Update versions and dates; add PEP 328

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Andrew M. Kuchling 2004-08-31 11:26:23 +00:00
parent 17952b78e1
commit 3294e9d2e7
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\maketitle
\tableofcontents
This article explains the new features in Python 2.4 alpha2, scheduled
for release in late July 2004. The final version of Python 2.4 is
expected to be released around September 2004.
This article explains the new features in Python 2.4 alpha3, scheduled
for release in early September. The final version of Python 2.4 is
expected to be released around December 2004.
Python 2.4 is a medium-sized release. It doesn't introduce as many
changes as the radical Python 2.2, but introduces more features than
the conservative 2.3 release did. The most significant new language
feature (as of this writing) is the addition of generator expressions;
most other changes are to the standard library.
features (as of this writing) are function decorators and generator
expressions; most other changes are to the standard library.
This article doesn't attempt to provide a complete specification of
every single new feature, but instead provides a convenient overview.
@ -658,6 +658,42 @@ Rexx language.}
\end{seealso}
%======================================================================
\section{PEP 328: Multi-line Imports}
One language change is a small syntactic tweak aimed at making it
easier to import many names from a module. In a
\code{from \var{module} import \var{names}} statement,
\var{names} is a sequence of names separated by commas. If the sequence is
very long, you can either write multiple imports from the same module,
or you can use backslashes to escape the line endings:
\begin{verbatim}
from SimpleXMLRPCServer import SimpleXMLRPCServer,\
SimpleXMLRPCRequestHandler,\
CGIXMLRPCRequestHandler,\
resolve_dotted_attribute
\end{verbatim}
The syntactic change simply allows putting the names within
parentheses. Python ignores newlines within a parenthesized
expression, so the backslashes are no longer needed:
\begin{verbatim}
from SimpleXMLRPCServer import (SimpleXMLRPCServer,
SimpleXMLRPCRequestHandler,
CGIXMLRPCRequestHandler,
resolve_dotted_attribute)
\end{verbatim}
The PEP also proposes that all \keyword{import} statements be
absolute imports, with a leading \samp{.} character to indicate a
relative import. This part of the PEP is not yet implemented.
\begin{seealso}
\seepep{328}{Imports: Multi-Line and Absolute/Relative}{Written by Aahz. Multi-line imports were implemented by Dima Dorfman.}
%======================================================================
\section{PEP 331: Locale-Independent Float/String Conversions}