Python-Dev May 2003

python-dev@python.org

108 participants
141 discussions

PEP 1, PEP Purpose and Guidelines
by barry＠zope.com 18 May '21

18 May '21

It has been a while since I posted a copy of PEP 1 to the mailing lists and newsgroups. I've recently done some updating of a few sections, so in the interest of gaining wider community participation in the Python development process, I'm posting the latest revision of PEP 1 here. A version of the PEP is always available on-line at http://www.python.org/peps/pep-0001.html Enjoy, -Barry -------------------- snip snip -------------------- PEP: 1 Title: PEP Purpose and Guidelines Version: $Revision: 1.36 $ Last-Modified: $Date: 2002/07/29 18:34:59 $ Author: Barry A. Warsaw, Jeremy Hylton Status: Active Type: Informational Created: 13-Jun-2000 Post-History: 21-Mar-2001, 29-Jul-2002 What is a PEP? PEP stands for Python Enhancement Proposal. A PEP is a design document providing information to the Python community, or describing a new feature for Python. The PEP should provide a concise technical specification of the feature and a rationale for the feature. We intend PEPs to be the primary mechanisms for proposing new features, for collecting community input on an issue, and for documenting the design decisions that have gone into Python. The PEP author is responsible for building consensus within the community and documenting dissenting opinions. Because the PEPs are maintained as plain text files under CVS control, their revision history is the historical record of the feature proposal[1]. Kinds of PEPs There are two kinds of PEPs. A standards track PEP describes a new feature or implementation for Python. An informational PEP describes a Python design issue, or provides general guidelines or information to the Python community, but does not propose a new feature. Informational PEPs do not necessarily represent a Python community consensus or recommendation, so users and implementors are free to ignore informational PEPs or follow their advice. PEP Work Flow The PEP editor, Barry Warsaw <peps(a)python.org>, assigns numbers for each PEP and changes its status. The PEP process begins with a new idea for Python. It is highly recommended that a single PEP contain a single key proposal or new idea. The more focussed the PEP, the more successfully it tends to be. The PEP editor reserves the right to reject PEP proposals if they appear too unfocussed or too broad. If in doubt, split your PEP into several well-focussed ones. Each PEP must have a champion -- someone who writes the PEP using the style and format described below, shepherds the discussions in the appropriate forums, and attempts to build community consensus around the idea. The PEP champion (a.k.a. Author) should first attempt to ascertain whether the idea is PEP-able. Small enhancements or patches often don't need a PEP and can be injected into the Python development work flow with a patch submission to the SourceForge patch manager[2] or feature request tracker[3]. The PEP champion then emails the PEP editor <peps(a)python.org> with a proposed title and a rough, but fleshed out, draft of the PEP. This draft must be written in PEP style as described below. If the PEP editor approves, he will assign the PEP a number, label it as standards track or informational, give it status 'draft', and create and check-in the initial draft of the PEP. The PEP editor will not unreasonably deny a PEP. Reasons for denying PEP status include duplication of effort, being technically unsound, not providing proper motivation or addressing backwards compatibility, or not in keeping with the Python philosophy. The BDFL (Benevolent Dictator for Life, Guido van Rossum) can be consulted during the approval phase, and is the final arbitrator of the draft's PEP-ability. If a pre-PEP is rejected, the author may elect to take the pre-PEP to the comp.lang.python newsgroup (a.k.a. python-list(a)python.org mailing list) to help flesh it out, gain feedback and consensus from the community at large, and improve the PEP for re-submission. The author of the PEP is then responsible for posting the PEP to the community forums, and marshaling community support for it. As updates are necessary, the PEP author can check in new versions if they have CVS commit permissions, or can email new PEP versions to the PEP editor for committing. Standards track PEPs consists of two parts, a design document and a reference implementation. The PEP should be reviewed and accepted before a reference implementation is begun, unless a reference implementation will aid people in studying the PEP. Standards Track PEPs must include an implementation - in the form of code, patch, or URL to same - before it can be considered Final. PEP authors are responsible for collecting community feedback on a PEP before submitting it for review. A PEP that has not been discussed on python-list(a)python.org and/or python-dev(a)python.org will not be accepted. However, wherever possible, long open-ended discussions on public mailing lists should be avoided. Strategies to keep the discussions efficient include, setting up a separate SIG mailing list for the topic, having the PEP author accept private comments in the early design phases, etc. PEP authors should use their discretion here. Once the authors have completed a PEP, they must inform the PEP editor that it is ready for review. PEPs are reviewed by the BDFL and his chosen consultants, who may accept or reject a PEP or send it back to the author(s) for revision. Once a PEP has been accepted, the reference implementation must be completed. When the reference implementation is complete and accepted by the BDFL, the status will be changed to `Final.' A PEP can also be assigned status `Deferred.' The PEP author or editor can assign the PEP this status when no progress is being made on the PEP. Once a PEP is deferred, the PEP editor can re-assign it to draft status. A PEP can also be `Rejected'. Perhaps after all is said and done it was not a good idea. It is still important to have a record of this fact. PEPs can also be replaced by a different PEP, rendering the original obsolete. This is intended for Informational PEPs, where version 2 of an API can replace version 1. PEP work flow is as follows: Draft -> Accepted -> Final -> Replaced ^ +----> Rejected v Deferred Some informational PEPs may also have a status of `Active' if they are never meant to be completed. E.g. PEP 1. What belongs in a successful PEP? Each PEP should have the following parts: 1. Preamble -- RFC822 style headers containing meta-data about the PEP, including the PEP number, a short descriptive title (limited to a maximum of 44 characters), the names, and optionally the contact info for each author, etc. 2. Abstract -- a short (~200 word) description of the technical issue being addressed. 3. Copyright/public domain -- Each PEP must either be explicitly labelled as placed in the public domain (see this PEP as an example) or licensed under the Open Publication License[4]. 4. Specification -- The technical specification should describe the syntax and semantics of any new language feature. The specification should be detailed enough to allow competing, interoperable implementations for any of the current Python platforms (CPython, JPython, Python .NET). 5. Motivation -- The motivation is critical for PEPs that want to change the Python language. It should clearly explain why the existing language specification is inadequate to address the problem that the PEP solves. PEP submissions without sufficient motivation may be rejected outright. 6. Rationale -- The rationale fleshes out the specification by describing what motivated the design and why particular design decisions were made. It should describe alternate designs that were considered and related work, e.g. how the feature is supported in other languages. The rationale should provide evidence of consensus within the community and discuss important objections or concerns raised during discussion. 7. Backwards Compatibility -- All PEPs that introduce backwards incompatibilities must include a section describing these incompatibilities and their severity. The PEP must explain how the author proposes to deal with these incompatibilities. PEP submissions without a sufficient backwards compatibility treatise may be rejected outright. 8. Reference Implementation -- The reference implementation must be completed before any PEP is given status 'Final,' but it need not be completed before the PEP is accepted. It is better to finish the specification and rationale first and reach consensus on it before writing code. The final implementation must include test code and documentation appropriate for either the Python language reference or the standard library reference. PEP Template PEPs are written in plain ASCII text, and should adhere to a rigid style. There is a Python script that parses this style and converts the plain text PEP to HTML for viewing on the web[5]. PEP 9 contains a boilerplate[7] template you can use to get started writing your PEP. Each PEP must begin with an RFC822 style header preamble. The headers must appear in the following order. Headers marked with `*' are optional and are described below. All other headers are required. PEP: <pep number> Title: <pep title> Version: <cvs version string> Last-Modified: <cvs date string> Author: <list of authors' real names and optionally, email addrs> * Discussions-To: <email address> Status: <Draft | Active | Accepted | Deferred | Final | Replaced> Type: <Informational | Standards Track> * Requires: <pep numbers> Created: <date created on, in dd-mmm-yyyy format> * Python-Version: <version number> Post-History: <dates of postings to python-list and python-dev> * Replaces: <pep number> * Replaced-By: <pep number> The Author: header lists the names and optionally, the email addresses of all the authors/owners of the PEP. The format of the author entry should be address(a)dom.ain (Random J. User) if the email address is included, and just Random J. User if the address is not given. If there are multiple authors, each should be on a separate line following RFC 822 continuation line conventions. Note that personal email addresses in PEPs will be obscured as a defense against spam harvesters. Standards track PEPs must have a Python-Version: header which indicates the version of Python that the feature will be released with. Informational PEPs do not need a Python-Version: header. While a PEP is in private discussions (usually during the initial Draft phase), a Discussions-To: header will indicate the mailing list or URL where the PEP is being discussed. No Discussions-To: header is necessary if the PEP is being discussed privately with the author, or on the python-list or python-dev email mailing lists. Note that email addresses in the Discussions-To: header will not be obscured. Created: records the date that the PEP was assigned a number, while Post-History: is used to record the dates of when new versions of the PEP are posted to python-list and/or python-dev. Both headers should be in dd-mmm-yyyy format, e.g. 14-Aug-2001. PEPs may have a Requires: header, indicating the PEP numbers that this PEP depends on. PEPs may also have a Replaced-By: header indicating that a PEP has been rendered obsolete by a later document; the value is the number of the PEP that replaces the current document. The newer PEP must have a Replaces: header containing the number of the PEP that it rendered obsolete. PEP Formatting Requirements PEP headings must begin in column zero and the initial letter of each word must be capitalized as in book titles. Acronyms should be in all capitals. The body of each section must be indented 4 spaces. Code samples inside body sections should be indented a further 4 spaces, and other indentation can be used as required to make the text readable. You must use two blank lines between the last line of a section's body and the next section heading. You must adhere to the Emacs convention of adding two spaces at the end of every sentence. You should fill your paragraphs to column 70, but under no circumstances should your lines extend past column 79. If your code samples spill over column 79, you should rewrite them. Tab characters must never appear in the document at all. A PEP should include the standard Emacs stanza included by example at the bottom of this PEP. A PEP must contain a Copyright section, and it is strongly recommended to put the PEP in the public domain. When referencing an external web page in the body of a PEP, you should include the title of the page in the text, with a footnote reference to the URL. Do not include the URL in the body text of the PEP. E.g. Refer to the Python Language web site [1] for more details. ... [1] http://www.python.org When referring to another PEP, include the PEP number in the body text, such as "PEP 1". The title may optionally appear. Add a footnote reference that includes the PEP's title and author. It may optionally include the explicit URL on a separate line, but only in the References section. Note that the pep2html.py script will calculate URLs automatically, e.g.: ... Refer to PEP 1 [7] for more information about PEP style ... References [7] PEP 1, PEP Purpose and Guidelines, Warsaw, Hylton http://www.python.org/peps/pep-0001.html If you decide to provide an explicit URL for a PEP, please use this as the URL template: http://www.python.org/peps/pep-xxxx.html PEP numbers in URLs must be padded with zeros from the left, so as to be exactly 4 characters wide, however PEP numbers in text are never padded. Reporting PEP Bugs, or Submitting PEP Updates How you report a bug, or submit a PEP update depends on several factors, such as the maturity of the PEP, the preferences of the PEP author, and the nature of your comments. For the early draft stages of the PEP, it's probably best to send your comments and changes directly to the PEP author. For more mature, or finished PEPs you may want to submit corrections to the SourceForge bug manager[6] or better yet, the SourceForge patch manager[2] so that your changes don't get lost. If the PEP author is a SF developer, assign the bug/patch to him, otherwise assign it to the PEP editor. When in doubt about where to send your changes, please check first with the PEP author and/or PEP editor. PEP authors who are also SF committers, can update the PEPs themselves by using "cvs commit" to commit their changes. Remember to also push the formatted PEP text out to the web by doing the following: % python pep2html.py -i NUM where NUM is the number of the PEP you want to push out. See % python pep2html.py --help for details. Transferring PEP Ownership It occasionally becomes necessary to transfer ownership of PEPs to a new champion. In general, we'd like to retain the original author as a co-author of the transferred PEP, but that's really up to the original author. A good reason to transfer ownership is because the original author no longer has the time or interest in updating it or following through with the PEP process, or has fallen off the face of the 'net (i.e. is unreachable or not responding to email). A bad reason to transfer ownership is because you don't agree with the direction of the PEP. We try to build consensus around a PEP, but if that's not possible, you can always submit a competing PEP. If you are interested assuming ownership of a PEP, send a message asking to take over, addressed to both the original author and the PEP editor <peps(a)python.org>. If the original author doesn't respond to email in a timely manner, the PEP editor will make a unilateral decision (it's not like such decisions can be reversed. :). References and Footnotes [1] This historical record is available by the normal CVS commands for retrieving older revisions. For those without direct access to the CVS tree, you can browse the current and past PEP revisions via the SourceForge web site at http://cvs.sourceforge.net/cgi-bin/cvsweb.cgi/python/nondist/peps/?cvsroot=… [2] http://sourceforge.net/tracker/?group_id=5470&atid=305470 [3] http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse [4] http://www.opencontent.org/openpub/ [5] The script referred to here is pep2html.py, which lives in the same directory in the CVS tree as the PEPs themselves. Try "pep2html.py --help" for details. The URL for viewing PEPs on the web is http://www.python.org/peps/ [6] http://sourceforge.net/tracker/?group_id=5470&atid=305470 [7] PEP 9, Sample PEP Template http://www.python.org/peps/pep-0009.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 End:

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RE: [Python-Dev] Those import related syntax errors again...
by Samuele Pedroni 23 Feb '05

23 Feb '05

Hi. [Mark Hammond] > The point isn't about my suffering as such. The point is more that > python-dev owns a tiny amount of the code out there, and I don't believe we > should put Python's users through this. > > Sure - I would be happy to "upgrade" all the win32all code, no problem. I > am also happy to live in the bleeding edge and take some pain that will > cause. > > The issue is simply the user base, and giving Python a reputation of not > being able to painlessly upgrade even dot revisions. I agree with all this. [As I imagined explicit syntax did not catch up and would require lot of discussions.] [GvR] > > Another way is to use special rules > > (similar to those for class defs), e.g. having > > > > <frag> > > y=3 > > def f(): > > exec "y=2" > > def g(): > > return y > > return g() > > > > print f() > > </frag> > > > > # print 3. > > > > Is that confusing for users? maybe they will more naturally expect 2 > > as outcome (given nested scopes). > > This seems the best compromise to me. It will lead to the least > broken code, because this is the behavior that we had before nested > scopes! It is also quite easy to implement given the current > implementation, I believe. > > Maybe we could introduce a warning rather than an error for this > situation though, because even if this behavior is clearly documented, > it will still be confusing to some, so it is better if we outlaw it in > some future version. > Yes this can be easy to implement but more confusing situations can arise: <frag> y=3 def f(): y=9 exec "y=2" def g(): return y return y,g() print f() </frag> What should this print? the situation leads not to a canonical solution as class def scopes. or <frag> def f(): from foo import * def g(): return y return g() print f() </frag> [Mark Hammond] > > This probably won't be a very popular suggestion, but how about pulling > > nested scopes (I assume they are at the root of the problem) > > until this can be solved cleanly? > > Agreed. While I think nested scopes are kinda cool, I have lived without > them, and really without missing them, for years. At the moment the cure > appears worse then the symptoms in at least a few cases. If nothing else, > it compromises the elegant simplicity of Python that drew me here in the > first place! > > Assuming that people really _do_ want this feature, IMO the bar should be > raised so there are _zero_ backward compatibility issues. I don't say anything about pulling nested scopes (I don't think my opinion can change things in this respect) but I should insist that without explicit syntax IMO raising the bar has a too high impl cost (both performance and complexity) or creates confusion. [Andrew Kuchling] > >Assuming that people really _do_ want this feature, IMO the bar should be > >raised so there are _zero_ backward compatibility issues. > > Even at the cost of additional implementation complexity? At the cost > of having to learn "scopes are nested, unless you do these two things > in which case they're not"? > > Let's not waffle. If nested scopes are worth doing, they're worth > breaking code. Either leave exec and from..import illegal, or back > out nested scopes, or think of some better solution, but let's not > introduce complicated backward compatibility hacks. IMO breaking code would be ok if we issue warnings today and implement nested scopes issuing errors tomorrow. But this is simply a statement about principles and raised impression. IMO import * in an inner scope should end up being an error, not sure about 'exec's. We will need a final BDFL statement. regards, Samuele Pedroni.

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2.3b1 release
by Guido van Rossum 08 Aug '03

08 Aug '03

I'd like to do a 2.3b1 release someday. Maybe at the end of next week, that would be Friday April 25. If anyone has something that needs to be done before this release go out, please let me know! Assigning a SF bug or patch to me and setting the priority to 7 is a good way to get my attention. --Guido van Rossum (home page: http://www.python.org/~guido/)

14 51

doctest extensions
by Jim Fulton 28 Jun '03

28 Jun '03

I've written some doctest extensions to: - Generate a unitest (pyunit) test suite from a module with doctest tests. Each doc string containing one or more doctest tests becomes a test case. If a test fails, an error message is included in the unittest output that has the module file name and the approximate line number of the docstring containing the failed test formatted in a way understood by emacs error parsing. This is important. ;) - Debug doctest tests. Normally, doctest tests can't be debugged with pdb because, while they are running, doctest has taken over standard output. This tool extracts the tests in a doc string into a separate script and runs pdb on it. - Extract a doctest doc string into a script file. I think that these would be good additions to doctest and propose to add them, The current source can be found here: http://cvs.zope.org/Zope3/src/zope/testing/doctestunit.py?rev=HEAD&content-… I ended up using a slightly different (and simpler) strategy for finding docstrings than doctest uses. This might be an issue. Jim -- Jim Fulton mailto:jim@zope.com Python Powered! CTO (703) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org

2 1

Change to ossaudiodev setparameters() method
by Greg Ward 03 Jun '03

03 Jun '03

Currently, oss_audio_device objects have a setparameters() method with a rather silly interface: oss.setparameters(sample_rate, sample_size, num_channels, format [, emulate]) This is silly because 1) 'sample_size' is implicit in 'format', and 2) the implementation doesn't actually *use* sample_size for anything -- it just checks that you have passed in the correct sample size, ie. if you specify an 8-bit format, you must pass sample_size=8. (This is code inherited from linuxaudiodev that I never got around to cleaning up.) In addition to being silly, this is not the documented interface. The docs don't mention the 'sample_size' argument at all. Presumably the doc writer realized the silliness and was going to pester me to remove 'sample_size', but never got around to it. (Lot of that going around.) So, even though we're in a beta cycle, am I allowed to change the code so it's 1) sensible and 2) consistent with the documentation? Greg -- Greg Ward <gward(a)python.net> http://www.gerg.ca/ Sure, I'm paranoid... but am I paranoid ENOUGH?

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Algoritmic Complexity Attack on Python
by Scott A Crosby 02 Jun '03

02 Jun '03

Hello. We have analyzed this software to determine its vulnerability to a new class of DoS attacks that related to a recent paper. ''Denial of Service via Algorithmic Complexity Attacks.'' This paper discusses a new class of denial of service attacks that work by exploiting the difference between average case performance and worst-case performance. In an adversarial environment, the data structures used by an application may be forced to experience their worst case performance. For instance, hash tables are usually thought of as being constant time operations, but with large numbers of collisions will degrade to a linked list and may lead to a 100-10,000 times performance degradation. Because of the widespread use of hash tables, the potential for attack is extremely widespread. Fortunately, in many cases, other limits on the system limit the impact of these attacks. To be attackable, an application must have a deterministic or predictable hash function and accept untrusted input. In general, for the attack to be signifigant, the applications must be willing and able to accept hundreds to tens of thousands of 'attack inputs'. Because of that requirement, it is difficult to judge the impact of these attack without knowing the source code extremely well, and knowing all ways in which a program is used. As part of this project, I have examined python 2.3b1, and the hash function 'string_hash' is deterministic. Thus any script that may hash untrusted input may vulnerable to our attack. Furthermore, the structure of the hash functions allows our fast collision generation algorithm to work. This means that any script written in python that hashes a large number of keys from an untrusted source is potentially subject to a severe performance degradation. Depending on the application or script, this could be a critical DoS. The solution for these attacks on hash tables is to make the hash function unpredictable via a technique known as universal hashing. Universal hashing is a keyed hash function where, based on the key, one of a large set hash functions is chosen. When benchmarking, we observe that for short or medium length inputs, it is comparable in performance to simple predictable hash functions such as the ones in Python or Perl. Our paper has graphs and charts of our benchmarked performance. I highly advise using a universal hashing library, either our own or someone elses. As is historically seen, it is very easy to make silly mistakes when attempting to implement your own 'secure' algorithm. The abstract, paper, and a library implementing universal hashing is available at http://www.cs.rice.edu/~scrosby/hash/. Scott

10 31

Introduction
by Terence Way 02 Jun '03

02 Jun '03

I've been lurking for a bit, and now seems like a good time to introduce myself. * I build messaging systems for banks, earlier I was CTO of a dot-com. * I started programming on the TRS-80 and the RCA COSMAC VIP, later on the Apple ][. * I am a Java refugee (well, I might still code in Java for pay). * I'm into formal methods. Translation: I like *talking* about formal methods, but I never use them myself :-) I read somewhere that the best way to build big Python callouses was to write a PEP. Here goes: http://www.wayforward.net/pycontract/pep-0999.html Programming by Contract for Python... pre-conditions, post-conditions, invariants, with all the Eiffel goodness like weakening pre-conditions and strengthening invariants and post-conditions on inheritance, and access to old values. All from docstrings, like doctest. I'm also into handling insane numbers of incoming connections on cheap boxes: compare Jef Poskanzer's thttpd to Apache. 10000 simultaneous HTTP connections on a $400 computer just gets me giggling. Stackless Python intrigues me greatly for the same reason. I guess that's it for now... Cheers!

10 14

more-precise instructions for "Python.h first"?
by David Abrahams 02 Jun '03

02 Jun '03

Boost.Python is now trying hard to accomodate the "Python.h before system headers rule". Unfortunately, we still need a wrapper around Python.h, at least for some versions of Python, so that we can work around some issues like: // // Python's LongObject.h helpfully #defines ULONGLONG_MAX for us // even when it's not defined by the system which confuses Boost's // config // To cope with that correctly, we need to see <limits.h> (a system header) before longobject.h. Currently, we're including <limits.h>, then <patchlevel.h>, well, and then the wrapper gets a little complicated adjusting for various compilers. Anyway, the point is that I'd like to have the rule changed to "You have to include Python.h or xxxx.h before any system header" where xxxx.h is one of the other existing headers #included in Python.h that is responsible for setting up whatever macros cause this inclusion-order requirement in the first place (preferably not LongObject.h!) That way I might be able to get those configuration issues sorted out without violating the #inclusion order rule. What I have now seems to work, but I'd rather do the right thing (TM). -- Dave Abrahams Boost Consulting www.boost-consulting.com

4 9

RELEASED Python 2.2.3 (final)
by Barry Warsaw 30 May '03

30 May '03

I'm happy to announce the release of Python 2.2.3 (final). This is a bug fix release for the stable Python 2.2 code line. It contains more than 40 bug fixes and memory leak patches since Python 2.2.2, and all Python 2.2 users are encouraged to upgrade. The new release is available here: http://www.python.org/2.2.3/ For full details, see the release notes at http://www.python.org/2.2.3/NEWS.txt There are a small number of minor incompatibilities with Python 2.2.2; for details see: http://www.python.org/2.2.3/bugs.html Perhaps the most important is that the Bastion.py and rexec.py modules have been disabled, since we do not deem them to be safe. As usual, a Windows installer and a Unix/Linux source tarball are made available. The documentation has been updated as well, and is available both on-line and in many different formats. At the moment, no Mac version or Linux RPMs are available, although I expect them to appear soon. On behalf of Guido, I'd like to thank everyone who contributed to this release, and who continue to ensure Python's success. Enjoy, -Barry

1 0

KeyboardInterrupt on Windows
by Guido van Rossum 30 May '03

30 May '03

I received this problem report (Kurt is the IDLEFORK developer). Does anybody know what could be the matter here? What changed recently??? --Guido van Rossum (home page: http://www.python.org/~guido/) ------- Forwarded Message Date: Fri, 30 May 2003 15:50:15 -0400 From: kbk(a)shore.net (Kurt B. Kaiser) To: Guido van Rossum <guido(a)python.org> Subject: KeyboardInterrupt I find that while 1: pass doesn't respond to a KeyboardInterrupt on Python2.3b1 on either WinXP or W2K. Is this generally known? I couldn't find any mention of it. while 1: a = 0 is fine on 2.3b1, and both work on Python2.2. - -- KBK ------- End of Forwarded Message

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Python-Dev May 2003