Mailman 3 February 2004 - Python-Dev

Suggestion: URL splitter that returns host, port, request URL
by Hamish Lawson Feb. 18, 2004

Feb. 18, 2004

The HTTP clients provided by many libraries (httplib in the Standard Library, asynchttp, Twisted) do not deal with absolute URLs but instead with the three component parts of host, port, and request URL. However these are not the parts returned by either urlparse.urlsplit or urlparse.urlparse. I therefore suggest it might be useful to have in the Standard Library a function that splits an absolute URL into host, port, and request URL. So for the following URL: "http://www.python.org/cgi-bin/moinmoin/FrontPage?action=edit" the function would return ("www.python.org", 80, "/cgi-bin/moinmoin/FrontPage?action=edit") An optional parameter could specify which port to use as default. Hamish Lawson

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Enhancing `iter'
by Miki Tebeka Feb. 18, 2004

Feb. 18, 2004

Hello All, Currently `iter' 2'nd parameter is used for comparison. I'd like to have the ability to give a function that will determine weather to stop or not. iter(range(10), lambda x: x > 7) will stop at 8. (There reverse logic might be uses as well: continue as long a `sentinal' returns True.) The only problem I can see is that someone might want to use a function object as a sentinal, then `iter' won't know if to call the function or to compare. However this seems very rare and can be solved by: def f(x, y): .... iter(something, lambda x: x == f) Any thoughts/objections? Bye. -- ------------------------------------------------------------------------- Miki Tebeka <miki.tebeka(a)zoran.com> http://www.cs.bgu.ac.il/~tebeka The only difference between children and adults is the price of the toys.

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Feb. 17, 2004

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Compiling python with the free .NET SDK
by Garth Feb. 17, 2004

Feb. 17, 2004

Hi , Attached is a tool to allow you to build python using the free .NET SDK and Platform SDK (and gnu tools from msys). It will generate the makefiles from the solution file. It's as easy as. 1. Copy all files into PCBuild 2 Run "sln_read.py makemake pcbuild.sln "Debug|Win32" or "sln_read.py makemake pcbuild.sln "Release|Win32" and the make files are generated 3. run make -f pcbuild.gnu.mak and python is built The readme included expands on this. There's still quite a bit todo but the tool works and I seem to be quite busy so here it is. It could be quite easilt modified to use gcc instead of cl or some other makefile thingy Enjoy Garth

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Re: [Python-Dev] Small test
by Christos Georgiou Feb. 17, 2004

Feb. 17, 2004

SGI Irix 6.5.20, MIPSPro Compilers 7.4 -n32 (default 32-bit mode) no complaints, prints Thanks! -64 (64-bit mode) no complaints, prints Thanks! -- Christos Georgiou, Customer Support Engineer Silicon Technologies S.A. 41-45 Kifissias Ave, Maroussi 151 23 Greece Tel +30 (21) 06152600 (ext. 605) Fax +30 (21) 06198140 "Dave always exaggerated." --HAL

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RE: [Python-Dev] bool does not want to be subclassed?
by Joshua Marshall Feb. 17, 2004

Feb. 17, 2004

[Joshua Marshall] > I don't think I'm convinced; the same argument could be used for > integers (if it doesn't make sense to create a sort of boolean which > isn't in the set { true, false }, then it doesn't make sense to create > a sort of integer which isn't in the set { ..., -2, -1, 0, 1, 2, ... > }). And maybe it doesn't, but this isn't the only reason for > subclassing. Another reason for subclassing is to create items which > can act like existing objects, but which have some additional > behavior. [Martin] > And indeed, for int, it is possible to have subclasses which > have new instances whose values are in the set {..., -2, -1, > 0, 1, 2, ...}. Indeed, it is possible to have multiple > instances of int *itself* whose value is, say, 1000: > > >>> 500+500 is 500+500 > False > > The same is not true for bool: There are only two *instances* > of the type, not just two equivalence classes of equal values: > > >>> (4>5) is (3>9) > True > > So bool guarantees: a) there are only two distinct values, > and b) there are only two different objects representing > these values. It is property b) which prohibits subclassing. Ah I misread Guido's comment--he's talking about the actual objects, not what they represent. So a different question... Can it be relied upon that two expressions which both evaluate to False both return the same object? That is, is it incorrect for a Python interpreter not to do this? I find this in the Python Reference Manual: "for immutable types, operations that compute new values may actually return a reference to any existing object with the same type and value" (note the "may"). Are bool and NoneType the only types for which this is reliably the case?

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RE: [Python-Dev] bool does not want to be subclassed?
by Joshua Marshall Feb. 16, 2004

Feb. 16, 2004

> [Guido] > the mere existance of an instance of a subclass of bool would > break the invariant that True and False are the only instances of > bool! (An instance of a subclass of C is also an instance of C.) > [François] > This is a convincing argument, and enough a reason. Thanks! Now, I know why Python refuses! :-) I don't think I'm convinced; the same argument could be used for integers (if it doesn't make sense to create a sort of boolean which isn't in the set { true, false }, then it doesn't make sense to create a sort of integer which isn't in the set { ..., -2, -1, 0, 1, 2, ... }). And maybe it doesn't, but this isn't the only reason for subclassing. Another reason for subclassing is to create items which can act like existing objects, but which have some additional behavior.

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symtable module & globals
by Peter Åstrand Feb. 16, 2004

Feb. 16, 2004

I've found the symtable module, which is quite nice. Unfortunately, I cannot find any documentation, and the module don't work as I expect: If the source looks like this: foo = 1 def fie(): print foo Calling is_global() for the "foo" name returns False (using the fie functions SymbolTable). With a method, is_global() returns true, though: foo = 1 class C: def fie(self): print foo Have I misunderstood something, or is this a bug? -- /Peter Åstrand <astrand(a)lysator.liu.se>

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PyCon DC Early bird rate EXTENDED until Feb 22, 2004
by Guido van Rossum Feb. 16, 2004

Feb. 16, 2004

Due to overwhelming success, the early bird deadline for PyCon DC 2004 has been *extended* to February 22. The early bird registration fee is only $175 ($125 for students). Monday the 23rd it goes up to $250 (really). To register, visit: http://www.pycon.org/dc2004/register/ Speakers, you too!!! DC 2004 will be held March 24-26, 2004 in Washington, D.C. The keynote speaker is Mitch Kapor of the Open Source Applications Foundation (http://www.osafoundation.org/). Famous C++/Java/Python author/evangelist Bruce Eckel will give a closing keynote. There will be a four-day development sprint before the conference. For all PyCon information: http://www.pycon.org/ See you all there! --Guido van Rossum (home page: http://www.python.org/~guido/)

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PyDict_Size() error return
by Jeremy Hylton Feb. 15, 2004

Feb. 15, 2004

PyDict_Size() sets an exception and returns 0 if it is passed NULL or a non-dict. Is this a bug? It seems like it should return -1, otherwise you'd have to distinguish between an empty dict and an error by calling PyErr_Occurred(). Jeremy

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