195 lines
4.5 KiB
Plaintext
195 lines
4.5 KiB
Plaintext
PEP: 3139
|
||
Title: Cleaning out sys and the "interpreter" module
|
||
Version: $Revision$
|
||
Last-Modified: $Date$
|
||
Author: Benjamin Peterson <benjamin@python.org>
|
||
Status: Rejected
|
||
Type: Standards Track
|
||
Content-Type: text/x-rst
|
||
Created: 04-Apr-2008
|
||
Python-Version: 3.0
|
||
|
||
|
||
Rejection Notice
|
||
================
|
||
|
||
Guido's -0.5 put an end to this PEP. See
|
||
https://mail.python.org/pipermail/python-3000/2008-April/012977.html.
|
||
|
||
|
||
Abstract
|
||
========
|
||
|
||
This PEP proposes a new low-level module for CPython-specific interpreter
|
||
functions in order to clean out the sys module and separate general Python
|
||
functionality from implementation details.
|
||
|
||
|
||
Rationale
|
||
=========
|
||
|
||
The sys module currently contains functions and data that can be put into two
|
||
major groups:
|
||
|
||
1. Data and functions that are available in all Python implementations and deal
|
||
with the general running of a Python virtual machine.
|
||
|
||
- argv
|
||
- byteorder
|
||
- path, path_hooks, meta_path, path_importer_cache, and modules
|
||
- copyright, hexversion, version, and version_info
|
||
- displayhook, __displayhook__
|
||
- excepthook, __excepthook__, exc_info, and exc_clear
|
||
- exec_prefix and prefix
|
||
- executable
|
||
- exit
|
||
- flags, py3kwarning, dont_write_bytecode, and warn_options
|
||
- getfilesystemencoding
|
||
- get/setprofile
|
||
- get/settrace, call_tracing
|
||
- getwindowsversion
|
||
- maxint and maxunicode
|
||
- platform
|
||
- ps1 and ps2
|
||
- stdin, stderr, stdout, __stdin__, __stderr__, __stdout__
|
||
- tracebacklimit
|
||
|
||
|
||
2. Data and functions that affect the CPython interpreter.
|
||
|
||
- get/setrecursionlimit
|
||
- get/setcheckinterval
|
||
- _getframe and _current_frame
|
||
- getrefcount
|
||
- get/setdlopenflags
|
||
- settscdumps
|
||
- api_version
|
||
- winver
|
||
- dllhandle
|
||
- float_info
|
||
- _compact_freelists
|
||
- _clear_type_cache
|
||
- subversion
|
||
- builtin_module_names
|
||
- callstats
|
||
- intern
|
||
|
||
The second collections of items has been steadily increasing over the years
|
||
causing clutter in sys. Guido has even said he doesn't recognize some of things
|
||
in it [#bug-1522]_!
|
||
|
||
Moving these items off to another module would send a clear message to
|
||
other Python implementations about what functions need and need not be
|
||
implemented.
|
||
|
||
It has also been proposed that the contents of types module be distributed
|
||
across the standard library [#types-removal]_; the interpreter module would
|
||
provide an excellent resting place for internal types like frames and code
|
||
objects.
|
||
|
||
Specification
|
||
=============
|
||
|
||
A new builtin module named "interpreter" (see `Naming`_) will be added.
|
||
|
||
The second list of items above will be split into the stdlib as follows:
|
||
|
||
The interpreter module
|
||
- get/setrecursionlimit
|
||
- get/setcheckinterval
|
||
- _getframe and _current_frame
|
||
- get/setdlopenflags
|
||
- settscdumps
|
||
- api_version
|
||
- winver
|
||
- dllhandle
|
||
- float_info
|
||
- _clear_type_cache
|
||
- subversion
|
||
- builtin_module_names
|
||
- callstats
|
||
- intern
|
||
|
||
The gc module:
|
||
- getrefcount
|
||
- _compact_freelists
|
||
|
||
|
||
Transition Plan
|
||
===============
|
||
|
||
Once implemented in 3.x, the interpreter module will be back-ported to 2.6.
|
||
Py3k warnings will be added to the sys functions it replaces.
|
||
|
||
|
||
Open Issues
|
||
===========
|
||
|
||
|
||
What should move?
|
||
-----------------
|
||
|
||
|
||
dont_write_bytecode
|
||
^^^^^^^^^^^^^^^^^^^^
|
||
|
||
Some believe that the writing of bytecode is an implementation detail and should
|
||
be moved [#bytecode-issue]_. The counterargument is that all current, complete
|
||
Python implementations do write some sort of bytecode, so it is valuable to be
|
||
able to disable it. Also, if it is moved, some wish to put it in the imp
|
||
module.
|
||
|
||
|
||
Move to some to imp?
|
||
--------------------
|
||
|
||
It was noted that dont_write_bytecode or maybe builtin_module_names might fit
|
||
nicely in the imp module.
|
||
|
||
|
||
Naming
|
||
------
|
||
|
||
The author proposes the name "interpreter" for the new module. "pyvm" has also
|
||
been suggested [#pyvm-name]_. The name "cpython" was well liked
|
||
[#cpython-name]_.
|
||
|
||
|
||
References
|
||
==========
|
||
|
||
.. [#bug-1522]
|
||
|
||
http://bugs.python.org/issue1522
|
||
|
||
.. [#types-removal]
|
||
|
||
https://mail.python.org/pipermail/stdlib-sig/2008-April/000172.html
|
||
|
||
.. [#bytecode-issue]
|
||
|
||
https://mail.python.org/pipermail/stdlib-sig/2008-April/000217.html
|
||
|
||
.. [#pyvm-name]
|
||
|
||
https://mail.python.org/pipermail/python-3000/2007-November/011351.html
|
||
|
||
.. [#cpython-name]
|
||
|
||
https://mail.python.org/pipermail/stdlib-sig/2008-April/000223.html
|
||
|
||
Copyright
|
||
=========
|
||
|
||
This document has been placed in the public domain.
|
||
|
||
|
||
|
||
Local Variables:
|
||
mode: indented-text
|
||
indent-tabs-mode: nil
|
||
sentence-end-double-space: t
|
||
fill-column: 70
|
||
coding: utf-8
|
||
End:
|