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Update datetime section a bit

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Andrew M. Kuchling 2003-03-21 17:23:07 +00:00
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Doc/whatsnew/whatsnew23.tex
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@ -1679,8 +1679,6 @@ Any breakage caused by this change should be reported as a bug.
%======================================================================
\subsection{Date/Time Type}
% XXX This is out-of-date already: timetz and so on have gone away.
Date and time types suitable for expressing timestamps were added as
the \module{datetime} module. The types don't support different
calendars or many fancy features, and just stick to the basics of
@ -1689,17 +1687,15 @@ representing time.
The three primary types are: \class{date}, representing a day, month,
and year; \class{time}, consisting of hour, minute, and second; and
\class{datetime}, which contains all the attributes of both
\class{date} and \class{time}. These basic types don't understand
time zones, but there are subclasses named \class{timetz} and
\class{datetimetz} that do. There's also a
\class{timedelta} class representing a difference between two points
\class{date} and \class{time}. There's also a
\class{timedelta} class representing differences between two points
in time, and time zone logic is implemented by classes inheriting from
the abstract \class{tzinfo} class.
You can create instances of \class{date} and \class{time} by either
supplying keyword arguments to the appropriate constructor,
e.g. \code{datetime.date(year=1972, month=10, day=15)}, or by using
one of a number of class methods. For example, the \method{today()}
one of a number of class methods. For example, the \method{date.today()}
class method returns the current local date.
Once created, instances of the date/time classes are all immutable.
@ -1732,7 +1728,9 @@ datetime.datetime(2001, 12, 30, 12, 15, 38, 827738)
Instances can be compared, hashed, and converted to strings (the
result is the same as that of \method{isoformat()}). \class{date} and
\class{datetime} instances can be subtracted from each other, and
added to \class{timedelta} instances.
added to \class{timedelta} instances. The largest missing feature is
that there's no support for parsing strings and getting back a
\class{date} or \class{datetime}.
For more information, refer to the \ulink{module's reference
documentation}{..//lib/module-datetime.html}.
@ -1823,16 +1821,17 @@ the Getopt SIG.
%======================================================================
\section{Specialized Object Allocator (pymalloc)\label{section-pymalloc}}
An experimental feature added to Python 2.1 was pymalloc, a
specialized object allocator written by Vladimir Marangozov. Pymalloc
is intended to be faster than the system \cfunction{malloc()} and
to have less memory overhead for allocation patterns typical of Python
programs. The allocator uses C's \cfunction{malloc()} function to get
large pools of memory and then fulfills smaller memory requests from
these pools.
Pymalloc, a specialized object allocator written by Vladimir
Marangozov, was a feature added to Python 2.1. Pymalloc is intended
to be faster than the system \cfunction{malloc()} and to have less
memory overhead for allocation patterns typical of Python programs.
The allocator uses C's \cfunction{malloc()} function to get large
pools of memory and then fulfills smaller memory requests from these
pools.
In 2.1 and 2.2, pymalloc was an experimental feature and wasn't
enabled by default; you had to explicitly turn it on by providing the
enabled by default; you had to explicitly enable it when compiling
Python by providing the
\longprogramopt{with-pymalloc} option to the \program{configure}
script. In 2.3, pymalloc has had further enhancements and is now
enabled by default; you'll have to supply