🌐 Mailman 3 March 2010 - Python-list - python.org

Re: Re Interest check in some delicious syntactic sugar for "except:pass"
by Michael Rudolf March 3, 2010

March 3, 2010

Am 03.03.2010 12:47, schrieb Oren Elrad: > """ code involving somefile """ > try: > ........os.remove(somefile) > except: > .......pass # The bloody search indexer has got the file and I > can't delete it. Nothing to be done. You don't know that what you stated in your comment is true. All you know is that there was an exception. To find the reason, you have to inspect the exception. You escpecially do NOT know whether the file is removed or not. OK, os.remove() might be a CPython builtin (not sure ATM), but in general all sort of crazy things can happen here, like ImportError raised by code in the lib or so. And of course: a bare except: also catches ^C or SystemExit. That is almost certainly *not* what you want, right? To your first question about a "silenced" keyword: you could emulate this with context managers I guess. Something like (untested, just a quick mockup how it could look): class silenced: def __init__(self, *silenced): self.exceptions=tuple(silenced) #just to be explicit def __enter__(self): return self #dito1 def __exit__(self, type, value, traceback): for ex in self.exceptions: if isinstance(value, ex): return True #supresses exception So: with silenced(os.Error): os.remove(somefile) Would translate to: try: os.remove(somefile) except os.Error: pass One nice thing about this approach would be that you can alias a set of exceptions with this: idontcareabouttheseerrors=silenced(TypeError, ValueError, PEBCAKError, SyntaxError, EndOfWorldError, 1D10T_Error) with idontcareabouttheseerrors: do_stuff() Regards, Michael

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pyao makes the right sound but why?
by '2+ March 3, 2010

March 3, 2010

with my soy.py tofu = soy.Bean() x = tofu.pattern(44100 * 3) creates x which is an array('h') and len(x) = 44100 * 6 this x is a stereo groove pattern that lasts 3 sec if samplerate is set to 44100 and since wave.py could save it to a_file.wav i was wondering if dev = ao.AudioDevice('alsa') dev.play(x) could launch me a semi realtime dj kinda sys luckily .. it does seem to be making the right sound but why? the default of the samplerate and that 16bit happened to match with my thing x? o but if i do dev.play(x, len(x)) it only plays the half of the pattern and dev.play(x, 2 * len(x)) does the right thing and the 2nd 4th 6th .. play gives me ALSA underrun, at least 0ms 3rd, 5th, 7th does it fine /usr/share/doc/python-pyao doesn't teach me the answer does somebody know more about pyao? -- SaRiGaMa's Oil Vending Orchestra is podcasting: http://sarigama.namaste.jp/podcast/rss.xml

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Few early questions on Class
by joy99 March 3, 2010

March 3, 2010

Dear Group, I was practising some early example of class if you can kindly let me know where I was going wrong. I am pasting directly from IDLE. There may be slight indentation problem. I am using Python 2.6.4 on Windows XP Service Pack 3. The Code and the output: >>> class Student: def _init_(self,name): self.name=name self.attendance=0 self.marks=[] number_of_marks=len(self.marks) print number_of_marks >>> b=Student("Bobby") Traceback (most recent call last): File "<pyshell#9>", line 1, in <module> b=Student("Bobby") TypeError: this constructor takes no arguments >>> Class Shape: SyntaxError: invalid syntax >>> class Shape: def _init_(self,x,y): self.x=x self.y=y description="This Shape is not been described Yet" author="Nobody has Claimed it Yet" def area(self): return self*x+self*y def perimeter(self): return 2*self.x+2*self*y >>> rectangle=Shape(100,45) Traceback (most recent call last): File "<pyshell#22>", line 1, in <module> rectangle=Shape(100,45) TypeError: this constructor takes no arguments >>> rectangle=Shape() >>> print rectangle.area() Traceback (most recent call last): File "<pyshell#24>", line 1, in <module> print rectangle.area() AttributeError: Shape instance has no attribute 'area' >>> Best Regards, Subhabrata.

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save CRL to a file (M2Crypto.X509.CRL object)
by pranav March 3, 2010

March 3, 2010

I do not see an option to save M2Crypto.X509.CRL object to a file. Am I overlooking something? Thanks

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Tu mailing llega ahora a todos lados
by yyfgv＠yahoo.com.ar March 3, 2010

March 3, 2010

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RICHARD MOORE wants to stay in touch on LinkedIn
by RICHARD MOORE March 3, 2010

March 3, 2010

LinkedIn ------------ I'd like to add you to my professional network on LinkedIn. - RICHARD MOORE Confirm that you know RICHARD MOORE https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/ ------ (c) 2010, LinkedIn Corporation

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RICHARD MOORE wants to stay in touch on LinkedIn
by RICHARD MOORE March 3, 2010

March 3, 2010

LinkedIn ------------ I'd like to add you to my professional network on LinkedIn. - RICHARD MOORE Confirm that you know RICHARD MOORE https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/ ------ (c) 2010, LinkedIn Corporation

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monkey patching with @classmethod
by gentlestone March 3, 2010

March 3, 2010

Hi, is there some well-known problems with class method monkey patching? I've got this error message: unbound method get_pocet_neocislovanych() must be called with Pozemok instance as first argument (got Subjekt instance instead) The method is declared as: @classmethod @monkeypatch(Dokument) def get_pocet_neocislovanych(cls, subjekt): return cls.objects.filter(subjekt = subjekt, cislo__isnull = True).count() # or pass, this line is not important and the monkey patch decorator is declared as: def monkeypatch(cls): def decorator(func): setattr(cls, func.__name__, func) return func return decorator If I move the method to class declaration (whitout monkey patching), everything is ok, but only if I've restarted the server.

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Eric4 vs Python3.1
by Zhu Sha Zang March 3, 2010

March 3, 2010

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Someone using Eric4 to program with Python3/3.1? What can i do, because he insist to use only Python2.6.4. Att -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuOZO4ACgkQ35zeJy7JhCjdFACfZrjVa+8O9fu/7FEPr6mVeaEg Rm0AmgM+XtuxFH1zUnfkaphF+MgPy3pf =MVeJ -----END PGP SIGNATURE-----

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Working group for Python CPAN-equivalence?
by Olof Bjarnason March 3, 2010

March 3, 2010

Hi everybody! The "Where is CPAN for Python?" question keeps popping up, with answers ranging from "There is no CPAN for Python" and "We already have CPAN for Python" (confusing). I'm wondering - is there any work being done identifying .. (1) what is so good with CPAN? (2) how can it be brought to the Python world? Is there a working group/initiative for this? Web page? Discussion group? /Olof

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