mirror of https://github.com/python/cpython
Add introductory paragraphs
Remove comment about MacOS changes; I'm not going to have time to figure
out what they are
Move PEP 273 section into numeric order
This commit is contained in:
Andrew M. Kuchling
parent
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@ -11,14 +11,26 @@
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\maketitle
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\tableofcontents
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% To do:
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% MacOS framework-related changes (section of its own, probably)
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%\section{Introduction \label{intro}}
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This article explains the new features in Python 2.3. The tentative
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This article explains the new features in Python 2.3. The
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release date of Python 2.3 is currently scheduled for August 2003.
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The main themes for Python 2.3 are polishing some of the features
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added in 2.2, adding various small but useful enhancements to the core
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language, and expanding the standard library. The new object model
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introduced in the previous version has benefited from 18 months of
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bugfixes and from optimization efforts that have improved the
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performance of new-style classes. A few new built-in functions have
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been added such as \function{sum()} and \function{enumerate()}. The
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\keyword{in} operator can now be used for substring searches (e.g.
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\code{"ab" in "abc"} returns \constant{True}).
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Some of the many new library features include Boolean, set, heap, and
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date/time data types, the ability to import modules from ZIP-format
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archives, metadata support for the long-awaited Python catalog, an
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updated version of IDLE, and modules for logging messages, wrapping
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text, parsing CSV files, processing command-line options, using BerkeleyDB
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databases... the list of new and enhanced modules is lengthy.
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This article doesn't attempt to provide a complete specification of
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the new features, but instead provides a convenient overview. For
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full details, you should refer to the documentation for Python 2.3,
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@ -302,6 +314,57 @@ Hisao and Martin von~L\"owis.}
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\end{seealso}
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%======================================================================
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\section{PEP 273: Importing Modules from Zip Archives}
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The new \module{zipimport} module adds support for importing
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modules from a ZIP-format archive. You don't need to import the
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module explicitly; it will be automatically imported if a ZIP
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archive's filename is added to \code{sys.path}. For example:
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\begin{verbatim}
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amk@nyman:~/src/python$ unzip -l /tmp/example.zip
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Archive: /tmp/example.zip
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Length Date Time Name
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-------- ---- ---- ----
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8467 11-26-02 22:30 jwzthreading.py
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-------- -------
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8467 1 file
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amk@nyman:~/src/python$ ./python
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Python 2.3 (#1, Aug 1 2003, 19:54:32)
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>>> import sys
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>>> sys.path.insert(0, '/tmp/example.zip') # Add .zip file to front of path
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>>> import jwzthreading
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>>> jwzthreading.__file__
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'/tmp/example.zip/jwzthreading.py'
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>>>
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\end{verbatim}
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An entry in \code{sys.path} can now be the filename of a ZIP archive.
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The ZIP archive can contain any kind of files, but only files named
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\file{*.py}, \file{*.pyc}, or \file{*.pyo} can be imported. If an
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archive only contains \file{*.py} files, Python will not attempt to
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modify the archive by adding the corresponding \file{*.pyc} file, meaning
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that if a ZIP archive doesn't contain \file{*.pyc} files, importing may be
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rather slow.
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A path within the archive can also be specified to only import from a
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subdirectory; for example, the path \file{/tmp/example.zip/lib/}
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would only import from the \file{lib/} subdirectory within the
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archive.
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\begin{seealso}
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\seepep{273}{Import Modules from Zip Archives}{Written by James C. Ahlstrom,
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who also provided an implementation.
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Python 2.3 follows the specification in \pep{273},
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but uses an implementation written by Just van~Rossum
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that uses the import hooks described in \pep{302}.
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See section~\ref{section-pep302} for a description of the new import hooks.
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}
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\end{seealso}
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%======================================================================
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\section{PEP 277: Unicode file name support for Windows NT}
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@ -653,57 +716,6 @@ Walter D\"orwald.}
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\end{seealso}
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%======================================================================
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\section{PEP 273: Importing Modules from Zip Archives}
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The new \module{zipimport} module adds support for importing
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modules from a ZIP-format archive. You don't need to import the
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module explicitly; it will be automatically imported if a ZIP
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archive's filename is added to \code{sys.path}. For example:
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\begin{verbatim}
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amk@nyman:~/src/python$ unzip -l /tmp/example.zip
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Archive: /tmp/example.zip
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Length Date Time Name
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-------- ---- ---- ----
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8467 11-26-02 22:30 jwzthreading.py
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-------- -------
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8467 1 file
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amk@nyman:~/src/python$ ./python
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Python 2.3 (#1, Aug 1 2003, 19:54:32)
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>>> import sys
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>>> sys.path.insert(0, '/tmp/example.zip') # Add .zip file to front of path
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>>> import jwzthreading
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>>> jwzthreading.__file__
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'/tmp/example.zip/jwzthreading.py'
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>>>
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\end{verbatim}
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An entry in \code{sys.path} can now be the filename of a ZIP archive.
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The ZIP archive can contain any kind of files, but only files named
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\file{*.py}, \file{*.pyc}, or \file{*.pyo} can be imported. If an
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archive only contains \file{*.py} files, Python will not attempt to
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modify the archive by adding the corresponding \file{*.pyc} file, meaning
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that if a ZIP archive doesn't contain \file{*.pyc} files, importing may be
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rather slow.
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A path within the archive can also be specified to only import from a
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subdirectory; for example, the path \file{/tmp/example.zip/lib/}
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would only import from the \file{lib/} subdirectory within the
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archive.
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\begin{seealso}
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\seepep{273}{Import Modules from Zip Archives}{Written by James C. Ahlstrom,
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who also provided an implementation.
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Python 2.3 follows the specification in \pep{273},
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but uses an implementation written by Just van~Rossum
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that uses the import hooks described in \pep{302}.
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See section~\ref{section-pep302} for a description of the new import hooks.
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}
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\end{seealso}
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%======================================================================
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\section{PEP 301: Package Index and Metadata for
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Distutils\label{section-pep301}}
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