Start the argparse entry.

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Raymond Hettinger 2010-12-05 00:39:18 +00:00
parent 6e35394ed5
commit a5a3554b4d
1 changed files with 30 additions and 7 deletions

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@ -69,9 +69,30 @@ need to be recompiled for every feature release.
.. seealso::
:pep:`384` - PYC Repository Directories
:pep:`384` - Define a Stable ABI
PEP written by Martin von Loewis.
PEP 389: Argparse Command Line Parsing Module
=============================================
A new module for command line parsing, :mod:`argparse`, was introduced to
overcome the limitations of :mod:`optparse` which did not provide support for
positional arguments (not just option), subcommands, required options and other
common patterns of specifying and validatig options.
This module has already has wide-spread success in the community as a
third-party module. Being more fully featured than its predecessor,
:mod:`argparse`, is now the preferred module for command-line processing. The
older module is still being kept available because of the substantial amount of
legacy code that depends on it.
.. XXX add examples that highlight the new features
.. seealso::
:pep:`389` - New Command Line Parsing Module
PEP written by Steven Bethard.
PEP 391: Dictionary Based Configuration for Logging
====================================================
@ -139,7 +160,7 @@ launching and managing calls. The goal of the executors is to make it easier to
use existing tools for making parallel calls. They save the effort needed to
setup a pool of resources, launch the calls, create a results queue, add
time-out handling, and limit the total number of threads, processes, or remote
procedure calls.
procedure calls. adfasdf
Ideally, each application should share a single executor across multiple
components so that process and thread limits can be centrally managed. This
@ -154,14 +175,14 @@ see :ref:`code for computing prime numbers in parallel<processpoolexecutor-examp
.. seealso::
:pep:`3148` - PYC Repository Directories
:pep:`3148` - Futures -- Execute Computations Asynchronously
PEP written by Brain Quinlan.
PEP 3147: PYC Repository Directories
=====================================
Python's scheme for caching bytecode in *.pyc* files did not work well in
Python's scheme for caching bytecode in *.pyc* files did not wosrk well in
environments with multiple python interpreters. If one interpreter encountered
a cached file created by another interpreter, it would recompile the source and
overwrite the cached file, thus losing the benefits of caching.
@ -376,8 +397,6 @@ Some smaller changes made to the core Python language are:
New, Improved, and Deprecated Modules
=====================================
* XXX mention :mod:`argparse`.
* The :mod:`functools` module includes a new decorator for caching function
calls. :func:`functools.lru_cache` can save repeated queries to an external
resource whenever the results are expected to be the same.
@ -418,7 +437,7 @@ New, Improved, and Deprecated Modules
:issue:`8814`.)
* The :mod:`itertools` module has a new function, :func:`~itertools.accumulate`
modeled on APL's *scan* and on Numpy's *accumulate* function:
modeled on APL's *scan* operator and on Numpy's *accumulate* function:
>>> list(accumulate(8, 2, 50))
[8, 10, 60]
@ -443,6 +462,10 @@ New, Improved, and Deprecated Modules
* The :mod:`abc` module now supports :func:`~abc.abstractclassmethod` and
:func:`~abc.abstractstaticmethod`.
These tools make it possible to define an :term:`Abstract Base Class` that
requires a particular :func:`classmethod` or :func:`staticmethod` to be
implemented.
(Patch submitted by Daniel Urban; :issue:`5867`.)
* The previously deprecated :func:`contextlib.nested` function has been removed