, to reset the encoder and to get the output."

msgstr ""

msgid "Return the current state of the encoder which must be an integer. The implementation should make sure that ``0`` is the most common state. (States that are more complicated than integers can be converted into an integer by marshaling/pickling the state and encoding the bytes of the resulting string into an integer.)"

msgstr ""

msgid "Set the state of the encoder to *state*. *state* must be an encoder state returned by :meth:`getstate`."

msgstr ""

msgid "IncrementalDecoder Objects"

msgstr ""

msgid "The :class:`IncrementalDecoder` class is used for decoding an input in multiple steps. It defines the following methods which every incremental decoder must define in order to be compatible with the Python codec registry."

msgstr ""

msgid "Constructor for an :class:`IncrementalDecoder` instance."

msgstr ""

msgid "All incremental decoders must provide this constructor interface. They are free to add additional keyword arguments, but only the ones defined here are used by the Python codec registry."

msgstr ""

msgid "The :class:`IncrementalDecoder` may implement different error handling schemes by providing the *errors* keyword argument. See :ref:`error-handlers` for possible values."

msgstr ""

msgid "The *errors* argument will be assigned to an attribute of the same name. Assigning to this attribute makes it possible to switch between different error handling strategies during the lifetime of the :class:`IncrementalDecoder` object."

msgstr ""

msgid "Decodes *object* (taking the current state of the decoder into account) and returns the resulting decoded object. If this is the last call to :meth:`decode` *final* must be true (the default is false). If *final* is true the decoder must decode the input completely and must flush all buffers. If this isn't possible (e.g. because of incomplete byte sequences at the end of the input) it must initiate error handling just like in the stateless case (which might raise an exception)."

msgstr ""

msgid "Reset the decoder to the initial state."

msgstr ""

msgid "Return the current state of the decoder. This must be a tuple with two items, the first must be the buffer containing the still undecoded input. The second must be an integer and can be additional state info. (The implementation should make sure that ``0`` is the most common additional state info.) If this additional state info is ``0`` it must be possible to set the decoder to the state which has no input buffered and ``0`` as the additional state info, so that feeding the previously buffered input to the decoder returns it to the previous state without producing any output. (Additional state info that is more complicated than integers can be converted into an integer by marshaling/pickling the info and encoding the bytes of the resulting string into an integer.)"

msgstr ""

msgid "Set the state of the decoder to *state*. *state* must be a decoder state returned by :meth:`getstate`."

msgstr ""

msgid "Stream Encoding and Decoding"

msgstr ""

msgid "The :class:`StreamWriter` and :class:`StreamReader` classes provide generic working interfaces which can be used to implement new encoding submodules very easily. See :mod:`!encodings.utf_8` for an example of how this is done."

msgstr ""

msgid "StreamWriter Objects"

msgstr ""

msgid "The :class:`StreamWriter` class is a subclass of :class:`Codec` and defines the following methods which every stream writer must define in order to be compatible with the Python codec registry."

msgstr ""

msgid "Constructor for a :class:`StreamWriter` instance."

msgstr ""

msgid "All stream writers must provide this constructor interface. They are free to add additional keyword arguments, but only the ones defined here are used by the Python codec registry."

msgstr ""

msgid "The *stream* argument must be a file-like object open for writing text or binary data, as appropriate for the specific codec."

msgstr ""

msgid "The :class:`StreamWriter` may implement different error handling schemes by providing the *errors* keyword argument. See :ref:`error-handlers` for the standard error handlers the underlying stream codec may support."

msgstr ""

msgid "The *errors* argument will be assigned to an attribute of the same name. Assigning to this attribute makes it possible to switch between different error handling strategies during the lifetime of the :class:`StreamWriter` object."

msgstr ""

msgid "Writes the object's contents encoded to the stream."

msgstr ""

msgid "Writes the concatenated iterable of strings to the stream (possibly by reusing the :meth:`write` method). Infinite or very large iterables are not supported. The standard bytes-to-bytes codecs do not support this method."

msgstr ""

msgid "Resets the codec buffers used for keeping internal state."

msgstr ""

msgid "Calling this method should ensure that the data on the output is put into a clean state that allows appending of new fresh data without having to rescan the whole stream to recover state."

msgstr ""

msgid "In addition to the above methods, the :class:`StreamWriter` must also inherit all other methods and attributes from the underlying stream."

msgstr ""

msgid "StreamReader Objects"

msgstr ""

msgid "The :class:`StreamReader` class is a subclass of :class:`Codec` and defines the following methods which every stream reader must define in order to be compatible with the Python codec registry."

msgstr ""

msgid "Constructor for a :class:`StreamReader` instance."

msgstr ""

msgid "All stream readers must provide this constructor interface. They are free to add additional keyword arguments, but only the ones defined here are used by the Python codec registry."

msgstr ""

msgid "The *stream* argument must be a file-like object open for reading text or binary data, as appropriate for the specific codec."

msgstr ""

msgid "The :class:`StreamReader` may implement different error handling schemes by providing the *errors* keyword argument. See :ref:`error-handlers` for the standard error handlers the underlying stream codec may support."

msgstr ""

msgid "The *errors* argument will be assigned to an attribute of the same name. Assigning to this attribute makes it possible to switch between different error handling strategies during the lifetime of the :class:`StreamReader` object."

msgstr ""

msgid "The set of allowed values for the *errors* argument can be extended with :func:`register_error`."

msgstr ""

msgid "Decodes data from the stream and returns the resulting object."

msgstr ""

msgid "The *chars* argument indicates the number of decoded code points or bytes to return. The :func:`read` method will never return more data than requested, but it might return less, if there is not enough available."

msgstr ""

msgid "The *size* argument indicates the approximate maximum number of encoded bytes or code points to read for decoding. The decoder can modify this setting as appropriate. The default value -1 indicates to read and decode as much as possible. This parameter is intended to prevent having to decode huge files in one step."

msgstr ""

msgid "The *firstline* flag indicates that it would be sufficient to only return the first line, if there are decoding errors on later lines."

msgstr ""

msgid "The method should use a greedy read strategy meaning that it should read as much data as is allowed within the definition of the encoding and the given size, e.g. if optional encoding endings or state markers are available on the stream, these should be read too."

msgstr ""

msgid "Read one line from the input stream and return the decoded data."

msgstr ""

msgid "*size*, if given, is passed as size argument to the stream's :meth:`read` method."

msgstr ""

msgid "If *keepends* is false line-endings will be stripped from the lines returned."

msgstr ""

msgid "Read all lines available on the input stream and return them as a list of lines."

msgstr ""

msgid "Line-endings are implemented using the codec's :meth:`decode` method and are included in the list entries if *keepends* is true."

msgstr ""

msgid "*sizehint*, if given, is passed as the *size* argument to the stream's :meth:`read` method."

msgstr ""

msgid "Note that no stream repositioning should take place. This method is primarily intended to be able to recover from decoding errors."

msgstr ""

msgid "In addition to the above methods, the :class:`StreamReader` must also inherit all other methods and attributes from the underlying stream."

msgstr ""

msgid "StreamReaderWriter Objects"

msgstr ""

msgid "The :class:`StreamReaderWriter` is a convenience class that allows wrapping streams which work in both read and write modes."

msgstr ""

msgid "The design is such that one can use the factory functions returned by the :func:`lookup` function to construct the instance."

msgstr ""

msgid "Creates a :class:`StreamReaderWriter` instance. *stream* must be a file-like object. *Reader* and *Writer* must be factory functions or classes providing the :class:`StreamReader` and :class:`StreamWriter` interface resp. Error handling is done in the same way as defined for the stream readers and writers."

msgstr ""

msgid ":class:`StreamReaderWriter` instances define the combined interfaces of :class:`StreamReader` and :class:`StreamWriter` classes. They inherit all other methods and attributes from the underlying stream."

msgstr ""

msgid "StreamRecoder Objects"

msgstr ""

msgid "The :class:`StreamRecoder` translates data from one encoding to another, which is sometimes useful when dealing with different encoding environments."

msgstr ""

msgid "Creates a :class:`StreamRecoder` instance which implements a two-way conversion: *encode* and *decode* work on the frontend — the data visible to code calling :meth:`~StreamReader.read` and :meth:`~StreamWriter.write`, while *Reader* and *Writer* work on the backend — the data in *stream*."

msgstr ""

msgid "You can use these objects to do transparent transcodings, e.g., from Latin-1 to UTF-8 and back."

msgstr ""

msgid "The *stream* argument must be a file-like object."

msgstr ""

msgid "The *encode* and *decode* arguments must adhere to the :class:`Codec` interface. *Reader* and *Writer* must be factory functions or classes providing objects of the :class:`StreamReader` and :class:`StreamWriter` interface respectively."

msgstr ""

msgid "Error handling is done in the same way as defined for the stream readers and writers."

msgstr ""

msgid ":class:`StreamRecoder` instances define the combined interfaces of :class:`StreamReader` and :class:`StreamWriter` classes. They inherit all other methods and attributes from the underlying stream."

msgstr ""

msgid "Encodings and Unicode"

msgstr ""

msgid "Strings are stored internally as sequences of code points in range ``U+0000``--``U+10FFFF``. (See :pep:`393` for more details about the implementation.) Once a string object is used outside of CPU and memory, endianness and how these arrays are stored as bytes become an issue. As with other codecs, serialising a string into a sequence of bytes is known as *encoding*, and recreating the string from the sequence of bytes is known as *decoding*. There are a variety of different text serialisation codecs, which are collectivity referred to as :term:`text encodings <text encoding>`."

msgstr ""

msgid "The simplest text encoding (called ``'latin-1'`` or ``'iso-8859-1'``) maps the code points 0--255 to the bytes ``0x0``--``0xff``, which means that a string object that contains code points above ``U+00FF`` can't be encoded with this codec. Doing so will raise a :exc:`UnicodeEncodeError` that looks like the following (although the details of the error message may differ): ``UnicodeEncodeError: 'latin-1' codec can't encode character '\\u1234' in position 3: ordinal not in range(256)``."

msgstr ""

msgid "There's another group of encodings (the so called charmap encodings) that choose a different subset of all Unicode code points and how these code points are mapped to the bytes ``0x0``--``0xff``. To see how this is done simply open e.g. :file:`encodings/cp1252.py` (which is an encoding that is used primarily on Windows). There's a string constant with 256 characters that shows you which character is mapped to which byte value."

msgstr ""

msgid "All of these encodings can only encode 256 of the 1114112 code points defined in Unicode. A simple and straightforward way that can store each Unicode code point, is to store each code point as four consecutive bytes. There are two possibilities: store the bytes in big endian or in little endian order. These two encodings are called ``UTF-32-BE`` and ``UTF-32-LE`` respectively. Their disadvantage is that if e.g. you use ``UTF-32-BE`` on a little endian machine you will always have to swap bytes on encoding and decoding. ``UTF-32`` avoids this problem: bytes will always be in natural endianness. When these bytes are read by a CPU with a different endianness, then bytes have to be swapped though. To be able to detect the endianness of a ``UTF-16`` or ``UTF-32`` byte sequence, there's the so called BOM (\"Byte Order Mark\"). This is the Unicode character ``U+FEFF``. This character can be prepended to every ``UTF-16`` or ``UTF-32`` byte sequence. The byte swapped version of this character (``0xFFFE``) is an illegal character that may not appear in a Unicode text. So when the first character in a ``UTF-16`` or ``UTF-32`` byte sequence appears to be a ``U+FFFE`` the bytes have to be swapped on decoding. Unfortunately the character ``U+FEFF`` had a second purpose as a ``ZERO WIDTH NO-BREAK SPACE``: a character that has no width and doesn't allow a word to be split. It can e.g. be used to give hints to a ligature algorithm. With Unicode 4.0 using ``U+FEFF`` as a ``ZERO WIDTH NO-BREAK SPACE`` has been deprecated (with ``U+2060`` (``WORD JOINER``) assuming this role). Nevertheless Unicode software still must be able to handle ``U+FEFF`` in both roles: as a BOM it's a device to determine the storage layout of the encoded bytes, and vanishes once the byte sequence has been decoded into a string; as a ``ZERO WIDTH NO-BREAK SPACE`` it's a normal character that will be decoded like any other."

msgstr ""

msgid "There's another encoding that is able to encode the full range of Unicode characters: UTF-8. UTF-8 is an 8-bit encoding, which means there are no issues with byte order in UTF-8. Each byte in a UTF-8 byte sequence consists of two parts: marker bits (the most significant bits) and payload bits. The marker bits are a sequence of zero to four ``1`` bits followed by a ``0`` bit. Unicode characters are encoded like this (with x being payload bits, which when concatenated give the Unicode character):"

msgstr ""

msgid "Range"

msgstr ""

msgid "Encoding"

msgstr ""

msgid "``U-00000000`` ... ``U-0000007F``"

msgstr ""

msgid "0xxxxxxx"

msgstr ""

msgid "``U-00000080`` ... ``U-000007FF``"

msgstr ""

msgid "110xxxxx 10xxxxxx"

msgstr ""

msgid "``U-00000800`` ... ``U-0000FFFF``"

msgstr ""

msgid "1110xxxx 10xxxxxx 10xxxxxx"

msgstr ""

msgid "``U-00010000`` ... ``U-0010FFFF``"

msgstr ""

msgid "11110xxx 10xxxxxx 10xxxxxx 10xxxxxx"

msgstr ""

msgid "The least significant bit of the Unicode character is the rightmost x bit."

msgstr ""

msgid "As UTF-8 is an 8-bit encoding no BOM is required and any ``U+FEFF`` character in the decoded string (even if it's the first character) is treated as a ``ZERO WIDTH NO-BREAK SPACE``."

msgstr ""

msgid "Without external information it's impossible to reliably determine which encoding was used for encoding a string. Each charmap encoding can decode any random byte sequence. However that's not possible with UTF-8, as UTF-8 byte sequences have a structure that doesn't allow arbitrary byte sequences. To increase the reliability with which a UTF-8 encoding can be detected, Microsoft invented a variant of UTF-8 (that Python calls ``\"utf-8-sig\"``) for its Notepad program: Before any of the Unicode characters is written to the file, a UTF-8 encoded BOM (which looks like this as a byte sequence: ``0xef``, ``0xbb``, ``0xbf``) is written. As it's rather improbable that any charmap encoded file starts with these byte values (which would e.g. map to"

msgstr ""

msgid "LATIN SMALL LETTER I WITH DIAERESIS"

msgstr ""

msgid "RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK"

msgstr ""

msgid "INVERTED QUESTION MARK"

msgstr ""

msgid "in iso-8859-1), this increases the probability that a ``utf-8-sig`` encoding can be correctly guessed from the byte sequence. So here the BOM is not used to be able to determine the byte order used for generating the byte sequence, but as a signature that helps in guessing the encoding. On encoding the utf-8-sig codec will write ``0xef``, ``0xbb``, ``0xbf`` as the first three bytes to the file. On decoding ``utf-8-sig`` will skip those three bytes if they appear as the first three bytes in the file. In UTF-8, the use of the BOM is discouraged and should generally be avoided."

msgstr ""

msgid "Standard Encodings"

msgstr ""

msgid "Python comes with a number of codecs built-in, either implemented as C functions or with dictionaries as mapping tables. The following table lists the codecs by name, together with a few common aliases, and the languages for which the encoding is likely used. Neither the list of aliases nor the list of languages is meant to be exhaustive. Notice that spelling alternatives that only differ in case or use a hyphen instead of an underscore are also valid aliases; therefore, e.g. ``'utf-8'`` is a valid alias for the ``'utf_8'`` codec."

msgstr ""

msgid "Some common encodings can bypass the codecs lookup machinery to improve performance. These optimization opportunities are only recognized by CPython for a limited set of (case insensitive) aliases: utf-8, utf8, latin-1, latin1, iso-8859-1, iso8859-1, mbcs (Windows only), ascii, us-ascii, utf-16, utf16, utf-32, utf32, and the same using underscores instead of dashes. Using alternative aliases for these encodings may result in slower execution."

msgstr ""

msgid "Optimization opportunity recognized for us-ascii."

msgstr ""

msgid "Many of the character sets support the same languages. They vary in individual characters (e.g. whether the EURO SIGN is supported or not), and in the assignment of characters to code positions. For the European languages in particular, the following variants typically exist:"

msgstr ""

msgid "an ISO 8859 codeset"

msgstr ""

msgid "a Microsoft Windows code page, which is typically derived from an 8859 codeset, but replaces control characters with additional graphic characters"

msgstr ""

msgid "an IBM EBCDIC code page"

msgstr ""

msgid "an IBM PC code page, which is ASCII compatible"

msgstr ""

msgid "Codec"

msgstr ""

msgid "Aliases"

msgstr ""

msgid "Languages"

msgstr ""

msgid "ascii"

msgstr ""

msgid "646, us-ascii"

msgstr ""

msgid "English"

msgstr ""

msgid "big5"

msgstr ""

msgid "big5-tw, csbig5"

msgstr ""

msgid "Traditional Chinese"

msgstr ""

msgid "big5hkscs"

msgstr ""

msgid "big5-hkscs, hkscs"

msgstr ""

msgid "cp037"

msgstr ""

msgid "IBM037, IBM039"

msgstr ""

msgid "cp273"

msgstr ""

msgid "273, IBM273, csIBM273"

msgstr ""

msgid "German"

msgstr ""

msgid "cp424"

msgstr ""

msgid "EBCDIC-CP-HE, IBM424"

msgstr ""

msgid "Hebrew"

msgstr ""

msgid "cp437"

msgstr ""

msgid "437, IBM437"

msgstr ""

msgid "cp500"

msgstr ""

msgid "EBCDIC-CP-BE, EBCDIC-CP-CH, IBM500"

msgstr ""

msgid "Western Europe"

msgstr ""