🌐 Mailman 3 January 2009 - Python-list - python.org

patch
by Pavel Kosina Jan. 3, 2009

Jan. 3, 2009

Týká se to Pythonu okrajově, přesto to dávám sem. Myslím, že by se mohlo hodit i ostatním, kdo chtějí zkoušet pod Windows nové věci z development verze: Jak opatchovat (pythonýrský) soubor pod Windows? Co jsem udělal: 1/ stáhl jsem http://gnuwin32.sourceforge.net/packages/patch.htm 2/ nainstaloval pod amin, přidal cestu do ..bin .. do PATH 3/ stáhl http://bugs.python.org/file12561/conv.diff a uložil do Lib/idlelib 4/ cmd: patch < conf.diff hází chybu: C:\prg\Python30\Lib\idlelib>patch < conv.diff patching file IOBinding.py Assertion failed: hunk, file ../patch-2.5.9-src/patch.c, line 354 This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Patchuje někdo tady pod Windows? Díky -- geon Pavel Kosina

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list iteration if statement
by alex goretoy Jan. 3, 2009

Jan. 3, 2009

Hello All, I'm doing this in my code [[v.append(j) for j in i] for i in self.value] if works and all, but I need to add a if statement in the mix. Can't seem to remember the syntax to do so and everything I've tried seems to fail. How do I add a check to see if j is not int("0") then append to v list? Thank you in advance. -A -- А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я

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Re: list iteration if statement
by Mensanator Jan. 3, 2009

Jan. 3, 2009

On Jan 2, 8:43�pm, "alex goretoy" <aleksandr.gore...(a)gmail.com> wrote: > rather, how do I suppress the output of the list with all None in it? > > >>> l=[['3'], ['0', '4'], ['0', '1'], ['0']] > >>> v=[] > >>> [[v.append(j)for j in i if j != "0"] for i in l] > > [[None], [None], [None], []] > > >>> v > ['39', '32', '1'] > Assign it to something. >>> ignore_me = [[v.append(j)for j in i if j != "0"] for i in l] >>> v ['3', '4', '1']

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Re: Noob question: Is all this typecasting normal?
by Steven D'Aprano Jan. 3, 2009

Jan. 3, 2009

On Fri, 02 Jan 2009 21:02:19 -0500, Steve Holden wrote: > Ben Finney wrote: >> vk <vminch(a)gmail.com> writes: >> >>>> If there were, I would expect it to conform with PEP 8 (get those >>>> ugly camelCase names outta there :-) >>> haha, please forgive me. >>> I'll try and think of some more creative names. >> >> They don't need to be creative; they merely need to conform with the >> naming scheme as laid out in the PEP. >> > They don't *need* to do that. They do if you want it accepted into the standard library, which was the hope. Not *my* hope, you understand, but that of the person who suggested it :) -- Steven

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Re: list iteration if statement
by Steven D'Aprano Jan. 3, 2009

Jan. 3, 2009

On Sat, 03 Jan 2009 01:52:04 +0000, alex goretoy wrote: > Hello All, > > I'm doing this in my code > > [[v.append(j) for j in i] for i in self.value] > > if works and all, Replacing "self.value" with a list of lists of ints: >>> list_of_lists = [[1, 2, 3], [2, 4, 6]] >>> v = [] >>> output = [[v.append(j) for j in sublist] for sublist in list_of_lists] >>> v [1, 2, 3, 2, 4, 6] >>> output [[None, None, None], [None, None, None]] So you create two lists, one is a copy of self.value which has been flattened, and the other is a nested list of nothing but None. What a waste of effort if your input is large. Why not just do the obvious for loop? v = [] for L in list_of_lists: for item in L: v.append(item) > but I need to add a if statement in the mix. Using a for loop, it should be obvious: v = [] for L in list_of_lists: for item in L: if item != 0: v.append(item) > Can't > seem to remember the syntax to do so and everything I've tried seems to > fail. If you *insist* on doing it the wrong way, [[v.append(j) for j in i if j != 0] for i in self.value] > How do I add a check to see if j is not int("0") then append to v > list? Thank you in advance. -A Is there some significance of you saying int("0") instead of 0? -- Steven.

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Pass by reference
by iu2 Jan. 3, 2009

Jan. 3, 2009

Hi, Is it possible somehow to change a varible by passing it to a function? I tried this: def change_var(dict0, varname, val): dict0[varname] = val def test(): a = 100 change_var(locals(), 'a', 3) print a But test() didn't work, the value a remains 100. I have several variables initialized to None. I need to convert each one of them an object only if it is None. something like: if not var1: var1 = MyObject() I want this to be a function, that is: def create_obj(var): if not var: var = MyObj() # set properties of var Now, I know I can achieve this by functional programming, def create_obj(var): if not var: x = MyObj() # set properties of x return x return var and then var = creaet_obj(var) Is there another way? Thanks

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None
by 4329402926＠txt.att.net Jan. 3, 2009

Jan. 3, 2009

-- ================================================================== This mobile text message is brought to you by AT&T

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Re: Why not Ruby?
by r Jan. 3, 2009

Jan. 3, 2009

On Jan 2, 6:54 pm, Gerry Reno <gr...(a)verizon.net> wrote: > There's been almost 50 responses to this rubbish post. Could you please > all stop! Donde es Xah Lee?

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Re: type conversion
by r Jan. 3, 2009

Jan. 3, 2009

On Jan 2, 1:46 pm, Robert Kern <robert.k...(a)gmail.com> wrote: > r wrote: > > On Jan 1, 4:40 pm, Robert Kern <robert.k...(a)gmail.com> wrote: > >> Hamish McKenzie wrote: > >>> sometimes I want to be able to initialize an instance with a variety of different data types. > >>> as an obvious example I might want to initialize a 4x4 matrix with either 16 floats, a list/tuple or 16 floats, another matrix or a quaternion. > >>> is there any other way to do it other than putting case statements in the __init__ method of the class, or having a Matrix.FromQuaternion( quat )? > >> I recommend keeping the __init__() as dumb as possible. Ideally, it should just > >> assign to attributes. I would add a from<foo>() classmethod for each <foo> that > >> I wanted to support. If I really wanted an all-singing, all-dancing > >> initialization method, I would add another classmethod that would just dispatch > >> to the appropriate type-specific classmethod. I prefer classmethods to plain > >> functions because I can subclass. > > >> -- > >> Robert Kern > > >> "I have come to believe that the whole world is an enigma, a harmless enigma > >> that is made terrible by our own mad attempt to interpret it as though it had > >> an underlying truth." > >> -- Umberto Eco > > > Why are you busting into this thread? > > Are you talking to me, or Hamish, who (presumably unintentionally) responded to > a message instead of making a new thread? > > If you want to suggest that one should have more care about starting new > threads, that's fine, but please do not jump to the conclusion that there is > malintent. And don't chastise people for not being as rude as you. > > -- > Robert Kern > > "I have come to believe that the whole world is an enigma, a harmless enigma > that is made terrible by our own mad attempt to interpret it as though it had > an underlying truth." > -- Umberto Eco I am not so much chastising Hamish as i am Steven, Steven knows better than this BS, and has preached to so many people about off topic post that my ears are bleeding from his incessant rambling about it. Now, he goes and does what he complains about soooo much. I'm just calling him on it thats all. I can't speak for the other responders because i know of none of them.

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Re: Reverse order of bit in repeating seqence of byte string
by bearophileHUGS＠lycos.com Jan. 2, 2009

Jan. 2, 2009

imageguy: > I receive the byte string with the following sequence 'bgrbgrbgrbgr' > and I would like to convert this to 'rbgrbgrbgrbg' > FWIW, the string is created using ctypes.create_string_buffer function MRAB: > >>> a.tostring() > '210543876' That's not the required 'rbgrbgrbgrbg', but you are close to a correct solution: >>> from array import array >>> s = 'bgrbgrbgrbgr' >>> a = array("B", s) # uppercase B >>> a[0::3], a[1::3], a[2::3] = a[2::3], a[0::3], a[1::3] >>> a.tostring() 'rbgrbgrbgrbg' Bye, bearophile

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