🌐 Mailman 3 August 2004 - Python-list - python.org

Bandwidth Calculator
by Maboroshi Aug. 31, 2004

Aug. 31, 2004

Hi I was wondering if there was anyway of determing the use of Bandwidth on a remote computer in python through the ip address Any Ideas Cheers Maboroshi

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PyPI
by p.kosina Aug. 31, 2004

Aug. 31, 2004

I tried to make a registration on www.python.org/PyPI, but no email confirmation received. Is it working? Is anyone responsible for that here? Thanks a lot Pavel

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Re: 'for l in sys.stdin' at interactive prompt (WAS: Re: sys.stdin.readline())
by Hallvard B Furuseth Aug. 31, 2004

Aug. 31, 2004

Steven Bethard wrote: >Hallvard B Furuseth <h.b.furuseth <at> usit.uio.no> writes: >> Or in newer Pythons, simply `for sL in sys.stdin: print sL'. > > This doesn't work for me in the interactive shell: > (...) Whoops - you just found a mysterious bug in a program I'm writing. Thanks:-) > Note that I don't get output until I hit ^Z (this is, obviously, a Windows > box). I tried starting Python with the -u option too, and I still get this > result. Is there any way to make 'for l in sys.stdin' work the way you > suggest it does at an interactive prompt? Can't see any in the manual, now that I've looked more closely. Info node "(python-lib)File Objects" says file.next() uses a read- ahead buffer. It doesn't say one can disable that. -- Hallvard

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Re: Are decorators really that different from metaclasses...
by Hallvard B Furuseth Aug. 31, 2004

Aug. 31, 2004

Paul Morrow wrote: >Paul Morrow wrote: >> But why speculate. Let's see if this is really going to be unclear in >> practice. Ask someone who has never seen Python before which are the >> local variables in the following def. >> >> def circumference(diameter): >> """Calculate the diameter of a circle.""" >> __author__ = 'Paul Morrow' >> __version__ = '0.1' >> pi = 3.14 >> return pi * diameter > > And while you're at it, ask them which lines get executed at function > definition time, and which get executed when the function is called. Of course that's obvious with your simple example, since it clearly doesn't even use those variables and you can even tell from the function name what the function ought to do. What is not obvious is how it works. OK, I asked my neighbor: She suggested some kind of default variables. She noticed that the variables were not being used; if the function had been longer she would apparently have needed to read through the entire function to be sure. I think my guess would have been something like C's static variables. The assigment would be initialization, but of a variable in the same namespace. Which seems similar to her guess, even though we thought of it very differently. -- Hallvard

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Re: Are decorators really that different from metaclasses...
by Hallvard B Furuseth Aug. 31, 2004

Aug. 31, 2004

Paul Morrow wrote: >Jeff Epler wrote: >> In your proposed model, what does the following code do? >> def f(): >> __var__ = 3 >> return __var__ >> f.__var__ += 1 >> print f() >> > > Only assignments to __xxx__ variables at the very start of a function > def would have this special semantics. So your return statement would > be referencing a name (__var__) that doesn't exist in the function's > local variable namespace. No, that would silently return a surprising result if __var__ existed in the global namespace. Better make it a syntax error or something. -- Hallvard

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What GCC version had <stdint.h> defined?
by Scott David Daniels Aug. 31, 2004

Aug. 31, 2004

I am trying to figure out how to get 2.4a2 to build a python extension. GCC 2.2.95 does not have a stdint.h, but 3.2.3 does. These two are the only gcc versions I have on my box. Does anyone know which version of GCC introduced stdint.h (and thereby uintptr_t and intptr_t)? I'd like to get the conditionals right. -Scott David Daniels Scott.Daniels(a)Acm.Org

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Re: Beeping the console
by wojciech_mula＠poczta.null.onet.pl.invalid Aug. 31, 2004

Aug. 31, 2004

Jeffrey Barish wrote: > What is the easiest way to beep the console from a Python program (i.e., > to do the same thing as echo -e \a)? import os import sys os.write(sys.stdout.fileno(), '\007') w.

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xmlrpclib
by Graeme Matthew Aug. 31, 2004

Aug. 31, 2004

G'day everyone Just wanted to know if anyone knows if xmlrpclib is scalable i.e can handle many / asynchronous calls. Any help or advice is appreciated Cheers Graeme

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Re: Are decorators really that different from metaclasses...
by bokr＠oz.net Aug. 31, 2004

Aug. 31, 2004

On Tue, 31 Aug 2004 09:25:43 -0400, Paul Morrow <pm_mon(a)yahoo.com> wrote: >Paul Morrow wrote: >> >> But why speculate. Let's see if this is really going to be unclear in >> practice. Ask someone who has never seen Python before which are the >> local variables in the following def. >> >> def circumference(diameter): >> """Calculate the diameter of a circle.""" >> __author__ = 'Paul Morrow' >> __version__ = '0.1' >> pi = 3.14 >> return pi * diameter >> >> > >And while you're at it, ask them which lines get executed at function >definition time, and which get executed when the function is called. > IMO you will have better luck promoting your functionality if you make your proposed magic syntactically distinct using something other than underscores, which are just name characters in any legal name that matches [a-zA-Z_][a-zA-Z0-9_]* I think your magic becomes more interesting if we separate the two issues of referring to attributes of the current object and doing it at def-time as opposed to normal execution time (i.e., call-time for function body code), and get some orthogonal general primitives going ;-) To make things simple, let's say '$' means the current object, and let's say that we use '..' in various ways to indicate execution or evaluation at def-time. E.g., prefixed to an assignment '=' it would mean do the binding (and evaluation of the whole right hand side) at def-time. Thus your example becomes def circumference(diameter): """Calculate the diameter of a circle.""" $.author ..= 'Paul Morrow' $.version ..= '0.1' pi = 3.14 return pi * diameter But notice that the assignment of pi is a wasteful repeated action for every call. If instead if we wrote (additionally illustrating constant folding effect): pi ..= 3.14 # or __import__('math').pi for better accuracy ;-) mask7 ..= 2**7-1 # net binding as if mask7=127 the effect would be a def-time pre-binding of pi and mask7, visible locally as if def circumference(diameter, pi=3.14, mask7=2**7-1): # etc but without using the default arg hack. Of course, a default local arg name binding is refreshed to the original rhs at every call, so even if you set pi=0.0 it will appear as 3.14 next time. Unlike if you used $.pi ..= 3.14 and then set $.pi=0.0 -- that would be preset once and rebindings would persist. $.xxx would also provide good opportunity for optimizing access, and the $ attribute name space would be a handy substitute for a mutable closure object named something other than '$'. BTW, another interesting thing would be if the function class were modified so that it would recognize descriptors when attributes of its instances. This would make assignments of properties sticky unless they had a self-deleting method. E.g., def foo(): $.prop ..= property(lambda self: 'hi from %s.prop'%self.__name__) would mean foo.prop would return 'hi from foo.prop' and foo.prop = 123 would raise an exception. Or the function class could be made subclassable. BTW, an expression should also be able to have a def-time-evaluated term, without the rest being def-time, e.g., def area(r): return ..(__import__('math').pi)*r*r Note also what you could do with a mutable when you don't need the default arg hack: def pow10(x): cache ..={} try: return cache[x] except KeyError: return cache.setdefault(x, 10**x) In classes, if there is a classvar ..= something, the resulting code for the class definition should theoretically not have the assignment as byte codes when the class body executes, but the binding should be visible as-if. I don't know if there's an efficient way to do that. Seems like it would have to be pre-bound in the class dict (that gets passed to a metaclass if there is one), but I guess a fresh copy would be needed. So that would wind up way more expensive than just a plain class-def-time assignment. Hm, probably easiest just not to allow it. Inside methods, of course, ..= would be fine. Method def-times are when the class body executes (unless they are later added, in which case the ..= applies wherever the function/method was defined and its def executed. Too many ideas in one post? Ok, enough lunch fun. Regards, Bengt Richter

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has_method
by Gandalf Aug. 31, 2004

Aug. 31, 2004

Hi All! Does anyone knows how to tell if an object has a method with a given name? How can I access that method? For attributes, it is easy: class A(object): a = 12 b = 'Python' a = A() a.__dict__.has_key('a') # True a.__dict__.has_key('b') # True a.__dict__.has_key('c') # False But it won't work for methods. Thanks in advance. Laci 2.0

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