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Update version of What's New

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Andrew M. Kuchling 2007-01-22 15:14:15 +00:00
parent bb6a0edce1
commit e69747c630
1 changed files with 27 additions and 17 deletions
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Doc/whatsnew/whatsnew25.tex
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@ -5,7 +5,7 @@
% Fix XXX comments % Fix XXX comments
\title{What's New in Python 2.5} \title{What's New in Python 2.5}
\release{1.0} \release{1.01}
\author{A.M. Kuchling} \author{A.M. Kuchling}
\authoraddress{\email{amk@amk.ca}} \authoraddress{\email{amk@amk.ca}}
@ -409,7 +409,7 @@ is always executed, or one or more \keyword{except} blocks to catch
specific exceptions. You couldn't combine both \keyword{except} blocks and a specific exceptions. You couldn't combine both \keyword{except} blocks and a
\keyword{finally} block, because generating the right bytecode for the \keyword{finally} block, because generating the right bytecode for the
combined version was complicated and it wasn't clear what the combined version was complicated and it wasn't clear what the
semantics of the combined should be. semantics of the combined statement should be.
Guido van~Rossum spent some time working with Java, which does support the Guido van~Rossum spent some time working with Java, which does support the
equivalent of combining \keyword{except} blocks and a equivalent of combining \keyword{except} blocks and a
@ -556,13 +556,14 @@ generators:
where the generator's execution is paused. where the generator's execution is paused.
\item \method{close()} raises a new \exception{GeneratorExit} \item \method{close()} raises a new \exception{GeneratorExit}
exception inside the generator to terminate the iteration. exception inside the generator to terminate the iteration. On
On receiving this receiving this exception, the generator's code must either raise
exception, the generator's code must either raise \exception{GeneratorExit} or \exception{StopIteration}. Catching
\exception{GeneratorExit} or \exception{StopIteration}; catching the the \exception{GeneratorExit} exception and returning a value is
exception and doing anything else is illegal and will trigger illegal and will trigger a \exception{RuntimeError}; if the function
a \exception{RuntimeError}. \method{close()} will also be called by raises some other exception, that exception is propagated to the
Python's garbage collector when the generator is garbage-collected. caller. \method{close()} will also be called by Python's garbage
collector when the generator is garbage-collected.
If you need to run cleanup code when a \exception{GeneratorExit} occurs, If you need to run cleanup code when a \exception{GeneratorExit} occurs,
I suggest using a \code{try: ... finally:} suite instead of I suggest using a \code{try: ... finally:} suite instead of
@ -1663,6 +1664,13 @@ single number as \file{pystone.py} does.
\item The \module{pyexpat} module now uses version 2.0 of the Expat parser. \item The \module{pyexpat} module now uses version 2.0 of the Expat parser.
(Contributed by Trent Mick.) (Contributed by Trent Mick.)
\item The \class{Queue} class provided by the \module{Queue} module
gained two new methods. \method{join()} blocks until all items in
the queue have been retrieved and all processing work on the items
have been completed. Worker threads call the other new method,
\method{task_done()}, to signal that processing for an item has been
completed. (Contributed by Raymond Hettinger.)
\item The old \module{regex} and \module{regsub} modules, which have been \item The old \module{regex} and \module{regsub} modules, which have been
deprecated ever since Python 2.0, have finally been deleted. deprecated ever since Python 2.0, have finally been deleted.
Other deleted modules: \module{statcache}, \module{tzparse}, Other deleted modules: \module{statcache}, \module{tzparse},
@ -2116,14 +2124,16 @@ The pysqlite module (\url{http://www.pysqlite.org}), a wrapper for the
SQLite embedded database, has been added to the standard library under SQLite embedded database, has been added to the standard library under
the package name \module{sqlite3}. the package name \module{sqlite3}.
SQLite is a C library that provides a SQL-language database that SQLite is a C library that provides a lightweight disk-based database
stores data in disk files without requiring a separate server process. that doesn't require a separate server process and allows accessing
the database using a nonstandard variant of the SQL query language.
Some applications can use SQLite for internal data storage. It's also
possible to prototype an application using SQLite and then port the
code to a larger database such as PostgreSQL or Oracle.
pysqlite was written by Gerhard H\"aring and provides a SQL interface pysqlite was written by Gerhard H\"aring and provides a SQL interface
compliant with the DB-API 2.0 specification described by compliant with the DB-API 2.0 specification described by
\pep{249}. This means that it should be possible to write the first \pep{249}.
version of your applications using SQLite for data storage. If
switching to a larger database such as PostgreSQL or Oracle is
later necessary, the switch should be relatively easy.
If you're compiling the Python source yourself, note that the source If you're compiling the Python source yourself, note that the source
tree doesn't include the SQLite code, only the wrapper module. tree doesn't include the SQLite code, only the wrapper module.
@ -2150,8 +2160,8 @@ c = conn.cursor()
# Create table # Create table
c.execute('''create table stocks c.execute('''create table stocks
(date timestamp, trans varchar, symbol varchar, (date text, trans text, symbol text,
qty decimal, price decimal)''') qty real, price real)''')
# Insert a row of data # Insert a row of data
c.execute("""insert into stocks c.execute("""insert into stocks