PyTables 2.2rc2 ready to test
=== Announcing PyTables 2.2rc2 === PyTables is a library for managing hierarchical datasets and designed to efficiently cope with extremely large amounts of data with support for full 64-bit file addressing. PyTables runs on top of the HDF5 library and NumPy package for achieving maximum throughput and convenient use. This is the second (and probably last) release candidate for PyTables 2.2, so please test it as much as you can before I declare the beast stable. The main new features in 2.2 series are: * A new compressor called Blosc, designed to read/write data to/from memory at speeds that can be faster than a system `memcpy()` call. With it, many internal PyTables operations that are currently bounded by CPU or I/O bandwith are speed-up. Some benchmarks: http://blosc.pytables.org/trac/wiki/SyntheticBenchmarks * A new `tables.Expr` module (based on Numexpr) that allows to do persistent, on-disk computations on many algebraic operations. For a brief look on its performance, see: http://pytables.org/moin/ComputingKernel * Support for HDF5 hard links, soft links and automatic external links (kind of mounting external filesystems). A new tutorial about its usage has been added to the 'Tutorials' chapter of User's Manual. * Suport for 'fancy' indexing (i.e., à la NumPy) in all the data containers in PyTables. Backported from the implementation in the h5py project. Thanks to Andrew Collette for his fine work on this! As always, a large amount of bugs have been addressed and squashed too. In case you want to know more in detail what has changed in this version, have a look at: http://www.pytables.org/moin/ReleaseNotes/Release_2.2rc2 You can download a source package with generated PDF and HTML docs, as well as binaries for Windows, from: http://www.pytables.org/download/preliminary For an on-line version of the manual, visit: http://www.pytables.org/docs/manual-2.2rc2 Resources = About PyTables: http://www.pytables.org About the HDF5 library: http://hdfgroup.org/HDF5/ About NumPy: http://numpy.scipy.org/ Acknowledgments === Thanks to many users who provided feature improvements, patches, bug reports, support and suggestions. See the ``THANKS`` file in the distribution package for a (incomplete) list of contributors. Most specially, a lot of kudos go to the HDF5 and NumPy (and numarray!) makers. Without them, PyTables simply would not exist. Share your experience = Let us know of any bugs, suggestions, gripes, kudos, etc. you may have. **Enjoy data!** -- The PyTables Team -- Francesc Alted -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: gui doubt
On 6/16/10 10:40 PM, madhuri vio wrote: if i want to create a button which performs the transcription of dna to rna using tkinter in a gui... can u give me the method... You can not possibly be serious. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: basic doubt
On 06/16/2010 11:06 PM, madhuri vio wrote: def h(self,event): handle = open(myco.fasta,r) for seq_record in SeqIO.parse(handle, fasta): messenger_rna = coding_myco.fasta.transcribe() han1 = open(mycorna.fasta,wU) han1.close() return self.messenger_rna the error is... File /usr/lib/python2.6/lib-tk/Tkinter.py, line 1413, in __call__ return self.func(*args) TypeError: h() takes exactly 2 arguments (0 given) ia m unable to debug...i am stuck You will have to provide more code than this. The traceback error you are getting is coming from Tk's event loop when it tries to execute your callback. Your callback is defined as having two parameters, but whatever is calling it from within Tk is expecting it to have no parameters. Without seeing a complete (but minimal!) code example that folks can run on their own computers and replicate your problem, there's no way for any of us to help you debug your code. Given the nature of your queries, I assume your are most likely in academia, doing bioinformatics research. You would be wise to seek out help from a computer science student or professor. In fact you're likely to receive more help by doing that than from this mailing list, at least at this stage. In your next post, please do at least the following things: 1. Make the e-mail subject clear, precise, and descriptive. basic doubt or gui doubt is *simply not acceptable*. Instead you might say, How can I run a function when I click a button in Tk? or What does this traceback mean? 2. Post enough code so that someone can cut and paste it and run it through python to duplicate your error. If you don't, I'm afraid that 95% of the list members are going to silently delete your e-mails, which will no doubt cause you much frustration. Many have already blocked your e-mail address. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.4.4 Tkinter GUI Example for Modeless Dialog with Menu, Edit, List, Buttons, File Save etc.
On 06/16/2010 04:05 PM, My Python wrote: I would like to see some substantial example of an App written for a Modeless Dialog (fixed size, non resizable window) (If you have used WIndows MFC or Visual Basic you all know how elegant it is) What is elegant about a fixed-size, non-re-sizable window? (Actually what is elegant about MFC... shudder). Definitely sounds like something out of Windows. How do you plan to deal with varying screen resolutions and dot pitches if your dialogs are all fixed-size? What happens when you run your app on a high res screen where the default font size is twice as large as what you planned for? Tk? PyQt? PyGTK? wxPython? -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.4.4 Tkinter GUI Example for Modeless Dialog with Menu, Edit, List, Buttons, File Save etc.
On 06/17/2010 12:50 AM, Michael Torrie wrote: On 06/16/2010 04:05 PM, My Python wrote: I would like to see some substantial example of an App written for a Modeless Dialog (fixed size, non resizable window) Tk? PyQt? PyGTK? wxPython? Nevermind that question. You stated that in your subject line. Perhaps the best known, large program is IDLE. But I don't think it implements any dialog boxes as you desire, though. -- http://mail.python.org/mailman/listinfo/python-list
Re: Overriding __setattr__ of a module - possible?
En Wed, 16 Jun 2010 19:56:39 -0300, Ian Kelly ian.g.ke...@gmail.com escribió: On Wed, Jun 16, 2010 at 3:38 PM, John Nagle na...@animats.com wrote: That just leaves things in a state where even sys and import are undefined. Say what? It works fine for me. import proxy_mod proxy_mod.f() 1 proxy_mod.a = 2 setting a=2 proxy_mod.f() 2 proxy_mod.sys module 'sys' (built-in) It *mostly* works, but not always. Try this function: def g(x): global a print 'global a - ', x a = x py import fake # ModuleProxy stuff py fake.f() 1 py fake.a = 3 setting a=3 py fake.f() 3 py fake.g(8) global a - 8 py fake.f() 8 py fake.a 8 Note the fake.g(8) call: __setattr__ wasn't called. If the OP wants to trace assignments to global variables, this becomes a problem. A function defined in a module holds a reference to the module's __dict__ in its func_globals attribute. Getting and setting global variables goes directly to this dictionary, and does not use the module object at all. Even worse, the LOAD_GLOBAL/STORE_GLOBAL opcodes (which implement getting and setting global variables) assume func_globals is a true dictionary and bypass any overriden __getitem__/__setitem__ methods (an optimization, surely). I'm afraid it will be hard to intercept global variable usage in these circumstances. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Overriding __setattr__ of a module - possible?
* Gabriel Genellina, on 17.06.2010 09:25: En Wed, 16 Jun 2010 19:56:39 -0300, Ian Kelly ian.g.ke...@gmail.com escribió: On Wed, Jun 16, 2010 at 3:38 PM, John Nagle na...@animats.com wrote: That just leaves things in a state where even sys and import are undefined. Say what? It works fine for me. import proxy_mod proxy_mod.f() 1 proxy_mod.a = 2 setting a=2 proxy_mod.f() 2 proxy_mod.sys module 'sys' (built-in) It *mostly* works, but not always. Try this function: def g(x): global a print 'global a - ', x a = x py import fake # ModuleProxy stuff py fake.f() 1 py fake.a = 3 setting a=3 py fake.f() 3 py fake.g(8) global a - 8 py fake.f() 8 py fake.a 8 Note the fake.g(8) call: __setattr__ wasn't called. If the OP wants to trace assignments to global variables, this becomes a problem. A function defined in a module holds a reference to the module's __dict__ in its func_globals attribute. Getting and setting global variables goes directly to this dictionary, and does not use the module object at all. Even worse, the LOAD_GLOBAL/STORE_GLOBAL opcodes (which implement getting and setting global variables) assume func_globals is a true dictionary and bypass any overriden __getitem__/__setitem__ methods (an optimization, surely). I'm afraid it will be hard to intercept global variable usage in these circumstances. Great exposition. But who would have thunk that Python *isn't dynamic enough*? :-) Cheers, - Alf -- blog at url: http://alfps.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: basic doubt
En Thu, 17 Jun 2010 02:06:54 -0300, madhuri vio madhuri@gmail.com escribió: def h(self,event): handle = open(myco.fasta,r) for seq_record in SeqIO.parse(handle, fasta): messenger_rna = coding_myco.fasta.transcribe() han1 = open(mycorna.fasta,wU) han1.close() return self.messenger_rna the error is... File /usr/lib/python2.6/lib-tk/Tkinter.py, line 1413, in __call__ return self.func(*args) TypeError: h() takes exactly 2 arguments (0 given) ia m unable to debug...i am stuck This is just a guess, but looks like your h function is a plain function, not a method, so it doesn't take a self parameter. Also, you are probably using it in some place where the callback doesn't receive any additional arguments (like a Button command). Try with def f(): ... If it doesn't work, show us the part where h is used. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Communicating with a program using subprocess
I have a file called increment.py as follows:
#!/usr/bin/python
n = 0
while True:
n = int(raw_input(n)) + 1
This is easy to understand, but I want to pipe it's input/output
by another python program. (I will show what I am doing on the
console to test it)
from subprocess import *
p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE)
p.communicate(5)
Traceback (most recent call last):
File increment.py, line 4, in module
n = int(raw_input(n)) + 1
EOFError: EOF when reading a line
('06', None)
p.communicate(7)
Traceback (most recent call last):
File stdin, line 1, in module
File /usr/lib/python2.6/subprocess.py, line 701, in communicate
return self._communicate(input)
File /usr/lib/python2.6/subprocess.py, line 1184, in _communicate
self.stdin.flush()
ValueError: I/O operation on closed file
The problem is that I want to use communicate multiple times
before closing the file.
How could I achieve this
--
http://mail.python.org/mailman/listinfo/python-list
Re: Overriding __setattr__ of a module - possible?
En Thu, 17 Jun 2010 04:52:48 -0300, Alf P. Steinbach al...@start.no escribió: * Gabriel Genellina, on 17.06.2010 09:25: En Wed, 16 Jun 2010 19:56:39 -0300, Ian Kelly ian.g.ke...@gmail.com escribió: On Wed, Jun 16, 2010 at 3:38 PM, John Nagle na...@animats.com wrote: That just leaves things in a state where even sys and import are undefined. Say what? It works fine for me. import proxy_mod proxy_mod.f() 1 proxy_mod.a = 2 setting a=2 proxy_mod.f() 2 proxy_mod.sys module 'sys' (built-in) It *mostly* works, but not always. Try this function: def g(x): global a print 'global a - ', x a = x py import fake # ModuleProxy stuff py fake.f() 1 py fake.a = 3 setting a=3 py fake.f() 3 py fake.g(8) global a - 8 py fake.f() 8 py fake.a 8 Note the fake.g(8) call: __setattr__ wasn't called. If the OP wants to trace assignments to global variables, this becomes a problem. A function defined in a module holds a reference to the module's __dict__ in its func_globals attribute. Getting and setting global variables goes directly to this dictionary, and does not use the module object at all. Even worse, the LOAD_GLOBAL/STORE_GLOBAL opcodes (which implement getting and setting global variables) assume func_globals is a true dictionary and bypass any overriden __getitem__/__setitem__ methods (an optimization, surely). I'm afraid it will be hard to intercept global variable usage in these circumstances. Great exposition. But who would have thunk that Python *isn't dynamic enough*? :-) Yep... There are other examples too (e.g. the print statement in 2.x bypasses sys.stdout.write; see also a recent thread Which objects are expanded by double-star ** operator?) Most of them seem to be speed optimizations, some might be considered subtle bugs. But in this case (global variable references) speed is so critical than even the dict lookup is inlined; the code in ceval.c says: /* Inline the PyDict_GetItem() calls. WARNING: this is an extreme speed hack. Do not try this at home. */ Python is dynamic but not so much as to make it crawl like a snail... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Overriding __setattr__ of a module - possible?
On Jun 17, 10:29 am, Gabriel Genellina gagsl-...@yahoo.com.ar wrote: En Thu, 17 Jun 2010 04:52:48 -0300, Alf P. Steinbach al...@start.no escribió: But who would have thunk that Python *isn't dynamic enough*? :-) Yep... There are other examples too (e.g. the print statement in 2.x bypasses sys.stdout.write; What do you mean by this? The print statement in 2.x does *not* bypass sys.stdout. It may use other methods besides write (writeln perhaps) but you can *definitely* override sys.stdout to capture the output from print statements. Michael Foord see also a recent thread Which objects are expanded by double-star ** operator?) Most of them seem to be speed optimizations, some might be considered subtle bugs. But in this case (global variable references) speed is so critical than even the dict lookup is inlined; the code in ceval.c says: /* Inline the PyDict_GetItem() calls. WARNING: this is an extreme speed hack. Do not try this at home. */ Python is dynamic but not so much as to make it crawl like a snail... -- Gabriel Genellina -- http://www.voidspace.org.uk/ -- http://mail.python.org/mailman/listinfo/python-list
List of lists surprising behaviour
Let's the following code : t=[[0]*2]*3 t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [1, 0], [1, 0]] Rather surprising, isn't it ? So I suppose all the subarrays reférence the same array : id(t[0]), id(t[1]), id(t[2]) (3077445996L, 3077445996L, 3077445996L) So what is the right way to initialize to 0 a 2D array ? Is that way correct : t=[[0 for _ in range(2)] for _ in range(3)] It seems there is no more trouble now : t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [0, 0], [0, 0]] Correct ? -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I fix this test so it runs on Windows? (it uses tzset)
Nobody wrote: On Wed, 16 Jun 2010 16:30:02 +0100, Chris Withers wrote: I'd like to make test_non_gmt_timezone at the bottom of https://... run on Windows, any suggestions? MSVCRT has _tzset(), which understands the TZ environment variable. http://msdn.microsoft.com/en-us/library/90s5c885%28VS.80%29.aspx For whatever reason, tython's time module doesn't provide the tzset() function on Windows. However, you should be able to use it via ctypes. This sounds pretty heavyweight for a unit test. I'm not even sure how I would do this ;-) Where can I find an example? ...or better yet, does anyone have any alternative solutions? Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: List of lists surprising behaviour
On 06/17/10 20:21, candide wrote: Let's the following code : t=[[0]*2]*3 t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [1, 0], [1, 0]] Rather surprising, isn't it ? So I suppose all the subarrays reférence the same array : id(t[0]), id(t[1]), id(t[2]) (3077445996L, 3077445996L, 3077445996L) Yep, you're right. They share the same subarray if you uses multiplication to build the array. So what is the right way to initialize to 0 a 2D array ? Is that way correct : t=[[0 for _ in range(2)] for _ in range(3)] Right again. That's the way to go. Although if the elements are immutable, you can create the innermost array by multiplication: t=[[0]*2 for _ in range(3)] -- http://mail.python.org/mailman/listinfo/python-list
Re: List of lists surprising behaviour
Yes you are. List comprehension makes you create list of lists without reference-sharing. You should also find a recipe about that on the python cookbook. On Thu, Jun 17, 2010 at 12:21 PM, candide cand...@free.invalid wrote: Let's the following code : t=[[0]*2]*3 t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [1, 0], [1, 0]] Rather surprising, isn't it ? So I suppose all the subarrays reférence the same array : id(t[0]), id(t[1]), id(t[2]) (3077445996L, 3077445996L, 3077445996L) So what is the right way to initialize to 0 a 2D array ? Is that way correct : t=[[0 for _ in range(2)] for _ in range(3)] It seems there is no more trouble now : t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [0, 0], [0, 0]] Correct ? -- http://mail.python.org/mailman/listinfo/python-list -- Matteo Landi http://www.matteolandi.net/ -- http://mail.python.org/mailman/listinfo/python-list
Could not import external source folder in Pydev
Env info: Python version: '2.6.5 (r265:79063, Apr 16 2010, 13:57:41) \n[GCC 4.4.3]' Eclipse version: Version: 3.5.2 Build id: M20100211-1343 PyDev version: PyDev for Eclipse 1.5.7.2010050621 org.python.pydev.feature.feature.group OS: Ubuntu 10.04 Problem: I am trying to develop a module using web2py's DAL classes. To be able to do it, I want to add web2py/gluon source folder as external source folder to my project. Even after doing that, I am not able to get the classes/packages in gluon directory in my dev env (auto-completion doesn't happen; run fails.) Can someone please let me know if there is any known issue/or if I am going wrong somewhere? Thanks in advance for your help. -- Narendran -- http://mail.python.org/mailman/listinfo/python-list
Serializing functions
Some weeks ago, here on the mailing list I read about picloud[1], a python library used for cloud-computing; I was impressed by its simplicity, here is an example: import cloud def square(x): ... return x * x cloud.call(square, 10) cloud.result() 100 So, I tried to figure out how to achieve the same result, i.e. define a local generic function and send it somewhere for remote execution, and the get the result back. So I thought about serialization (pickle): I made a few tries and it seemed to work.. but I was wrong, because I never tried to load pickled data from another session different from the one used to pickle data itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? Thanks in advance. [1] http://www.picloud.com/ -- Matteo Landi http://www.matteolandi.net -- http://mail.python.org/mailman/listinfo/python-list
Re: a +b ?
On Wed, Jun 16, 2010 at 11:34 PM, Aahz a...@pythoncraft.com wrote: In article mailman.1662.1276743037.32709.python-l...@python.org, James Mills prolo...@shortcircuit.net.au wrote: ... What in particular do you _not_ enjoy about using map/reduce (and possibly other functional features of the Python programing language) ? map() never felt particularly Pythonic, especially the way it works with None as the function combined with multiple arguments. I can't explain why I loathe reduce() -- it just doesn't fit my brain. FWIW, I don't know what reduce() does. Every time I see it I have to look it up. I think I understand map() but probably wouldn't use it (Note: I haven't actually written any code in a few years, being retired, or unemployed, or something) -- http://mail.python.org/mailman/listinfo/python-list
Re: GUIs - A Modest Proposal
On 2010-06-16, Matt m...@themattfella.xxxyyz.com wrote: On 06/05/2010 09:22 PM, ant wrote: PyQt is tied to one platform. Several posters have asked for support for or clarification of this claim of yours. Let me guess... The one platform it's tied to is Qt? -- Grant Edwards grant.b.edwardsYow! Let's all show human at CONCERN for REVERAND MOON's gmail.comlegal difficulties!! -- http://mail.python.org/mailman/listinfo/python-list
Re: List of lists surprising behaviour
candide wrote: So what is the right way to initialize to 0 a 2D array ? Is that way correct : t=[[0 for _ in range(2)] for _ in range(3)] That's overkill :) You can skip the inner loop by using a list display, eg t=[[0,0] for _ in range(3)] It seems there is no more trouble now : t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [0, 0], [0, 0]] Correct ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
Matteo Landi a écrit : Some weeks ago, here on the mailing list I read about picloud[1], a python library used for cloud-computing; I was impressed by its simplicity, here is an example: import cloud def square(x): ... return x * x cloud.call(square, 10) cloud.result() 100 So, I tried to figure out how to achieve the same result, i.e. define a local generic function and send it somewhere for remote execution, and the get the result back. So I thought about serialization (pickle): I made a few tries and it seemed to work.. but I was wrong, because I never tried to load pickled data from another session different from the one used to pickle data itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? Hint found on picloud's website: PiCloud's programming library, cloud, automatically transfers the necessary source code, byte code, execution state, and data to run your function on our cluster. -- http://mail.python.org/mailman/listinfo/python-list
Goals,watch the World Cup .. mondial 2010 Online
Goals,watch the World Cup .. mondial 2010 Online http://www.echance.info/fifa2010 http://www.echance.info/sopcast-en http://www.echance.info/sopcast-ar -- http://mail.python.org/mailman/listinfo/python-list
كيف تحصل على لاب توب جائزة
How to get a laptop gift http://echance.info/laptop.htm -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
Matteo Landi landima...@gmail.com writes: If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? Use marshal rather than pickle. Note that requires both ends to be running the same python version. Be aware of the obvious security issues of running code that came from remote machine, either because the remote machine itself may be untrusted or compromised, or because the network between the two machines may be compromised (remote machine is being spoofed or commnications are being modified). -- http://mail.python.org/mailman/listinfo/python-list
Re: gui doubt
On 06/17/2010 01:04 AM, Stephen Hansen wrote: On 6/16/10 10:40 PM, madhuri vio wrote: if i want to create a button which performs the transcription of dna to rna using tkinter in a gui... can u give me the method... You can not possibly be serious. Oh, it's not that bad [dna2rna.py]## import Tkinter as tk root = tk.Tk() root.title(dna2rna) def translate(): from tkMessageBox import showinfo showinfo(Translate, Do some translating here.\n Maybe in another thread so the GUI doesn't stall. ) # do your actual work here tk.Button( root, text=Translate!, command=translate ).pack() root.mainloop() ## Now all one needs to do is fill in the blanks in the Translate call to do the actual work...an exercise left for the professional in the field. ;-) I suspect the GUI may need to be a bit more complex than that which might lead to wanting a more object-oriented code-base, but I leave that too as an exercise for the reader. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
On Thu, 2010-06-17 at 07:37 -0700, Paul Rubin wrote: Matteo Landi landima...@gmail.com writes: If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? Use marshal rather than pickle. Note that requires both ends to be I could be wrong, but it seems functions are not marshable objects, is it right? running the same python version. Be aware of the obvious security issues of running code that came from remote machine, either because the remote machine itself may be untrusted or compromised, or because the network between the two machines may be compromised (remote machine is being spoofed or commnications are being modified). -- Matteo Landi http://www.matteolandi.net -- http://mail.python.org/mailman/listinfo/python-list
RE: gui doubt
On 06/17/2010 01:04 AM, Stephen Hansen wrote: On 6/16/10 10:40 PM, madhuri vio wrote: if i want to create a button which performs the transcription of dna to rna using tkinter in a gui... can u give me the method... You can not possibly be serious. Oh, it's not that bad [dna2rna.py]## import Tkinter as tk root = tk.Tk() root.title(dna2rna) def translate(): from tkMessageBox import showinfo showinfo(Translate, Do some translating here.\n Maybe in another thread so the GUI doesn't stall. ) # do your actual work here tk.Button( root, text=Translate!, command=translate ).pack() root.mainloop() ## Now all one needs to do is fill in the blanks in the Translate call to do the actual work...an exercise left for the professional in the field. ;-) I suspect the GUI may need to be a bit more complex than that which might lead to wanting a more object-oriented code-base, but I leave that too as an exercise for the reader. -tkc Seems like a simple problem... or am I missing something? def translate(): return dna.replace(d, r) Cheers, Drea -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
Matteo Landi landima...@gmail.com writes: I could be wrong, but it seems functions are not marshable objects, is it right? Hmm, you're right, you can marshal code objects, but you can't marshal a function directly. It's been a while since I've used marshal and I forgot how it works. You might be able to concoct something around it, but it could be messy. It may be simplest to send the other side a python source file that it can import. -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
On Thu, 2010-06-17 at 07:37 -0700, Paul Rubin wrote: Matteo Landi landima...@gmail.com writes: If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? Use marshal rather than pickle. Note that requires both ends to be I could be wrong, but it seems functions are not marshable objects, is it right? running the same python version. Be aware of the obvious security issues of running code that came from remote machine, either because the remote machine itself may be untrusted or compromised, or because the network between the two machines may be compromised (remote machine is being spoofed or commnications are being modified). -- Matteo Landi http://www.matteolandi.net -- http://mail.python.org/mailman/listinfo/python-list
Re: gui doubt
Andreas Tawn a écrit : On 06/17/2010 01:04 AM, Stephen Hansen wrote: On 6/16/10 10:40 PM, madhuri vio wrote: if i want to create a button which performs the transcription of dna to rna (snip the GUI part) Seems like a simple problem... or am I missing something? def translate(): return dna.replace(d, r) !-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
On 6/17/10 6:23 AM, Matteo Landi wrote: itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. You can pickle functions-- and classes, instances, and such-- just fine. If you're having specific difficulty with one instance of doing so, show the actual code. def test(one): ... print one + 1 ... import pickle outp = pickle.dumps(test) outp 'c__main__\ntest\np0\n.' fn = pickle.loads(outp) fn(1) 2 Now, complex stuff like classes and functions have to live in the same place with pickle, and it does need the source to be available and already imported, but it works fine. If by pickle a function you mean, take an arbitrary function and pickle it into some random destination and have it by itself still be enough to be executable, then no, pickle doesn't do that. To get that, you'd have to distribute the source to the destination and import it before-hand. That or do some crazy-complicated sort of code object marshalling and manipulation on the other side. I have no idea where to even begin in that situation (hw do you turn a code object into something you can actually pass arguments to, hmm? I only know how to 'exec' a bare code object) -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: gui doubt
On 06/17/2010 10:07 AM, Andreas Tawn wrote: On 6/16/10 10:40 PM, madhuri vio wrote: which performs the transcription of dna to rna [snip] Seems like a simple problem... or am I missing something? def translate(): return dna.replace(d, r) And I understand people in bioinformatics get paid big money...for that!? ;-) -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: gui doubt
On 06/17/10 01:40, quoth madhuri vio: if i want to create a button which performs the transcription of dna to rna using tkinter in a gui... can u give me the method... -- madhuri :) Dear Madasahatter. You need to read the description below on how to properly implement and use the unsubscribe button. After use, please take a piece of cardboard and hand it around your neck to announce your accomplishment. The algorithm below may need to be translated into python, but I would expect that this would be the easiest part of the problem. We all wish you the best of luck in your new venture as village idiot. In the future, please let the FBI know if you have any problems. From: Dr. Bryan Bledsoe bbled...@earthlink.net To: prehospitalcare List Member de...@world.std.com Subject: [prehospitalcare] How To Remove Yourself From The List Date: Sat, 10 Aug 2002 20:55:52 -0500 X-Mailer: Microsoft Outlook Express 6.00.2600. X-MDRemoteIP: 207.217.120.50 Sender: prehospitalc...@emsvillage.com X-Return-Path: prehospitalc...@emsvillage.com List-Unsubscribe: mailto:prehospitalcare-unsubscr...@emsvillage.com X-MDMailing-List: prehospitalc...@emsvillage.com X-MDSend-Notifications-To: prehospitalc...@emsvillage.com Reply-To: prehospitalc...@emsvillage.com Phil: You are WRONG. Here is how to unsubscribe from prehospitalc...@emsvillage.com: How to unsubscribe (as you requested) First, ask your Internet Provider to mail you an Unsubscribing Kit. Then follow these directions. The kit will most likely be the standard no-fault type. Depending on requirements, System A and/or System B can be used. When operating System A, depress lever and a plastic dalkron unsubscriber will be dispensed through the slot immediately underneath. When you have fastened the adhesive lip, attach connection marked by the large X outlet hose. Twist the silver- coloured ring one inch below the connection point until you feel it lock. The kit is now ready for use. The Cin-Eliminator is activated by the small switch on the lip. When securing, twist the ring back to its initial condition, so that the two orange lines meet. Disconnect. Place the dalkron unsubscriber in the vacuum receptacle to the rear. Activate by pressing the blue button. The controls for System B are located on the opposite side. The red release switch places the Cin-Eliminator into position; it can be adjusted manually up or down by pressing the blue manual release button. The opening is self-adjusting. To secure after use, press the green button, which simultaneously activates the evaporator and returns the Cin-Eliminator to its storage position. You may log off if the green exit light is on over the evaporator. If the red light is illuminated, one of the Cin-Eliminator requirements has not been properly implemented. Press the List Guy call button on the right of the evaporator. He will secure all facilities from his control panel. To use the Auto-Unsub, first undress and place all your clothes in the clothes rack. Put on the velcro slippers located in the cabinet immediately below. Enter the shower, taking the entire kit with you. On the control panel to your upper right upon entering you will see a Shower seal button. Press to activate. A green light will then be illuminated immediately below. On the intensity knob, select the desired setting. Now depress the Auto-Unsub activation lever. Bathe normally. The Auto-Unsub will automatically go off after three minutes unless you activate the Manual off override switch by flipping it up. When you are ready to leave, press the blue Shower seal release button. The door will open and you may leave. Please remove the velcro slippers and place them in their container. If you prefer the ultrasonic log-off mode, press the indicated blue button. When the twin panels open, pull forward by rings A B. The knob to the left, just below the blue light, has three settings, low, medium or high. For normal use, the medium setting is suggested. After these settings have been made, you can activate the device by switching to the ON position the clearly marked red switch. If during the unsubscribing operation you wish to change the settings, place the manual off override switch in the OFF position. You may now make the change and repeat the cycle. When the green exit light goes on, you may log off and have lunch. Please close the door behind you. Bryan E. Bledsoe, DO, FACEP Midlothian, Texas All outgoing email scanned by Norton Antivirus and guaranteed virus free or your money back. - Original Message - From: Philip L. Hayes To: prehospitalcare List Member Sent: Saturday, August 10, 2002 7:50 PM Subject: [prehospitalcare] How To Remove Yourself From The List Hi Everybody- To remove yourself from the list serv, simply follow the instructions at the bottom of every e-mail. Sending an unsubscribe or remove command to the list will not do it. Phil Hayes EMS Village Support -Original Message- From:
Re: Serializing functions
On Thu, 2010-06-17 at 08:31 -0700, Stephen Hansen wrote: On 6/17/10 6:23 AM, Matteo Landi wrote: itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. You can pickle functions-- and classes, instances, and such-- just fine. If you're having specific difficulty with one instance of doing so, show the actual code. def test(one): ... print one + 1 ... import pickle outp = pickle.dumps(test) outp 'c__main__\ntest\np0\n.' fn = pickle.loads(outp) fn(1) 2 Now, complex stuff like classes and functions have to live in the same place with pickle, and it does need the source to be available and already imported, but it works fine. If by pickle a function you mean, take an arbitrary function and pickle it into some random destination and have it by itself still be enough to be executable, then no, pickle doesn't do that. To get that, you'd have to distribute the source to the destination and import it before-hand. This is the problem, and I excuse me if I ain't been clear enough while showing it inside my previous email. That or do some crazy-complicated sort of code object marshalling and manipulation on the other side. I have no idea where to even begin in that situation (hw do you turn a code object into something you can actually pass arguments to, hmm? I only know how to 'exec' a bare code object) So it seems one should go for sending the function and the module with its definition in order to make the remote side able to execute it. I'm curious to see how picloud is able to discover the needed modules, sources etc etc to run the function specified inside picloud.call(); it seems not an easy task. -- Matteo Landi http://www.matteolandi.net -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
Am Donnerstag, den 17.06.2010, 08:18 -0700 schrieb Paul Rubin: Matteo Landi landima...@gmail.com writes: I could be wrong, but it seems functions are not marshable objects, is it right? Hmm, you're right, you can marshal code objects, but you can't marshal a function directly. It's been a while since I've used marshal and I forgot how it works. You might be able to concoct something around it, but it could be messy. It may be simplest to send the other side a python source file that it can import. There was a similar thread a while ago. You can marshal the functions code object and create a new function on the remote side using this code object. import marshal def spam(): pass now marshal the code object s = marshal.dumps(spam.func_code) On the remote side: import marshal import types code = marshal.loads(s) spam = types.FunctionType(code, globals()) This works as long as you are using byte code compatible Versions on both side. The creation of functions has also some optional arguments you must be aware of, in order to get the result you want. Look at help(types.FunctionType) for further information. -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
Am Donnerstag, den 17.06.2010, 18:03 +0200 schrieb Andreas Löscher: Am Donnerstag, den 17.06.2010, 08:18 -0700 schrieb Paul Rubin: Matteo Landi landima...@gmail.com writes: I could be wrong, but it seems functions are not marshable objects, is it right? Hmm, you're right, you can marshal code objects, but you can't marshal a function directly. It's been a while since I've used marshal and I forgot how it works. You might be able to concoct something around it, but it could be messy. It may be simplest to send the other side a python source file that it can import. There was a similar thread a while ago. Ah I found it: Search for: Object serialization: transfer from a to b (non-implemented code on b) in this mailing list. Is there a good way to link a former thread? -- http://mail.python.org/mailman/listinfo/python-list
Efficiency/style issues of import module vs. from module import name, ...
Are there any efficiency or style guidelines regarding the choice of import module vs. from module import name, ...? If one only needs to import a few names from a module, are there specific benefits to explictly importing these names? My understanding is that both forms of the import command require the entire module to be processed. If this comes down purely to preference, are there PEP 8-like standards regarding which approach to use when? Thanks, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Upgrading from Python 2.6.5 w.r.t. matplotlib/numpy?
On 6/17/10 12:24 AM, Stephen Hansen wrote: On 6/16/10 10:18 PM, Mark Lawrence wrote: I'm like to go direct to Python 3.1 if possible, but if necessary I'll happily use Python 2.7 as an interim measure. However I'm uncertain as to the status of matplotlib and its dependency on numpy. I've tried googling their development mailing lists but don't really understand what the current situation is. Asking those mailing lists is probably the best course. Could somebody please recommend whether I take the direct or indirect route to Python 3.1. FWIW I'm on Windows Vista. Numpy isn't available for 3.1 yet. IIUC, its not That Terribly Awfully Long Away (meaning, some indeterminate time probably counted in months and not years), but its not there yet. I believe it builds and passes most tests. Maybe not on Vista, though. -- 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: gui doubt
On 6/17/10 10:38 AM, Tim Chase wrote:
On 06/17/2010 10:07 AM, Andreas Tawn wrote:
On 6/16/10 10:40 PM, madhuri vio wrote:
which performs the transcription of dna to rna
[snip]
Seems like a simple problem... or am I missing something?
def translate():
return dna.replace(d, r)
And I understand people in bioinformatics get paid big money...for
that!? ;-)
Actually, the full method is a lot more complicated:
def translate(dna):
return dna.replace('T', 'U')
--
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
--
http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
On 6/17/10 8:23 AM, Matteo Landi wrote: Some weeks ago, here on the mailing list I read about picloud[1], a python library used for cloud-computing; I was impressed by its simplicity, here is an example: import cloud def square(x): ... return x * x cloud.call(square, 10) cloud.result() 100 So, I tried to figure out how to achieve the same result, i.e. define a local generic function and send it somewhere for remote execution, and the get the result back. So I thought about serialization (pickle): I made a few tries and it seemed to work.. but I was wrong, because I never tried to load pickled data from another session different from the one used to pickle data itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? PiCloud's client library is LGPLed. Go take a look for yourself. It's pretty nifty. [Disclosure: My employer, Enthought, has partnered with PiCloud to provide our Enthought Python Distribution to PiCloud users. However, I say that it's nifty purely because it is.] -- 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
On 6/17/10 9:12 AM, pyt...@bdurham.com wrote: Are there any efficiency or style guidelines regarding the choice of import module vs. from module import name, ...? There are no legitimate efficiency issues. In theory, module.blah is slightly slower then blah, but that slightly is largely irrelevant in globals. If you need to do module.blah a lot in a loop, you want to re-bind it into a local anyways before that loop if performance starts mattering that much. Style wise, the only guideline is, from module import * is often (but not always) bad. It pollutes the namespace, making it difficult to know exactly what's defined and where it is defined. Multiple import *'s are especially bad. Explicitly importing certain names is perfectly fine. Its clear and explicit. Someone seeing, MyRandomClass can search in the code and they'll find that import and know precisely where to go to look for it. If one only needs to import a few names from a module, are there specific benefits to explictly importing these names? Clarity, sometimes. There is no general rule here though. It depends on the structure and layout. Its a case-by-case situation; is it more clear to your natural reading to have 'module.MyRandomThing' or just 'MyRandomThing' in your code? An example: let's say you have a handlers module containing certain... uh.. handlers.. you have defined for your application. You could either: import handlers Or: from handlers import MyHTTPHandler, MySMTPHandler, MyNNTPHandler In this case, I'd consider it possible that in code usage, its entirely sufficient to call MyHTTPHandler and have it be clear and understandable for future non-you coders. handlers.MyHTTPHandler is slightly more explicit, but due to the naming and structure of this specific code, redundant as well. That may not always hold true. Now, this is all IMHO: the style guide does not define any 'guidelines' on this, except that its okay to use from ... import ... to pull in classes and (implicitly) constants, and despite how the rules say 'one module per line' its OK to pull in more then one name -from- a module at once. My understanding is that both forms of the import command require the entire module to be processed. Yes. from module import name is just a shortcut for: import module name = module.name -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
super() woes (n00b)
I cannot get right the super() function: Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. No Subprocess class P: def __init__(__class__,self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) x=C() That is more or less the text from the Quick Python Book. What am I doing wrong? -- The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already. -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
Stephen Hansen wrote: On 6/17/10 9:12 AM, pyt...@bdurham.com wrote: Now, this is all IMHO: the style guide does not define any 'guidelines' on this, except that its okay to use from ... import ... to pull in classes and (implicitly) constants, and despite how the rules say 'one module per line' its OK to pull in more then one name -from- a module at once. What do you mean by (implicitly) constants? My understanding is that both forms of the import command require the entire module to be processed. Yes. from module import name is just a shortcut for: import module name = module.name There should also be a third line: del module ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
On Thu, 17 Jun 2010 16:36:10 +, Deadly Dirk wrote: I cannot get right the super() function: Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. No Subprocess class P: def __init__(__class__,self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) x=C() That is more or less the text from the Quick Python Book. What am I doing wrong? I tried this, too: class C(P): def __init__(self): super(__class__).__init__(self) print(I am a member of class C) x=C() Traceback (most recent call last): File pyshell#30, line 1, in module x=C() File pyshell#29, line 3, in __init__ super(__class__).__init__(self) TypeError: must be type, not C -- The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already. -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
On 6/17/10 10:01 AM, Ethan Furman wrote: Stephen Hansen wrote: On 6/17/10 9:12 AM, pyt...@bdurham.com wrote: Now, this is all IMHO: the style guide does not define any 'guidelines' on this, except that its okay to use from ... import ... to pull in classes and (implicitly) constants, and despite how the rules say 'one module per line' its OK to pull in more then one name -from- a module at once. What do you mean by (implicitly) constants? Quote, PEP-8: - Imports should usually be on separate lines, e.g.: Yes: import os import sys No: import sys, os it's okay to say this though: from subprocess import Popen, PIPE It explicitly states later its entirely OK to import classes. It never says anything else directly, except in the example given, it shows you importing a constant. So, its giving implicit approval to that without really directly saying anything about it. My understanding is that both forms of the import command require the entire module to be processed. Yes. from module import name is just a shortcut for: import module name = module.name There should also be a third line: del module You're right, I missed that. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Overriding __setattr__ of a module - possible?
On 6/17/2010 12:25 AM, Gabriel Genellina wrote: Note the fake.g(8) call: __setattr__ wasn't called. If the OP wants to trace assignments to global variables, this becomes a problem. A function defined in a module holds a reference to the module's __dict__ in its func_globals attribute. Getting and setting global variables goes directly to this dictionary, and does not use the module object at all. Even worse, the LOAD_GLOBAL/STORE_GLOBAL opcodes (which implement getting and setting global variables) assume func_globals is a true dictionary and bypass any overriden __getitem__/__setitem__ methods (an optimization, surely). I'm afraid it will be hard to intercept global variable usage in these circumstances. OK, thanks. You can't actually replace __setattr__ for a module, and the module as class hack is iffy. I didn't really think this would work, but it was worth a try. I'm trying out a proof of concept implementation for a new approach to safe threading. It's somewhat similar in concept to Alan Olsen's scheme. The basic difference is that once the program goes multi-thread, code objects and some other bindings are locked down and become unchangeable. Olsen was climbing the walls trying to get the locking right for the awful cases like redefining a function while another thread is inside it. I'm trying to lock out some of those cases. If you do that, removing the GIL requires less pain than Olsen experienced. The key idea is that the use cases for most of Python's code dynamism are during setup and initialization. You usually don't change code once the program has gone into its heavy parallel processing phase. This suggests a practical compromise. More on this once I have something people can download and try. I'm doing a test implementation in Python so people can try the concept and see if it works in practice. It won't go fast; it's just to give a feel for what it would be like. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
Stephen Hansen wrote: On 6/17/10 10:01 AM, Ethan Furman wrote: Stephen Hansen wrote: On 6/17/10 9:12 AM, pyt...@bdurham.com wrote: Now, this is all IMHO: the style guide does not define any 'guidelines' on this, except that its okay to use from ... import ... to pull in classes and (implicitly) constants, and despite how the rules say 'one module per line' its OK to pull in more then one name -from- a module at once. What do you mean by (implicitly) constants? Quote, PEP-8: - Imports should usually be on separate lines, e.g.: Yes: import os import sys No: import sys, os it's okay to say this though: from subprocess import Popen, PIPE It explicitly states later its entirely OK to import classes. It never says anything else directly, except in the example given, it shows you importing a constant. So, its giving implicit approval to that without really directly saying anything about it. Thanks for the clarification -- I was reading it as constants being implicitly imported, and I knew that wasn't so! ;) ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
On Thu, Jun 17, 2010 at 12:58 PM, Stephen Hansen
me+list/pyt...@ixokai.io wrote:
On 6/17/10 10:01 AM, Ethan Furman wrote:
Stephen Hansen wrote:
On 6/17/10 9:12 AM, pyt...@bdurham.com wrote:
Now, this is all IMHO: the style guide does not define any 'guidelines'
on this, except that its okay to use from ... import ... to pull in
classes and (implicitly) constants, and despite how the rules say 'one
module per line' its OK to pull in more then one name -from- a module at
once.
What do you mean by (implicitly) constants?
Quote, PEP-8:
- Imports should usually be on separate lines, e.g.:
Yes: import os
import sys
No: import sys, os
it's okay to say this though:
from subprocess import Popen, PIPE
It explicitly states later its entirely OK to import classes. It never
says anything else directly, except in the example given, it shows you
importing a constant. So, its giving implicit approval to that without
really directly saying anything about it.
You want to import a name that is itself a namespace; preferably a
module or package and sometimes a class. Importing constants can lead
to trouble. ex/
from settings import DEBUG
if DEBUG: log('debug is on!')
The value of the flag gets fetched at import time. If code in another
module updates settings.DEBUG later your module won't see it. ditto
for exceptions.
-Jack
--
http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
Jack Diederich wrote:
You want to import a name that is itself a namespace; preferably a
module or package and sometimes a class. Importing constants can lead
to trouble. ex/
from settings import DEBUG
if DEBUG: log('debug is on!')
The value of the flag gets fetched at import time. If code in another
module updates settings.DEBUG later your module won't see it. ditto
for exceptions.
-Jack
The idea behind constants is that they are... um... constant. ;) I
imagine exceptions don't get changed often either. (At least, I never
change mine.)
If you have a setting that may change, don't call it a constant and name
it accordingly.
~Ethan~
--
http://mail.python.org/mailman/listinfo/python-list
Re: Efficiency/style issues of import module vs. from module import name, ...
On 6/17/10 10:22 AM, Jack Diederich wrote:
On Thu, Jun 17, 2010 at 12:58 PM, Stephen Hansen
It explicitly states later its entirely OK to import classes. It never
says anything else directly, except in the example given, it shows you
importing a constant. So, its giving implicit approval to that without
really directly saying anything about it.
You want to import a name that is itself a namespace; preferably a
module or package and sometimes a class. Importing constants can lead
to trouble. ex/
from settings import DEBUG
if DEBUG: log('debug is on!')
The value of the flag gets fetched at import time. If code in another
module updates settings.DEBUG later your module won't see it. ditto
for exceptions.
That argument is invalid on its face; a constant, by definition, is not
to be modified. The convention (recently adopted officially by PEP-8) of
ALL_CAPS makes this promise: this is a static piece of data.
That its possible for misbehaving code to change it due to Python's lax
nature doesn't mean you should organize or write your code in such a way
to take that into account. People can shoot themselves in the foot.
If people do stupid things after writing code that makes promises, stuff
that relies upon the explicit promises made may fail, and that's their
own dumb fault.
And the only time someone is going to go 'change' an exception that
lives in the top-level of some other module is if they're
monkey-patching, which while a legitimate technique to achieve certain
ends when using other people's code-- is also not a technique which has
any place in consideration of the design phase of the original system
itself.
Certainly, importing a non-constant immutable piece of data is
problematic in theory, as it can be rebound and problems arise.
Number of times I've -seen- non-constant immutable data in the top-level
of a module: 0*.
--
Stephen Hansen
... Also: Ixokai
... Mail: me+list/python (AT) ixokai (DOT) io
... Blog: http://meh.ixokai.io/
P.S. Outside of a throw-away script which is not meant to be imported,
at least.
signature.asc
Description: OpenPGP digital signature
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python OpenSSL library
On Tue, 15 Jun 2010 19:56:46 -0700 John Nagle na...@animats.com wrote: http://bugs.python.org/issue1589 [...] The typical Python user will expect SSL checking for URL opening to behave like a browser does. They won't be up to speed on the internal mechanics of X.509 certificates. The default case should be to require a hostname match (considering certificate wildcards, multiple common names, multiple alt names, etc.). Expecting the caller to do this check is unreasonable. It's about 70 lines of python code to cover all the cases. And that's without proper support for error reporting for internationalized host names. If you are interested in this, I would encourage you to post a patch or a proposal on the aforementioned bug entry so as to add a hostname checking function to the SSL module. (m2crypto has its own implementation that can serve as a source of inspiration, and test cases) If/when that is done, the second step would be to integrate it by default with the urllib module, and perhaps other ones. Thanks Antoine. -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
On Thu, 2010-06-17 at 16:36 +, Deadly Dirk wrote: I cannot get right the super() function: Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. No Subprocess class P: def __init__(__class__,self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) x=C() That is more or less the text from the Quick Python Book. What am I doing wrong? super gives you an instantiated version of the super class, which means that you don't have to explicitly send self to any methods you call on it. So use `super().__init__()` instead. -- The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already. -- http://mail.python.org/mailman/listinfo/python-list
The inverse of .join
What's the best way to do the inverse operation of the .join function? -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
Neil Cerutti wrote: What's the best way to do the inverse operation of the .join function? -- Neil Cerutti split -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
I found few error in your code: 1 the constructor of P class seems to be wrong: class P(object): ...def __init__(self): ...print(I am a member of class P) ... 2 super() works with new style classes, i.e. the ones which inherit from 'object' class P: ...def __init__(__class__,self): ...print(I am a member of class P) ... 3 super() need a type as first argument, and an instance as second one: class C(P): ...def __init__(self): ...super().__init__(self) ...print(I am a member of class C) Now it should work (not tested). On Thu, Jun 17, 2010 at 6:53 PM, Deadly Dirk d...@plfn.invalid wrote: On Thu, 17 Jun 2010 16:36:10 +, Deadly Dirk wrote: I cannot get right the super() function: Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. No Subprocess class P: def __init__(__class__,self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__(self) print(I am a member of class C) x=C() That is more or less the text from the Quick Python Book. What am I doing wrong? I tried this, too: class C(P): def __init__(self): super(__class__).__init__(self) print(I am a member of class C) x=C() Traceback (most recent call last): File pyshell#30, line 1, in module x=C() File pyshell#29, line 3, in __init__ super(__class__).__init__(self) TypeError: must be type, not C -- The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already. -- http://mail.python.org/mailman/listinfo/python-list -- Matteo Landi http://www.matteolandi.net/ -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
Neil Cerutti wrote: What's the best way to do the inverse operation of the .join function? .split, possibly, although there will be problems if the string contains other occurrences of the separator. -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti ne...@norwich.edu wrote: What's the best way to do the inverse operation of the .join function? Use the str.split method? -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
On Thu, 17 Jun 2010 13:48:45 -0400, J. Cliff Dyer wrote: super gives you an instantiated version of the super class, which means that you don't have to explicitly send self to any methods you call on it. So use `super().__init__()` instead. Thanks. Interestingly enough, it works in Python 3, which is what the book is about. It doesn't work in Python 2.6 3.1: Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. No Subprocess class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__() print(I am a member of class C) x=C() I am a member of class P I am a member of class C 2.6: Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] on linux2 Type copyright, credits or license() for more information. Personal firewall software may warn about the connection IDLE makes to its subprocess using this computer's internal loopback interface. This connection is not visible on any external interface and no data is sent to or received from the Internet. IDLE 2.6.4 No Subprocess class P: def __init__(self): print(I am a member of class P) class C(P): def __init__(self): super().__init__() print(I am a member of class C) x=C() Traceback (most recent call last): File pyshell#2, line 1, in module x=C() File pyshell#1, line 3, in __init__ super().__init__() TypeError: super() takes at least 1 argument (0 given) -- The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already. -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
On Thu, Jun 17, 2010 at 10:51 AM, Matteo Landi landima...@gmail.com wrote: I found few error in your code: 1 the constructor of P class seems to be wrong: class P(object): ... def __init__(self): ... print(I am a member of class P) ... 2 super() works with new style classes, i.e. the ones which inherit from 'object' The OP is using Python 3.1. All classes in Python 3.x are new style. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python OpenSSL library
On Thu, Jun 17, 2010 at 10:49 AM, Antoine Pitrou solip...@pitrou.net wrote: On Tue, 15 Jun 2010 19:56:46 -0700 John Nagle na...@animats.com wrote: http://bugs.python.org/issue1589 [...] The typical Python user will expect SSL checking for URL opening to behave like a browser does. They won't be up to speed on the internal mechanics of X.509 certificates. The default case should be to require a hostname match (considering certificate wildcards, multiple common names, multiple alt names, etc.). Expecting the caller to do this check is unreasonable. It's about 70 lines of python code to cover all the cases. And that's without proper support for error reporting for internationalized host names. If you are interested in this, I would encourage you to post a patch or a proposal on the aforementioned bug entry so as to add a hostname checking function to the SSL module. (m2crypto has its own implementation that can serve as a source of inspiration, and test cases) If/when that is done, the second step would be to integrate it by default with the urllib module, and perhaps other ones. John, I'll do this if you don't want to. Let me know. Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list
Re: super() woes (n00b)
Deadly Dirk wrote: On Thu, 17 Jun 2010 13:48:45 -0400, J. Cliff Dyer wrote: super gives you an instantiated version of the super class, which means that you don't have to explicitly send self to any methods you call on it. So use `super().__init__()` instead. Thanks. Interestingly enough, it works in Python 3, which is what the book is about. It doesn't work in Python 2.6 as Thomas Jollans said days ago: but you should really install Python 3.1 (it's in ubuntu, as others have said!) because you will almost certainly hit into other snags. or, as Gabriele Lanaro said in that same thread: else take a book that covers python 2.x syntax Cut-and-pasting-ly yours, ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
Import fails (newbie)
Hello,
I'm a newbie and I have a small problem. After invoking IDLE --
Python 3.1.2 (r312:79149, Mar 21 2010, 00:41:52) [MSC v.1500 32 bit
(Intel)] on win32
Type copyright, credits or license() for more information.
import os,glob
os.chdir('D:/Python_Programs')
print(os.getcwd())
D:\Python_Programs
print(glob.glob('*.*'))
['humansize.py', 'humansize.pyc']
import humansize
Traceback (most recent call last):
File pyshell#5, line 1, in module
import humansize
ImportError: No module named humansize
In a DOS command window I have no problems with the program:
Directory of D:\Python_Programs
17/06/2010 01:56 PMDIR .
17/06/2010 01:56 PMDIR ..
17/06/2010 02:53 PM 1,266 humansize.py
17/06/2010 01:56 PM 1,315 humansize.pyc
2 File(s) 2,581 bytes
2 Dir(s) 104,122,085,376 bytes free
D:\Python_Programsc:\python31\python humansize.py
1.0 TB
931.3 GiB
This 'humansize.py' program I got from the book 'Dive Into Python 3'.
I don't know if you need to know the source.
Can someone explain why the 'import' fails?
Thanks,
Mike
--
http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On 2010-06-17, Ian Kelly ian.g.ke...@gmail.com wrote: On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti ne...@norwich.edu wrote: What's the best way to do the inverse operation of the .join function? Use the str.split method? split is perfect except for what happens with an empty string. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Processing HTML form
Hi, I am a newbie to anything web related, I know a bit of HTML though. I've been programing in python for a year or so so I know the language at an intermediate level. I am wondering if its possible to get info from an HTML form and pass it to my python code and return a page based on the code executed. All of my web searches have been fruitless as I quickly get lost in the jargon and perhaps not sure what phrase i should search. Any help would be appreciated. Thank you, Bradley -- http://mail.python.org/mailman/listinfo/python-list
Running a program from another program.
I have a program called increment.py as follows:
#!/usr/bin/python
n = 0
while True:
n = int(raw_input(n)) + 1
This is probably very easy to understand, but I want to run this program
from another python program.
Below is an attempt
from subprocess import *
p = Popen([python, increment.py], stdin=PIPE,
stdout=PIPE)
p.communicate(5)
Traceback (most recent call last):
File increment.py, line 4, in module
n = int(raw_input(n)) + 1
EOFError: EOF when reading a line
('06', None)
p.communicate(7)
Traceback (most recent call last):
File stdin, line 1, in module
File /usr/lib/python2.6/subprocess.py, line 701, in
communicate
return self._communicate(input)
File /usr/lib/python2.6/subprocess.py, line 1184, in
_communicate
self.stdin.flush()
ValueError: I/O operation on closed file
How do I make sure the inputstream stays open after the first call to
communicate?
--
http://mail.python.org/mailman/listinfo/python-list
Black-Jewish History FAQ - Is The Secret Relationshi p between blacks and jews a “hate literature”?
http://www.blacksandjews.com/JewsBlackHolocaust.html Blacks and Jews have been involved in a re-evaluation of their current and historical relationship. Events of the past several years have raised both tensions and the level of rhetoric coming from all sides. The Secret Relationship Between Blacks and Jews is a historical accounting of the part of the relationship that has been ignored by both Blacks and Jews. http://www.blacksandjews.com/BlackJewishFAQ.html http://www.blacksandjews.com/BlackJewishFAQ.Hate.html Black-Jewish History FAQ - Is The Secret Relationship between blacks and jews a “hate literature”? No. It is truth literature. The release in 1991 of The Secret Relationship Between Blacks and Jews, Vol. 1, offered the world a glimpse of how the so-called chosen people have historically related to the Blacks with whom they have come into contact. Jews, upset with the revelation, have reacted by condemning the book as “unscholarly” and “hate literature.” But at the same time many, many academic libraries have quietly bought the book and put it in their collections. At least 115 libraries around the world now have the book in their collections, including such prestigious institutions as Yale, Harvard, Princeton, Brandeis, Yeshiva University, the Jewish Theological Seminary, Brown University, Stanford University, even Cambridge University in London, England, and others in Germany and New Zealand, all of which have the book on their library shelves. Some libraries have the book but keep it locked away in a special location, requiring ID in order to see it. At one point the Brandeis University library kept it, along with other important works, in what they called “The Cage.” The Library of Congress wrote to the NOI and demanded a copy (which was supplied). There have been more than a dozen books and dozens more articles written to try to refute The Secret Relationship Between Blacks and Jews, Vol. 1. One scholar called this new body of scholarship spawned by The Secret Relationship a “cottage industry.” The Jewish leaders have held high-level meetings at retailers like Barnes Noble and Borders about what to do with this bestseller. One store in California was putting one of these “refutation” books in the bags of any Black customer who bought any book on any topic. Canada was stopping The Secret Relationship at the border and labeling it “contraband.” On the official form the border agents could check one of three categories: “pornography,” “hate literature,” or “other.” They checked “other.” Libraries list the book as “history”—not “hate literature”— and have deemed it too important to the discourse on the Black–Jewish relationship to exclude it. Other Libraries that own Volume 1 include: FOREIGN London Library of Haringay, UK London Library of Newham, UK Yorkshire Library, UK Senckenberg Univ., Frankfurt, Germany Univ. of Otago Library, New Zealand Vancouver Public Library Univ. of the W. Indies, Barbados British Library University of Toronto Libraries UNITED STATES New York University Smith College Amherst College College of the Holy Cross Northeastern University UCLA Library University of California, Davis University of California, Irvine University of San Diego University of Southern California University of California Berkeley Hoover Institute, Stanford, CA University of Texas, Austin Texas AM University, Kingsville Maricopa Community Colleges Whitman College, Walla Walla, WA Multnomah County Library Pierce College Library University of Nevada, Reno Rice University, Fondren Library Wisconsin Historical Society Atlanta-Fulton Public Library Doane College California State, Northridge Florida Atlantic University Missouri State University Grambling State University Pittsburg State University Southern University in New Orleans Sam Houston State University University of Miami University of West Georgia University of Iowa Library University of Florida Saint Louis Public Library Southeast Missouri State University Mervyn H. Sterne Library Grinnell College University of Chicago Chicago Public Library Loyola University Libraries Saint Xavier University Library Milwaukee Library System Western Kentucky University University of Illinois Savannah State University Fayetteville State University Michigan State University Libraries Antioch College Barber-Scotia College Davidson College Library Allen County Public Library Calvin College Theological Seminary Indiana State University University of Akron Detroit Public Library Duke University Library North Carolina State University Univ. of North Carolina, Chapel Hill Ohio State University Toledo-Lucas County Public Library Eastern Michigan University Library University of Michigan Library Bowling Green State University Bucknell University Concordia Univ. Library McGill University Delaware State University University of Maryland, College Park University of Pittsburgh Hampton University Elizabeth City State University Bowdoin College Temple University
* Black-Jewish History FAQ - Is The Secret Relations hip between blacks and jews a “hate literature”? *
http://www.blacksandjews.com/JewsBlackHolocaust.html Jews and the Black Holocaust - What are the Issues? Blacks and Jews have been involved in a re-evaluation of their current and historical relationship. Events of the past several years have raised both tensions and the level of rhetoric coming from all sides. The Secret Relationship Between Blacks and Jews is a historical accounting of the part of the relationship that has been ignored by both Blacks and Jews. Most people are not even aware of the extensive record of encounters between the two groups prior to the 20th century. The Honorable Louis Farrakhan referred to this well-documented history in 1984 and was immediately labeled an anti-Semite. Merely questioning the belief that Jews were co-sufferers in the Black slave experience draws angry rebukes from Jews of all stripes. The book in question presents indisputable historical data from census records, wills, Jewish historians and scholars, rabbinical sermons, port records, court records, runaway slave notices, slave sale advertisements, etc., which forces all sides to grapple with the long- held mythology that Black people always found a friend in the Jews. Some Jews and their dutiful negros have hired the services of Dr. Harold Brackman of the Simon Wiesenthal Center in an effort to preserve the comfortable mythology which has obscured the actual historical record. But unbeknownst to them, Dr. Brackman's 1977 unpublished Ph.D. dissertation, entitled The Ebb and Flow of Conflict, goes far beyond The Secret Relationship in its claims of Jewish conspiracy in the Biblical origin of White supremacy. He clearly states that Jewish Talmudic scholars invented the Hamitic Myth which, through the story of Noah, everlastingly assigned to the African the role of slave and divinely cursed servant of White people. According to Dr. Tony Martin's book, The Jewish Onslaught, the Jewish invention of the Hamitic Myth provided the moral pretext upon which the entire trade grew and flourished. There is no denying, said Brackman of the story of Noah, that the Babylonian Talmud was the first source to read a Negrophobic content into the episode... Brackman pointed out further that two third century Jewish Sages provided homosexual embellishments for the Biblical story as well. This curse was the absolute basis for the Europeans' choice of dark- skinned Africans for chattel slavery. Many denominations of Christianity, Islam and Judaism believe it and teach it to this very moment! Southern plantation owners attacked the Abolitionists with it; its teaching was the foundation of the slaves' permitted religion; Black inferiority is based on it; the Ku Klux Klan relies on it; even the Mormons officially taught it until 1978. When the Jews invented it and promoted it to the world they sentenced the Black Race to a holocaust the likes of which no people have ever suffered. Hate teaching will forever be defined by this wicked belief system brought to us in the Jewish Holy Talmud via Harold Brackman. The critics curiously use a Harvard English teacher, Henry Louis Gates, to offer historical clarity. Gates exhibits no evidence that he even read the book in his oft-quoted NY Times opinion. His willingness to make asinine historical claims with the glaring absence of support from reputable Black or Jewish historians proves Adam Clayton Powell's axiom: Harvard has ruined more negroes than bad whiskey. Overwhelming Evidence The history that the old Black-Jewish Coalition clumsily avoids is the entire three century history of Jewish presence in South America and the Caribbean. But other highly acclaimed Jewish scholars have not been so blind: •Lee M. Friedman, a one-time president of the American Jewish Historical Society, wrote that in Brazil, where most of the Africans actually went, the bulk of the slave trade was in the hands of Jewish settlers. •Marcus Arkin wrote that the Jews of Surinam used many thousands of Black slaves. •Herbert I. Bloom wrote that the slave trade was one of the most important Jewish activities here (in Surinam) as elsewhere in the colonies. He even published a 1707 list of Jewish buyers by name with the number of Black humans they purchased. •Cecil Roth, writer of 30 books and hundreds of articles on Jewish history, wrote that the slave revolts in parts of South America were largely directed against [Jews] as being the greatest slave-holders of the region. •I gather, wrote Jewish scholar Wilfred Samuels, that the Jews [of Barbados] made a good deal of their money by purchasing and hiring out negroes... •According to the Jewish historians, all Barbadian Jews owned slaves - even the rabbi had the enjoyment of his own two negro attendants. •In Curaçao which was a major slave trading depot, Isaac and Susan Emmanuel report that the shipping business was mainly a Jewish enterprise. •Says yet another Jewish writer of the Jews of Curaçao, Almost every Jew bought from one to nine slaves for
Re: The inverse of .join
Neil Cerutti wrote:
On 2010-06-17, Ian Kelly ian.g.ke...@gmail.com wrote:
On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti
ne...@norwich.edu wrote:
What's the best way to do the inverse operation of the .join
function?
Use the str.split method?
split is perfect except for what happens with an empty string.
I see what you mean.
This is consistent:
','.join([''])
''
''.split(',')
['']
but this isn't:
','.join([])
''
''.split(',')
['']
An empty string could be the result of .join(['']) or .join([]).
Should .split grow an addition keyword argument to specify the desired
behaviour? (Although it's simple enough to define your own function.)
--
http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
On 2010-06-17, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I am a newbie to anything web related, I know a bit of HTML though. I've been programing in python for a year or so so I know the language at an intermediate level. I am wondering if its possible to get info from an HTML form and pass it to my python code and return a page based on the code executed. All of my web searches have been fruitless as I quickly get lost in the jargon and perhaps not sure what phrase i should search. Any help would be appreciated. It's not clear what you want. Are you talking about Python code in an HTTP client or an HTTP server? -- Grant Edwards grant.b.edwardsYow! ... I have read the at INSTRUCTIONS ... gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On 6/17/10 2:08 PM, Neil Cerutti wrote: On 2010-06-17, Ian Kellyian.g.ke...@gmail.com wrote: On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti ne...@norwich.edu wrote: What's the best way to do the inverse operation of the .join function? Use the str.split method? split is perfect except for what happens with an empty string. Why don't you try it and find out? -- 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On 6/17/10 12:44 PM, MRAB wrote:
Neil Cerutti wrote:
On 2010-06-17, Ian Kelly ian.g.ke...@gmail.com wrote:
On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti
ne...@norwich.edu wrote:
What's the best way to do the inverse operation of the .join
function?
Use the str.split method?
split is perfect except for what happens with an empty string.
I see what you mean.
This is consistent:
','.join([''])
''
''.split(',')
['']
but this isn't:
','.join([])
''
''.split(',')
['']
An empty string could be the result of .join(['']) or .join([]).
Should .split grow an addition keyword argument to specify the desired
behaviour? (Although it's simple enough to define your own function.)
Guido finds keyword-arguments-to-change-behavior to be unPythonic, IIRC.
It generally means 'make a new API'. But, the question is-- is it worth
the mental strain of a new API?
This is such an extreme edge case, having to do:
if blah:
result = blah.split(',')
else:
result = []
Is really not asking too much, I think.
--
Stephen Hansen
... Also: Ixokai
... Mail: me+list/python (AT) ixokai (DOT) io
... Blog: http://meh.ixokai.io/
signature.asc
Description: OpenPGP digital signature
--
http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
On 6/17/10 12:13 PM, Laurent Verweijen wrote: How do I make sure the inputstream stays open after the first call to communicate? This was just asked a few days ago in different words-- check out the thread, a couple solutions are offered. In short, you need to make stdin/stdout non-blocking: http://groups.google.com/group/comp.lang.python/browse_thread/thread/066de1c0fd38642f# -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Possible to reach back in stack and grab calling function's locals()?
Is there an elegant way to reach back in the stack and grab the calling function's copy of locals()? I'm working on a library that does lots of textmerge operations and am looking for a way to eliminate the need for many of the calls to our library to have to explictly pass locals() to our formatting functions. Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On 2010-06-17, Robert Kern robert.k...@gmail.com wrote: On 6/17/10 2:08 PM, Neil Cerutti wrote: On 2010-06-17, Ian Kellyian.g.ke...@gmail.com wrote: On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti ne...@norwich.edu wrote: What's the best way to do the inverse operation of the .join function? Use the str.split method? split is perfect except for what happens with an empty string. Why don't you try it and find out? I'm currently using the following without problems, while reading a data file. One of the fields is a comma separated list, and may be empty. f = rec['codes'] if f == : f = [] else: f = f.split(,) I just wondered if something smoother was available. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
Op donderdag 17-06-2010 om 12:51 uur [tijdzone -0700], schreef Back9: Hi, I have one byte data and want to know each bit info, I mean how I can know each bit is set or not? TIA def bitset(x, n): Return whether nth bit of x was set return bool(x (1 n)) -- http://mail.python.org/mailman/listinfo/python-list
Re: Serializing functions
I am one of the developer's of PiCloud. To answer your question, we wrote a custom subclass of Pickler to pickle functions. As Robert pointed out, the library is LGPL, so you can see (and use) the source code. I also presented the details on a poster at PyCon 2010. You can see it here: http://blog.picloud.com/?p=96 On Jun 17, 9:26 am, Robert Kern robert.k...@gmail.com wrote: On 6/17/10 8:23 AM, Matteo Landi wrote: Some weeks ago, here on the mailing list I read about picloud[1], a python library used for cloud-computing; I was impressed by its simplicity, here is an example: import cloud def square(x): ... return x * x cloud.call(square, 10) cloud.result() 100 So, I tried to figure out how to achieve the same result, i.e. define a local generic function and send it somewhere for remote execution, and the get the result back. So I thought about serialization (pickle): I made a few tries and it seemed to work.. but I was wrong, because I never tried to load pickled data from another session different from the one used to pickle data itself. If you try and pickle a function, it is not pickled as a whole, indeed, once you unpickle it, it will raise an exception telling you that the target function was not found in the current module. So I'm here, with nothing in my hands; how would you implement this? PiCloud's client library is LGPLed. Go take a look for yourself. It's pretty nifty. [Disclosure: My employer, Enthought, has partnered with PiCloud to provide our Enthought Python Distribution to PiCloud users. However, I say that it's nifty purely because it is.] -- 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
On Jun 17, 3:51 pm, Back9 backgoo...@gmail.com wrote: Hi, I have one byte data and want to know each bit info, I mean how I can know each bit is set or not? You want the bitwise-and operator, . For example, to check the least significant bit, bitwise-and with 1: 3 1 1 2 1 0 -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
On 6/17/10 12:51 PM, Back9 wrote: I have one byte data and want to know each bit info, I mean how I can know each bit is set or not? BIT_1 = 1 0 BIT_2 = 1 1 BIT_3 = 1 2 BIT_4 = 1 3 BIT_5 = 1 4 BIT_6 = 1 5 BIT_7 = 1 6 BIT_8 = 1 7 byte = 67 if byte BIT_1: ... print Bit 1 is set! ... else: ... print Bit 1 is not set! Bit 1 is set! if not byte BIT_6: ... byte = byte | BIT_6 ... print Bit 6 wasn't set, BUT NOW IS. Bit 6 wasn't set, BUT NOW IS. byte 99 (I added 'how to set a specific bit' just cuz) Basically, those BIT_X lines are creating numbers which have *only* the specified bit set. Then you do byte BIT_X, and that will return 0 if the byte doesn't have the specified bit in it. You can then set the bit with byte | BIT_X, and unset the bit with byte ^ BIT_X. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
On 17-6-2010 21:51, Back9 wrote: Hi, I have one byte data and want to know each bit info, I mean how I can know each bit is set or not? TIA Use bitwise and, for instance, to see if the third bit is set: byte = 0b if byte 0b0100: print bit is set -irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
I apologize in advance for my lack of knowledge, I really do not know. I would guess server but I quite honestly I am not clear what an 'HTTP client' or 'HTTP server' refers to. I am running a webpage and am serving it locally for the moment. I have a program that is already written in Python. I want to make the program available on the web where I receive user input from HTML forms. The user input will then be used as parameters for the program. I hope this clear things up. Thanks, Bradley On Thu, Jun 17, 2010 at 3:46 PM, Grant Edwards inva...@invalid.invalid wrote: On 2010-06-17, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I am a newbie to anything web related, I know a bit of HTML though. I've been programing in python for a year or so so I know the language at an intermediate level. I am wondering if its possible to get info from an HTML form and pass it to my python code and return a page based on the code executed. All of my web searches have been fruitless as I quickly get lost in the jargon and perhaps not sure what phrase i should search. Any help would be appreciated. It's not clear what you want. Are you talking about Python code in an HTTP client or an HTTP server? -- Grant Edwards grant.b.edwards Yow! ... I have read the at INSTRUCTIONS ... gmail.com -- http://mail.python.org/mailman/listinfo/python-list -- Bradley J. Hintze Graduate Student Duke University School of Medicine 801-712-8799 -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
On 17 jun, 21:11, Bradley Hintze bradle...@aggiemail.usu.edu wrote: Hi, I am a newbie to anything web related, I know a bit of HTML though. I've been programing in python for a year or so so I know the language at an intermediate level. I am wondering if its possible to get info from an HTML form and pass it to my python code and return a page based on the code executed. All of my web searches have been fruitless as I quickly get lost in the jargon and perhaps not sure what phrase i should search. Any help would be appreciated. Thank you, Bradley Hi Bradley, If I understand correctly, you want to do the following: 1. Fill in a HTML form in a client (web browser) 2. Send the form to a webserver 3. Have the webserver extract the information from the form 4. Send the information to a python program for processing 5. Generate a new HTML page in python based on the information in step 4 6. Send the newly generated page back to the client Possible solutions depend a little on the constraints and/or options you have for the webserver. If you are free in your choices I would suggest to start with cherrypy (www.cherrypy.org) for a webserver. It is simple to start with, very powerfull and well documented. This would cover steps 3 and 4. For step 5 I suggest you either use the python builtin string template facility string.Template (for simple things). If you want more power have a look at Genshi http://genshi.edgewall.org. The two options I mention above help you to understand whats going on. If you feel comfortable with this, you can take a look at python web frameworks like Django or Turbogears (or many others). Good luck and keep us posted with what your progress. Regards, Marco -- http://mail.python.org/mailman/listinfo/python-list
Re: List of lists surprising behaviour
candide cand...@free.invalid writes: Let's the following code : t=[[0]*2]*3 t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [1, 0], [1, 0]] Rather surprising, isn't it ? Not at all, actually. I'd be surprised if the multiplication operator was aware of object constructors. Even arrays are objects in Python. Should the multiplication operator know how to instantiate three arrays from a single array instance? What about an instance of a user-defined class? So I suppose all the subarrays reférence the same array : id(t[0]), id(t[1]), id(t[2]) (3077445996L, 3077445996L, 3077445996L) As they should. So what is the right way to initialize to 0 a 2D array ? Is that way correct : t=[[0 for _ in range(2)] for _ in range(3)] It seems there is no more trouble now : t [[0, 0], [0, 0], [0, 0]] t[0][0]=1 t [[1, 0], [0, 0], [0, 0]] Correct ? 2d_zero_vector = lambda len: [[0, 0] for _ in range(len)] t = 2d_zero_vector(3) print t [[0, 0], [0, 0], [0, 0]] t[0][0] = 1 print t [[1, 0], [0, 0], [0, 0], [0, 0]] (Of course, if you're doing matrix math you'll probably want to work with numpy which has a function for doing just this) -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
On 2010-06-17, Stephen Hansen me+list/pyt...@ixokai.io wrote: BIT_1 = 1 0 BIT_2 = 1 1 ... Basically, those BIT_X lines are creating numbers which have *only* the specified bit set. Then you do byte BIT_X, and that will return 0 if the byte doesn't have the specified bit in it. You can then set the bit with byte | BIT_X, and unset the bit with byte ^ BIT_X. Just to clarify, byte ^ BIT_X inverts (toggles) bit X. If you want to make sure bit X is a 0 (which is what people usually mean by unset), you do byte ~BIT_X -- Grant Edwards grant.b.edwardsYow! I know things about at TROY DONAHUE that can't gmail.comeven be PRINTED!! -- http://mail.python.org/mailman/listinfo/python-list
Python distributing localization files
Hi, I want to localize my application (a pygtk gui app), what's the best way to distribute and install localization files? I'm currently using `distribute` to package it. Any suggestion? -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
On 2010-06-17, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I apologize in advance for my lack of knowledge, I really do not know. I would guess server but I quite honestly I am not clear what an 'HTTP client' or 'HTTP server' refers to. I am running a webpage and am serving it locally for the moment. I have a program that is already written in Python. I want to make the program available on the web where I receive user input from HTML forms. The user input will then be used as parameters for the program. I hope this clear things up. Something that serves a web page is an HTTP server, so it sounds like your program is going to be run by/in the HTTP server. There are many, many different ways to do that. For starters you need to tell us what OS you're using and what HTTP server you're using. Or do you want your program to _be_ an HTTP server? -- Grant Edwards grant.b.edwardsYow! I'm having fun at HITCHHIKING to CINCINNATI gmail.comor FAR ROCKAWAY!! -- http://mail.python.org/mailman/listinfo/python-list
Re: The inverse of .join
On 6/17/10 3:03 PM, Neil Cerutti wrote: On 2010-06-17, Robert Kernrobert.k...@gmail.com wrote: On 6/17/10 2:08 PM, Neil Cerutti wrote: On 2010-06-17, Ian Kellyian.g.ke...@gmail.com wrote: On Thu, Jun 17, 2010 at 11:45 AM, Neil Cerutti ne...@norwich.edu wrote: What's the best way to do the inverse operation of the .join function? Use the str.split method? split is perfect except for what happens with an empty string. Why don't you try it and find out? I would like to apologize. I read that sentence as a question for some reason. That said, it always helps for you to show the results that you are getting (and the code that gives those results) and state what results you were expecting. -- 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
Op donderdag 17-06-2010 om 13:01 uur [tijdzone -0700], schreef Stephen Hansen: On 6/17/10 12:13 PM, Laurent Verweijen wrote: How do I make sure the inputstream stays open after the first call to communicate? This was just asked a few days ago in different words-- check out the thread, a couple solutions are offered. In short, you need to make stdin/stdout non-blocking: http://groups.google.com/group/comp.lang.python/browse_thread/thread/066de1c0fd38642f# I tried putting what Ian Kelly said in my code, by it doesn't work for me. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. import os import fcntl import subprocess process = subprocess.Popen([python, increment.py], stdin = subprocess.PIPE, stdout = subprocess.PIPE) flags = fcntl.fcntl(process.stdout, fcntl.F_GETFL) fcntl.fcntl(process.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK) 0 process.stdin.write(5\n) process.stdout.read() Traceback (most recent call last): File stdin, line 1, in module IOError: [Errno 11] Resource temporarily unavailable -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
On 6/17/10 1:42 PM, Laurent Verweijen wrote: I tried putting what Ian Kelly said in my code, by it doesn't work for me. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. import os import fcntl import subprocess process = subprocess.Popen([python, increment.py], stdin = subprocess.PIPE, stdout = subprocess.PIPE) flags = fcntl.fcntl(process.stdout, fcntl.F_GETFL) fcntl.fcntl(process.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK) 0 process.stdin.write(5\n) process.stdout.read() Traceback (most recent call last): File stdin, line 1, in module IOError: [Errno 11] Resource temporarily unavailable I *believe* that error in response to read() is something you should catch: its EAGAIN. Meaning, for it to perform that operation, it would have to block, but you've set it to not block. Thus, your subprocess hasn't written anything new out yet by the time you call that. You have to try/except looking for that and catch it. That's why I preferred the recipe I linked to in that thread: it uses select to only read when there's something -to- actually read. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
Op donderdag 17-06-2010 om 13:48 uur [tijdzone -0700], schreef Stephen Hansen: On 6/17/10 1:42 PM, Laurent Verweijen wrote: I tried putting what Ian Kelly said in my code, by it doesn't work for me. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. import os import fcntl import subprocess process = subprocess.Popen([python, increment.py], stdin = subprocess.PIPE, stdout = subprocess.PIPE) flags = fcntl.fcntl(process.stdout, fcntl.F_GETFL) fcntl.fcntl(process.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK) 0 process.stdin.write(5\n) process.stdout.read() Traceback (most recent call last): File stdin, line 1, in module IOError: [Errno 11] Resource temporarily unavailable I *believe* that error in response to read() is something you should catch: its EAGAIN. Meaning, for it to perform that operation, it would have to block, but you've set it to not block. Thus, your subprocess hasn't written anything new out yet by the time you call that. You have to try/except looking for that and catch it. That's why I preferred the recipe I linked to in that thread: it uses select to only read when there's something -to- actually read. It just gives me an empty string. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) send_all(p, 5\n) recv_some(p) '' send_all(p, 6\n) recv_some(p) '' -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
I am on Mac OSX 10.6, server is apache. If I do get this working we will move it to the main server which also serves apache, i believe.I dont think I want a whole new server, I'd like to serve from the apache framework if possible. On Thu, Jun 17, 2010 at 4:34 PM, Grant Edwards inva...@invalid.invalid wrote: On 2010-06-17, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I apologize in advance for my lack of knowledge, I really do not know. I would guess server but I quite honestly I am not clear what an 'HTTP client' or 'HTTP server' refers to. I am running a webpage and am serving it locally for the moment. I have a program that is already written in Python. I want to make the program available on the web where I receive user input from HTML forms. The user input will then be used as parameters for the program. I hope this clear things up. Something that serves a web page is an HTTP server, so it sounds like your program is going to be run by/in the HTTP server. There are many, many different ways to do that. For starters you need to tell us what OS you're using and what HTTP server you're using. Or do you want your program to _be_ an HTTP server? -- Grant Edwards grant.b.edwards Yow! I'm having fun at HITCHHIKING to CINCINNATI gmail.com or FAR ROCKAWAY!! -- http://mail.python.org/mailman/listinfo/python-list -- Bradley J. Hintze Graduate Student Duke University School of Medicine 801-712-8799 -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
On Thu, Jun 17, 2010 at 1:15 PM, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I apologize in advance for my lack of knowledge, I really do not know. I would guess server but I quite honestly I am not clear what an 'HTTP client' or 'HTTP server' refers to. I am running a webpage and am serving it locally for the moment. I have a program that is already written in Python. I want to make the program available on the web where I receive user input from HTML forms. The user input will then be used as parameters for the program. I hope this clear things up. Thanks, Bradley HTTP Client = web browser. HTTP Server = the server, You'll probably want to use a framework like Django to help you with this- this is exactly what they were designed to do. What the frameworks do is let you map URLs to functions. Your form data will get sent to the server in a POST request, and the framework will hand that to your function as arguments. Then, your function will generate the web page (often using a template where you just fill in the blanks) and send that back to the browser. -- http://mail.python.org/mailman/listinfo/python-list
Re: Py_single_input and the side-effects...
On 05/06/2010 11:11, Gabriel Genellina wrote: On 31 mayo, 08:11, moerchendiser2k3googler. 1.webmas...@spamgourmet.com wrote: you are right, Python still holds the last reference. I just set a dummy and thats it :) Can you tell me where did you get the information from? Do you mean the _ variable? It's in the tutorial: http://docs.python.org/tutorial/introduction.html#using-python-as-a-calculator -- Gabriel Genellina I have always believed that the _ variable is only available interactively because of this comment in the tutorial:- In interactive mode, the last printed expression is assigned to the variable _. This means that when you are using Python as a desk calculator, it is somewhat easier to continue calculations, for example: ... However a thread from IIRC a couple of days back used _ to say I'm not interested in you, I'm throwing you away in a list comprehension or whatever. I've tried this in a script this evening and it works perfectly. print 'total', sum(amount for _, amount in outputs) Where is the use of _ in a script documented, I've searched all over and can't find it, guess I don't have the Midas touch with google? :) Kindest regards. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
On 6/17/10 2:09 PM, Laurent Verweijen wrote: It just gives me an empty string. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) send_all(p, 5\n) recv_some(p) '' send_all(p, 6\n) recv_some(p) '' Yes, that's how it signals the same situation. The point is: your subprocess isn't outputting anything. You sure its not crashing out, for instance? -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
Op donderdag 17-06-2010 om 23:09 uur [tijdzone +0200], schreef Laurent Verweijen: Op donderdag 17-06-2010 om 13:48 uur [tijdzone -0700], schreef Stephen Hansen: On 6/17/10 1:42 PM, Laurent Verweijen wrote: I tried putting what Ian Kelly said in my code, by it doesn't work for me. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. import os import fcntl import subprocess process = subprocess.Popen([python, increment.py], stdin = subprocess.PIPE, stdout = subprocess.PIPE) flags = fcntl.fcntl(process.stdout, fcntl.F_GETFL) fcntl.fcntl(process.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK) 0 process.stdin.write(5\n) process.stdout.read() Traceback (most recent call last): File stdin, line 1, in module IOError: [Errno 11] Resource temporarily unavailable I *believe* that error in response to read() is something you should catch: its EAGAIN. Meaning, for it to perform that operation, it would have to block, but you've set it to not block. Thus, your subprocess hasn't written anything new out yet by the time you call that. You have to try/except looking for that and catch it. That's why I preferred the recipe I linked to in that thread: it uses select to only read when there's something -to- actually read. It just gives me an empty string. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) send_all(p, 5\n) recv_some(p) '' send_all(p, 6\n) recv_some(p) '' I also tried running the module as a program: from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) for n in [5, 7, 10, 4]: send_all(str(p), n) print(recv_some(p)) It gives: prompt:~$ python subchronous_test.py Traceback (most recent call last): File subchronous_test.py, line 5, in module send_all(str(p), n) File /home/Somelauw/asynchronous.py, line 145, in send_all while len(data): TypeError: object of type 'int' has no len() prompt:~$ Traceback (most recent call last): File increment.py, line 4, in module n = int(raw_input(n)) + 1 EOFError: EOF when reading a line close failed in file object destructor: Error in sys.excepthook: Original exception was: By the way: synchronous is the name I gave to your module -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get bit info
On 6/17/10 1:29 PM, Grant Edwards wrote: On 2010-06-17, Stephen Hansen me+list/pyt...@ixokai.io wrote: BIT_1 = 1 0 BIT_2 = 1 1 ... Basically, those BIT_X lines are creating numbers which have *only* the specified bit set. Then you do byte BIT_X, and that will return 0 if the byte doesn't have the specified bit in it. You can then set the bit with byte | BIT_X, and unset the bit with byte ^ BIT_X. Just to clarify, byte ^ BIT_X inverts (toggles) bit X. If you want to make sure bit X is a 0 (which is what people usually mean by unset), you do byte ~BIT_X Doh, you're correct. I got so used to the pattern of only ever flipping the bit off after for some reason I knew it was on, like: if blah CONSTANT_A: do-stuff blah = blah ^ CONSTANT_A That I forgot ^ was invert _ Ahem! Thanks for the correction. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
Op donderdag 17-06-2010 om 14:36 uur [tijdzone -0700], schreef Stephen Hansen: On 6/17/10 2:09 PM, Laurent Verweijen wrote: It just gives me an empty string. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) send_all(p, 5\n) recv_some(p) '' send_all(p, 6\n) recv_some(p) '' Yes, that's how it signals the same situation. The point is: your subprocess isn't outputting anything. You sure its not crashing out, for instance? No, since it responds to the keyboard: prompt:~$ python increment.py 05 64 53 44 55 66 75 64 53 44 55 66 7 All output is correct. -- http://mail.python.org/mailman/listinfo/python-list
How to print SRE_Pattern (regexp object) text for debugging purposes?
I need to print the regexp pattern text (SRE_Pattern object ) for
debugging purposes, is there any way to do it gracefully? I've came up
with the following hack, but it is rather crude... Is there an
official way to get the regexp pattern text?
import re, pickle
r = re.compile('^abc$', re.I)
r
_sre.SRE_Pattern object at 0xb7e6a330
ds = pickle.dumps(r)
ds
cre\n_compile\np0\n(S'^abc$'\np1\nI2\ntp2\nRp3\n.
re.search(\n\(S'(.*)'\n, ds).group(1)
'^abc$'
-- Cheers, Dmitry
--
http://mail.python.org/mailman/listinfo/python-list
Re: Running a program from another program.
On 6/17/10 2:40 PM, Laurent Verweijen wrote: Op donderdag 17-06-2010 om 14:36 uur [tijdzone -0700], schreef Stephen Hansen: On 6/17/10 2:09 PM, Laurent Verweijen wrote: It just gives me an empty string. Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3] on linux2 Type help, copyright, credits or license for more information. from asynchronous import * p = Popen([python, increment.py], stdin=PIPE, stdout=PIPE) send_all(p, 5\n) recv_some(p) '' send_all(p, 6\n) recv_some(p) '' Yes, that's how it signals the same situation. The point is: your subprocess isn't outputting anything. You sure its not crashing out, for instance? No, since it responds to the keyboard: That doesn't really prove the point. There's all kinds of things that can go wrong when you switch how you run a program. Wrap your increment.py in like: import sys import traceback try: ... except: print sys.stderr, traceback.format_exc() Then add the arg in your Popen, stderr=sys.stderr And see if any exception is thrown. The original error you got, and the empty string from the recipe, both mean interpret.py is not returning any output. Why? Maybe its erroring out-- the subprocess context is different then the context of running a program from the keyboard. Or maybe you're not sending: In your other thread you include an actual traceback: Traceback (most recent call last): File subchronous_test.py, line 5, in module send_all(str(p), n) File /home/Somelauw/asynchronous.py, line 145, in send_all while len(data): TypeError: object of type 'int' has no len() The first argumetn to send_all should be the actual Popen subclass. The second should be a string to send. I think that line really is intended to be: send_all(p, str(n)) # assuming 'n' is say, the number 5. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Processing HTML form
On 2010-06-17, Bradley Hintze bradle...@aggiemail.usu.edu wrote: I am on Mac OSX 10.6, server is apache. If I do get this working we will move it to the main server which also serves apache, i believe.I dont think I want a whole new server, I'd like to serve from the apache framework if possible. There are a couple different ways to integrate python code into apache. You can use the normal CGI API where apache runs external programs written in Python: http://docs.python.org/library/cgi.html http://gnosis.cx/publish/programming/feature_5min_python.html http://www.cs.virginia.edu/~lab2q/lesson_1/ http://www.upriss.org.uk/python/PythonCourse.html Or you can embed Python into apache so that it's faster and you can do some more sophisticated stuff that's above my head: http://www.modpython.org/ http://onlamp.com/pub/a/apache/2003/04/10/apacheandpython.html More on both of the above at http://www.google.com/search?q=apache+python There are people on the list far more experienced with Python+Apache than I, so I'll leave it at that. -- Grant Edwards grant.b.edwardsYow! ... he dominates the at DECADENT SUBWAY SCENE. gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Py_single_input and the side-effects...
On 6/17/10 2:32 PM, Mark Lawrence wrote: Where is the use of _ in a script documented, I've searched all over and can't find it, guess I don't have the Midas touch with google? :) Its purely a convention, and one that crosses language-bounds, and isn't entirely universal even given that. It just means 'placeholder that I care naught for'; its not a feature, there's no code or any /ability/ to use it. Its the same as any other variable name. It just happens to be a name that conveys no meaning while being short and visually distinct: except to say you don't care about what value ends up there, consider it thrown away. That the interactive interpreter happens to store the last value in a variable of the same name doesn't really mean anything. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
