🌐 Mailman 3 November 2007 - Python-list - python.org

Re: error ...1 value to unpack
by matthias Nov. 2, 2007

Nov. 2, 2007

On Nov 2, 2:32 pm, "Chris Mellon" <arka...(a)gmail.com> wrote: > On Nov 2, 2007 3:04 PM, Beema shafreen <beema.shafr...(a)gmail.com> wrote: > > > > > hi everybody, > > i have a file: > > > A_16_P21360207#304 > > A_14_P136880#783 > > A_16_P21360209#795 > > A_16_P21360210#173 > > A_16_P03641959#1177 > > A_16_P03641960#1944 > > A_16_P03641962#999 > > A_16_P41563648#-31 > > A_16_P03641963#3391 > > A_16_P41563649#3626 > > A_16_P03641964#180 > > A_16_P41563655#1216 > > A_16_P03641965#1170 > > A_16_P03641966#194 > > A_16_P21360229#290 > > A_16_P03641967#425 > > A_16_P21360231#1091 > > A_16_P03641968#1167 > > A_16_P03641969#421 > > A_16_P03641970#63 > > A_16_P21360234#290 > > A_16_P21360235#289 > > A_16_P03641971#398 > > A_16_P21360237#418 > > A_16_P03641972#122 > > A_16_P21360239#16 > > A_16_P03641973#2187 > > A_16_P41563669#2881 > > A_16_P03641974#1101fh = open('complete_span','r') > > data = fh.readline().split('#') > > old_probe = data[0].strip() > > old_value = data[1].strip() > > #print old_probe, old_value > > count = 1 > > while fh: > > current_probe, current_value = fh.readline().strip().split('#')[0:2] > > probe =current_probe.strip() > > value = current_value.strip() > > if old_value > value: > > res_value='%s\t%s'%(old_value, old_probe) > > print res_value > > if count == 244000: > > break > > old_probe,old_value =probe, value > > fh.close() > > and i face this error:Traceback (most recent call last): > > File "count_values.py", line 8, in <module> > > current_probe, current_value = fh.readline().strip().split('#')[0:2] > > ValueError: need more than 1 value to unpack > > > why do i get this what is the solution for this.... > > regards > > shafreen > > One of your lines doesn't have a # in it, so split is returning a one > element list. No, that's not the problem. The problem is that your algo is incorrect. fh.readline() returns a null string at EOF. Thus, the split() functions fails. Personally, I would rewrite the loop completely. However this will fix your code : fh = open('complete_span','r') data = fh.readline().split('#') old_probe = data[0].strip() old_value = data[1].strip() print old_probe, old_value count = 1 line = "" while line: line = fh.readline().strip() if line : current_probe, current_value = line.split('#')[0:2] probe =current_probe.strip() value = current_value.strip() print "probe: [%s], value [%s]" % (probe, value) if old_value > value: res_value='%s\t%s'%(old_value, old_probe) print res_value if count == 244000: break old_probe,old_value =probe, value fh.close()

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Bizarre additional calling overhead.
by Chris Mellon Nov. 2, 2007

Nov. 2, 2007

>>> def test_func(): ... pass ... >>> import new >>> test_func2 = new.function(test_func.func_code, {}, "test_func2") >>> test_func2 <function test_func2 at 0x01B8C2F0> >>> test_func <function test_func at 0x01B8C270> >>> import timeit >>> tf = timeit.Timer("test_func()", "from __main__ import test_func") >>> tf.repeat() [0.2183461704377247, 0.18068215314489791, 0.17978585841498085] >>> tf2 = timeit.Timer("test_func2()", "from __main__ import test_func2") >>> tf2.repeat() [0.40015390239890891, 0.35893452879396648, 0.36034628133737456] >>> Why almost twice the calling overhead for a dynamic function?

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error ...1 value to unpack
by Beema shafreen Nov. 2, 2007

Nov. 2, 2007

hi everybody, i have a file: A_16_P21360207#304 A_14_P136880#783 A_16_P21360209#795 A_16_P21360210#173 A_16_P03641959#1177 A_16_P03641960#1944 A_16_P03641962#999 A_16_P41563648#-31 A_16_P03641963#3391 A_16_P41563649#3626 A_16_P03641964#180 A_16_P41563655#1216 A_16_P03641965#1170 A_16_P03641966#194 A_16_P21360229#290 A_16_P03641967#425 A_16_P21360231#1091 A_16_P03641968#1167 A_16_P03641969#421 A_16_P03641970#63 A_16_P21360234#290 A_16_P21360235#289 A_16_P03641971#398 A_16_P21360237#418 A_16_P03641972#122 A_16_P21360239#16 A_16_P03641973#2187 A_16_P41563669#2881 A_16_P03641974#1101fh = open('complete_span','r') data = fh.readline().split('#') old_probe = data[0].strip() old_value = data[1].strip() #print old_probe, old_value count = 1 while fh: current_probe, current_value = fh.readline().strip().split('#')[0:2] probe =current_probe.strip() value = current_value.strip() if old_value > value: res_value='%s\t%s'%(old_value, old_probe) print res_value if count == 244000: break old_probe,old_value =probe, value fh.close() and i face this error:Traceback (most recent call last): File "count_values.py", line 8, in <module> current_probe, current_value = fh.readline().strip().split('#')[0:2] ValueError: need more than 1 value to unpack why do i get this what is the solution for this.... regards shafreen A_16_P03641975#451 My script:

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Re: Assertion for python scripts
by matthias Nov. 2, 2007

Nov. 2, 2007

On Nov 2, 1:29 pm, "Bart." <uz...(a)o2.pl> wrote: > Friday 02 of November 2007 20:53:12 matthias napisa (a): > > > > > On Nov 2, 12:12 pm, "Matt McCredie" <mccre...(a)gmail.com> wrote: > > > On 11/2/07, matthias <matthiasblankenh...(a)yahoo.com> wrote: > > > > Howdy ! > > > > > I started using the assert() stmt and found it quite useful :-) I > > > > have only one problem: I don't > > > > know how to turn them off again. > > > > > I know that "-O" turns off assertions in general. However, how do I > > > > pass thus parameter to > > > > python to an executable script ? > > > > > I have tried the following: > > > > > 1. > > > > !#/usr/bin/env python -O > > > > > -> Fails with this msg: /usr/bin/env: python -O: No such file or > > > > directory > > > > > Also, putting it in quotes won't do it. > > > > > 2. > > > > Passing the "-O" to the runnable script won't work either. > > > > > Here is my question: How do I maintain debug / release builds that > > > > allow me to switch > > > > debug stmts, like assert, on / off ? > > > > > Thanx, > > > > Matthias > > > > Use: > > > python -O -mcompileall path > > > > That command will compile all of the files in the given path and > > > produce .pyo files. If the .pyo file is present and up-to-date it will > > > be used instead of the .py file. > > > > Alternatively you could do this: > > > > python -O -mpy_compile somefile.py > > > > which can be used to compile one file at a time. > > > > Many Python programs and modules include a compile step as part of > > > their installation process. There is also a -OO option, which will > > > strip doc-strings as well. > > > > Matt > > > Thanx for your reply , Matt ! > > > However, I think I am missing something. > > > Here is my example prog, assert.py, with the executable bit set: > > > #!/usr/bin/env python > > > assert 1 > 1, "ASSERTTION !" > > > Running this: > > > # python ./assert.py > > Traceback (most recent call last): > > File "assert.py", line 3, in ? > > assert 1 > 1, "ASSERTTION !" > > AssertionError: ASSERTTION ! > > > leads to the expected result. > > > Now I do this as you've recommended: > > > # python -O -mpy_compile assert.py > > > This indeed creates a file with the name assert.pyo. That must be the > > optimized one. > > > Now I try this: > > > # ./assert.py > > Traceback (most recent call last): > > File "./assert.py", line 3, in ? > > assert 1 > 1, "ASSERTTION !" > > AssertionError: ASSERTTION ! > > > Ok, so it still uses the unoptimized version. > > > Now I try this: > > > # chmod 755 assert.pyo > > # ./assert.pyo > > bash: ./assert.pyo: cannot execute binary file > > > Here is my problem: I want to have an optimized executable version of > > assert.py. > > > I am assuming that I am thinking in an unconventional way wrt Python. > > If so, then > > how do you start your optimized python scripts ? > > > Thanx, > > Matthias > > check this: > > python ./assert.pyo Yes, I know that this works. Thanx. However, that's not what I was going for. Essentially, I am targeting a build system that allows me to build debug / release versions of my Python code. I know how to build the Python code, but how do I package it so that I can simply dump it on the test system with either build type and the same calling interface ? Thanx, Matthias

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3 number and dot..
by Abandoned Nov. 2, 2007

Nov. 2, 2007

Hi.. I want to do this: for examle: 12332321 ==> 12.332.321 How can i do?

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Re: Iterable Flattener with Depth.
by bearophileHUGS＠lycos.com Nov. 2, 2007

Nov. 2, 2007

Pradeep Jindal: > Any comments? Something with similar functionality (plus another 20 utility functions/classes or so) has probably to go into the std lib... :-) Bye, bearophile

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Re: marshal vs pickle
by Aaron Watters Nov. 2, 2007

Nov. 2, 2007

On Oct 31, 3:31 am, "Evan Klitzke" <e...(a)yelp.com> wrote: > Can anyone elaborate more on the difference between marshal and > pickle. In what conditions would using marshal be unsafe? If one can > guarantee that the marshalled objects would be created and read by the > same version of Python, is that enough? Yes, I think that's enough. I like to use marshal a lot because it's the absolutely fastest way to store and load data to/from Python. Furthermore because marshal is "stupid" the programmer has complete control. A lot of the overhead you get with the pickles which make them generally much slower than marshal come from the cleverness by which pickle will recognized shared objects and all that junk. When I serialize, I generally don't need that because I know what I'm doing. For example both gadfly SQL http://gadfly.sourceforge.net and nucular full text/fielded search http://nucular.sourceforge.net use marshal as the underlying serializer. Using cPickle would probably make serialization worse than 2x slower. This is one of the 2 or 3 key tricks which make these packages as fast as they are. -- Aaron Watters === http://www.xfeedme.com/nucular/gut.py/go?FREETEXT=halloween

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Re: (MAC) CoreGraphics module???
by David C. Ullrich Nov. 2, 2007

Nov. 2, 2007

On Thu, 01 Nov 2007 19:39:20 -0500, Robert Kern <robert.kern(a)gmail.com> wrote: >David C. Ullrich wrote: >> [why doesn't CoreGraphics work?] > >That's different than the one that is referenced. The one those articles >reference is only available in the Python that came with the system in >/System/Library/Frameworks/Python.framework, not one that you might have >installed from www.python.org into /Library/Frameworks/Python.framework. The >module was made by Apple, and they have not released the source code, so it >cannot be made to work with the www.python.org distribution. usenet is amazing - your reply appears to have been posted a half hour before my question! Thanks. So CoreGraphics is a builtin in Apple-Python, explaining why I didn't find the relevant CoreGraphics.py anywhere on the hard drive, eh? Fine. Now what? Please feel free to bear in mind that I have very little experience with the Mac and with Unix - I'm certain that if I knew what I was doing there I wouldn't need to ask the questions below, sorry. And sorry about the length of this post - there's a second issue that maybe you could explain, that I'd really love to have an explanation for before modifying things. Anyway: Since I didn't do anything special to remove it when I installed the Python-Python, the Apple-Python should still be there, yes? I'd appreciate any advice on how to get things set up the way I'd like. Below when I refer to the MacPython stuff I mean ApplicationLauncher (or however it's spelled, the Mac's at the office and I'm at home) and Idle; the stuff that gives convenient access to Python scripts in the GUI. Note that I don't have any particular reason to want to use the latest version of Python - I was actually getting along fine with 1.5 until very recently. I'd be perfectly happy to set things up so everything used the Apple-Python. (i) If I just uninstalled the Python-Python (how?) would everything (Terminal, the MacPython stuff) automagically find the Apple-Python instead? (ii) If not, what would I have to do to make things use the Apple-Python instead? (And if I have to do something to make that happen, would doing that still work if I just left the Python-Python sitting there?) OR: Is there something special I could do with CoreGraphics scripts and/or how I invoke them so that _they_ would use the Apple-Python while other scripts would just use the Python-Python as now? (A last choice would be a setup where most scripts work as they do now and I somehow make CoreGraphics work from Terminal but not in Finder...) (Hmm, a wild guess: something somewhere is an alias to Python-Python, and I just change that (how?) to an alias to Apple-Python?) I'm a little nervous about making any changes, because something very mysterious happened when I was setting things up the way they are now - since I have no idea what I did to make things work the way they are now I don't know that I could set things up the way they are now again if I had to. If you can explain the following that will be something (I've been meaning to ask about the following sometime, hasn't been important til now when I'm contemplating changing the setup): The history: I get a Mac. I discover that it includes Python, can't figure out how to execute .py files in Finder. I hear about MacPython. I install the "small" MacPython download, that's supposed to just add ApplicationLauncher(?), Idle, etc on top of the existing Python. Works fine _except_ that when I double-click a .py file in Finder it executes with the cwd equal to the root directory instead of the directory where the script is located. Trying to fix that I install the "full" MacPython, including Python itself. Doesn't help, scripts still execute in "/". A few weeks later I decide to try to fix that. The plan is to edit whatever.py, the script that's supposed to run before everything else allowing customizations (always takes me a while to find the magic name in the docs - probably you know the name I mean). The plan is to extract the directory I want from sys.argv and then chdir. And here's the mysterious part: The day I plan on modifying whatever.py I find the problem has fixed itself! When I double- click .py files they execute in the right directory. If you asked what I was smoking I wouldn't blame you. (Not that I really think that's it, but the _only_ thing I can imagine I did that could have led to the change was that perhaps I hadn't yet tried out Idle when things were executing in the wrong directory, and somehow the first time I ran Idle it fixed something for me.) Anyway. You have any idea what was going on there, and/or any idea about what to do to fix that problem if it appears again? Something somewhere changed - what, and how do I change it manually? "defaults write what.what.what what what"? Or what? I'd be much happier understanding what happened here before making any changes... Evidently you've read this far - thanks. Long posts are irritating. Of course so are posts that don't describe the problem - oh well. ************************ David C. Ullrich

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using the filter function within class return error
by david.katkowski＠ddiworld.com Nov. 2, 2007

Nov. 2, 2007

I'm trying to use the __builtin__ filter function within a class; however, I receive the following error: NameError: global name 'MajEthnic' is not defined The line of code is: EthMaj = filter(self.MajEthnic,flist) So, I'm trying to use the MajEthnic function to filter the list flist. Any ideas? Thanks!

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Re: python newbie
by Jim Hendricks Nov. 2, 2007

Nov. 2, 2007

J. Clifford Dyer wrote: >> before calling my_function, x does not exist in my program. So, my >> question is in my_function, the combination of using the global >> statement, then implicitly creating x via assignment to the result of >> the open function, is x created in the global namespace? > > Yes. > >>>> y > > Traceback (most recent call last): > File "<pyshell#8>", line 1, in <module> > y > NameError: name 'y' is not defined >>>> def f(): > global y > y = 123 >>>> f() >>>> y > 123 tks, and tks also for the example. > > Remember, the interactive interpreter is your friend. Just type 'python' at the command line and hammer away. (It's even better through a decent IDE). yes, you are correct, last time I had the advantage of a console was when I was working in Forth. Working with Java & PHP for a living makes one forget that Python has the console. > > Oh yeah, you have to actually call f before y will get defined. > > Cheers, > Cliff

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