mirror of https://github.com/python/cpython
Rewrites and additions resulting from today's feedback
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Andrew M. Kuchling
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5b40f1c212
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433b5c4d34
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@ -50,7 +50,7 @@ features, and was written by Cameron Laird and Kathryn Soraiz.}
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%======================================================================
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\section{PEP 252: Type and Class Changes}
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\section{PEPs 252 and 253: Type and Class Changes}
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The largest and most far-reaching changes in Python 2.2 are to
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Python's model of objects and classes. The changes should be backward
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@ -334,6 +334,8 @@ Following this rule, referring to \method{D.save()} will return
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\method{C.save()}, which is the behaviour we're after. This lookup
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rule is the same as the one followed by Common Lisp.
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% XXX mention super()
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\subsection{Attribute Access}
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@ -871,22 +873,21 @@ Python's Unicode support has been enhanced a bit in 2.2. Unicode
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strings are usually stored as UCS-2, as 16-bit unsigned integers.
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Python 2.2 can also be compiled to use UCS-4, 32-bit unsigned
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integers, as its internal encoding by supplying
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\longprogramopt{enable-unicode=ucs4} to the configure script. When
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built to use UCS-4 (a ``wide Python''), the interpreter can natively
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handle Unicode characters from U+000000 to U+110000, so the range of
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legal values for the \function{unichr()} function is expanded
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\longprogramopt{enable-unicode=ucs4} to the configure script.
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(It's also possible to specify
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\longprogramopt{disable-unicode} to completely disable Unicode
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support.)
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When built to use UCS-4 (a ``wide Python''), the interpreter can
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natively handle Unicode characters from U+000000 to U+110000, so the
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range of legal values for the \function{unichr()} function is expanded
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accordingly. Using an interpreter compiled to use UCS-2 (a ``narrow
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Python''), values greater than 65535 will still cause
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\function{unichr()} to raise a \exception{ValueError} exception.
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This is all described in \pep{261}, ``Support for `wide' Unicode
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characters''; consult it for further details.
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% XXX is this still unimplemented?
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All this is the province of the still-unimplemented \pep{261}, ``Support
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for `wide' Unicode characters''; consult it for further details, and
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please offer comments on the PEP and on your experiences with the
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2.2 beta releases.
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% XXX update previous line once 2.2 reaches beta or final.
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Another change is much simpler to explain. Since their introduction,
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Another change is simpler to explain. Since their introduction,
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Unicode strings have supported an \method{encode()} method to convert
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the string to a selected encoding such as UTF-8 or Latin-1. A
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symmetric \method{decode(\optional{\var{encoding}})} method has been
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@ -928,8 +929,8 @@ L\"owis.
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\begin{seealso}
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\seepep{261}{Support for `wide' Unicode characters}{PEP written by
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Paul Prescod. Not yet accepted or fully implemented.}
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\seepep{261}{Support for `wide' Unicode characters}{Written by
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Paul Prescod.}
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\end{seealso}
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@ -1074,8 +1075,25 @@ The \module{SimpleXMLRPCServer} module makes it easy to create
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straightforward XML-RPC servers. See \url{http://www.xmlrpc.com/} for
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more information about XML-RPC.
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\item The new \module{hmac} module implements implements the HMAC
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\item The new \module{hmac} module implements the HMAC
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algorithm described by \rfc{2104}.
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(Contributed by Gerhard H\"aring.)
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\item Several functions that originally returned lengthy tuples now
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return pseudo-sequences that still behave like tuples but also have
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mnemonic attributes such as member{st_mtime} or \member{tm_year}.
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The enhanced functions include \function{stat()},
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\function{fstat()}, \function{statvfs()}, and \function{fstatvfs()}
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in the \module{os} module, and \function{localtime()},
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\function{gmtime()}, and \function{strptime()} in the \module{time}
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module.
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For example, to obtain a file's size using the old tuples, you'd end
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up writing something like \code{file_size =
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os.stat(filename)[stat.ST_SIZE]}, but now this can be written more
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clearly as \code{file_size = os.stat(filename).st_size}.
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The original patch for this feature was contributed by Nick Mathewson.
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\item The Python profiler has been extensively reworked and various
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errors in its output have been corrected. (Contributed by Fred
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@ -1104,20 +1122,25 @@ more information about XML-RPC.
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to the SRE engine underlying the \module{re} module. For example,
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the \function{re.sub()} and \function{re.split()} functions have
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been rewritten in C. Another contributed patch speeds up certain
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Unicode character ranges by a factor of two. (SRE is maintained by
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Unicode character ranges by a factor of two, and a new \method{finditer()}
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method that returns an iterator over all the non-overlapping matches in
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a given string.
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(SRE is maintained by
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Fredrik Lundh. The BIGCHARSET patch was contributed by Martin von
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L\"owis.)
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\item The \module{smtplib} module now supports \rfc{2487}, ``Secure
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SMTP over TLS'', so it's now possible to encrypt the SMTP traffic
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between a Python program and the mail transport agent being handed a
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message. (Contributed by Gerhard H\"aring.)
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message. \module{smtplib} also supports SMTP authentication.
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(Contributed by Gerhard H\"aring.)
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\item The \module{imaplib} module, maintained by Piers Lauder, has
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support for several new extensions: the NAMESPACE extension defined
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in \rfc{2342}, SORT, GETACL and SETACL. (Contributed by Anthony
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Baxter and Michel Pelletier.)
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% XXX should the 'email' module get a section of its own?
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\item The \module{rfc822} module's parsing of email addresses is now
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compliant with \rfc{2822}, an update to \rfc{822}. (The module's
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name is \emph{not} going to be changed to \samp{rfc2822}.) A new
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@ -1302,9 +1325,10 @@ to experiment with these modules can uncomment them manually.
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now convert it to an MBCS encoded string, as used by the Microsoft
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file APIs. As MBCS is explicitly used by the file APIs, Python's
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choice of ASCII as the default encoding turns out to be an
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annoyance.
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(Contributed by Mark Hammond with assistance from Marc-Andr\'e
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Lemburg.)
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annoyance. On Unix, the locale's character set is used if
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\function{locale.nl_langinfo(CODESET)} is available. (Windows
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support was contributed by Mark Hammond with assistance from
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Marc-Andr\'e Lemburg. Unix support was added by Martin von L\"owis.)
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\item Large file support is now enabled on Windows. (Contributed by
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Tim Peters.)
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@ -1371,8 +1395,9 @@ to experiment with these modules can uncomment them manually.
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The author would like to thank the following people for offering
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suggestions, corrections and assistance with various drafts of this
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article: Fred Bremmer, Keith Briggs, Andrew Dalke, Fred~L. Drake, Jr.,
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Carel Fellinger, Mark Hammond, Stephen Hansen, Michael Hudson, Jack Jansen,
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Marc-Andr\'e Lemburg, Fredrik Lundh, Michael McLay, Tim Peters, Jens
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Quade, Tom Reinhardt, Neil Schemenauer, Guido van Rossum.
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Carel Fellinger, Mark Hammond, Stephen Hansen, Michael Hudson, Jack
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Jansen, Marc-Andr\'e Lemburg, Martin von L\"owis, Fredrik Lundh,
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Michael McLay, Nick Mathewson, Paul Moore, Tim Peters, Jens Quade, Tom
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Reinhardt, Neil Schemenauer, Guido van Rossum.
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\end{document}
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