Re: OOP & Abstract Classes

;", line 5, in getMeasurement NotImplementedError >>> base.setPressure(14) Traceback (most recent call last): File "", line 1, in File "", line 7, in setPressure NotImplementedError >>> >>> real = RealDevice("/dev/ttyS1") >>> real RealDevice('/dev/ttyS1') >>> real.getMeasurement() 0 >>> real.setPressure(14) >>> real.getMeasurement() 14 >>> -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: issue with twisted and reactor. Can't stop reactor

callbacks or deferred objects). To get your program to do something immediately after it is started, use reactor.callLater() before calling reactor.run(). You can't mix and match programming styles with twisted - it is all asynchronous callbacks or nothing in my experience! That takes a bit of

Re: itertools question

if not out: break yield out g = Grouper(5, xrange(20)) print list(g) g = Grouper(4, xrange(19)) print list(g) Which produces [(0, 1, 2, 3, 4), (5, 6, 7, 8, 9), (10, 11, 12, 13, 14), (15, 16, 17, 18, 19)] [(0, 1, 2, 3), (4, 5, 6, 7), (8, 9, 10, 11), (12, 13, 14, 15), (16, 17,

Re: Need advice on distributing small module

plejson as json Is more pythonic... You aren't relying on what came with particular python versions which may not be true in jython/ironpython/etc. -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Options for creating a statistics screen on a Mac with Python?

be even a bit > easier. I'd use pygame for a really clean full screen display. Probably a bit more work, but you'll get something really cool at the end of it! here is how to use matplotlib on a pygame surface http://www.pygame.org/wiki/MatplotlibPygame -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Adding a Par construct to Python?

=10**6 because I got bored of waiting ;-) map 9.85280895233 pmap 28.4256689548 So the pmap took nearly 3 times as long. I expect this is because the task was divided into 5 sections each competing madly for the GIL. I ran the same script under the latest jython beta which was very interesting! pmap showing a slight improvement, and faster than cPython! $ jython2.5rc2/jython pmap.py map 6.242000103 pmap 5.8881144 -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: How to Spawn a process with P_NOWAIT and pass it some data ?

nder.py\n' (printed with a 1 second pause between each line) ---- If you want to interact with a subprocess (eg send, receive, send, receive) then use the pexpect module - buffering in subprocess will cause you nothing but pain otherwise! > (Or, is there a way to create a subprocess.Popen object from what I assume = > is the process handle integer ?) Errr, not as far as I know. -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Ah, ctypes

uld potentially note that function types don't have enough references to them when passed in as arguments to C functions? It might slow it down microscopically but it would fix this problem. -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Ah, ctypes

David Bolen wrote: > Nick Craig-Wood writes: > > > ctypes could potentially note that function types don't have enough > > references to them when passed in as arguments to C functions? It > > might slow it down microscopically but it would fix this problem. &

Re: Using C++ and ctypes together: a vast conspiracy? ;)

ointers etc. If you want to dig into virtual classes with multiple bases or the STL then you are probably into the territory you describe. That said I've used C++ with ctypes loads of times, but I always wrap the exported stuff in extern "C" { } blocks. -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: easiest way to plot x,y graphically during run-time?

radius -= 1 screen.fill(background_colour) for dot in dots: pygame.draw.circle(screen, foreground_colour, dot, radius, 1) dots = [ (dot[0]+randrange(-1,2), dot[1]+randrange(-1,2)) for dot in dots ] pygame.display.flip() if __name__ == "__main__"

Re: Get the hard disk hardware serial number

Enabled According to the man page smartctl also runs under windows/mac/solaris etc -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: What text editor is everyone using for Python

, press Ctrl-C Ctrl-C and have the output shown in a different window. If you messed up, clicking on the error will put the cursor in the right place in the code). -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: What text editor is everyone using for Python

Ben Finney wrote: > Emile van Sebille writes: > > > On 6/4/2009 3:19 PM Lawrence D'Oliveiro said... > > > In message , Nick Craig- > > > Wood wrote: > > > > > >> You quit emacs with Ctrl-X Ctrl-C. > > > > > > That'

Re: unladen swallow: python and llvm

m concerned is that it is more of a port of CPython to a new architecture than a complete re-invention of python (like PyPy / IronPython / jython) so stands a chance of being merged back into CPython. -- Nick Craig-Wood -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: sys.excepthack...

error_text = "".join(format_exception(type, value, traceback)) wx.MessageDialog(None, error_text, 'Custom Error:', wx.OK).ShowModal() def OnClick(self, evt): "Click with a deliberate mistake" adsfsfsdf if __name__ == "__main__": a

Re: TPCServer and xdrlib

rd with xmlrpc. > > I have looked at various solutions including: > > - PyOrbit - too heavy weight > - Pyro - uses pickle, I do not trust it It is possible to change the serialization used by Pyro http://pyro.sourceforge.net/manual/9-security.html#pickle to the the 'g

Re: Get all the instances of one class

est.instances() Which prints [] [<__main__.Test object at 0xb7d4eb6c>, <__main__.Test object at 0xb7d4eb4c>] [<__main__.Test object at 0xb7d4eb6c>] [] -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: TPCServer and xdrlib

hon with a bit of searching. Also I believe twisted supports them directly or you could easily roll your own. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: scaling problems

do more of those!" - as a battle scarred C programmer I'd agree ;-) -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Write bits in file

be stored at an arbitrary > > bit-position in the file > > Yes. I need arbitrary, 8bits, than 10 bits for something else, than > sequence of bytes, than 10 bits again, etc. You could try http://construct.wikispaces.com/ which could well do exactly what you want. -- Nick Cr

Re: php vs python

drummed into me to always use parameters for user input and I was really suprised PHP didn't have them. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Python and Flaming Thunder

8. 8 2> X = 10. ** exception error: no match of right hand side value 10 3> That error message is the erlang interpreter saying "Hey I know X is 8, and you've said it is 10 - that can't be right", which is pretty much what math teachers say too... -- Nick Craig-Wood <[EM

Re: Python and Flaming Thunder

Mel <[EMAIL PROTECTED]> wrote: > Mensanator wrote: > > On May 22, 10:30??am, Nick Craig-Wood <[EMAIL PROTECTED]> wrote: > >> Dave Parker <[EMAIL PROTECTED]> wrote: > >> > But after getting input from children and teachers, etc, it started > &g

Re: Python and Flaming Thunder

L). I think candygram is crying out to be married with stackless &or PyPy. It also needs an IPC channel to compete with Erlang directly. If you are interested in stackless python vs Erlang then take a look at this... http://muharem.wordpress.com/2007/07/31/erlang-vs-stackless-python-a-first-

Re: Calling class method by name passed in variable

nt call last): File "", line 1, in TypeError: 'int' object is not callable >>> getattr(obj, 'f')(1) False >>> -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: call f(a, *b) with f(*a, **b) ?

y manipulation)... So instead of f(a, *args) have f(a, list_of_args). The f(*args) syntax is tempting to use for a function which takes a variable number of arguments, but I usually find myself re-writing it to take a list because of exactly these sort of problems. In fact I'd be as bold to

Re: ctypes help

4] OSCL_getCurrentStaticParams [ 5] OSCL_getErrorString [ 6] OSCL_getIdent [snip] This is a dll we used in a project, and those names exactly worked with ctypes, eg some snips from the ctypes code self.dll = cdll.LoadLibrary("OurSharedCodeLibrary") self.dll.OSCL_getErrorString.restype = c_char_p def getErrorString(self, status): return self.dll.OSCL_getErrorString(c_int(status)) -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Why is math.pi slightly wrong?

de("hex") '400921fb54442d18' >>> struct.unpack(">d", "400921FB54442D18".decode("hex")) (3.1415926535897931,) >>> struct.unpack(">d", "400921FB54442D19".decode("hex")) (3.1415926535897936,) >>> -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Calling class method by name passed in variable

Bruno Desthuilliers <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood a ?crit : > > Bruno Desthuilliers <[EMAIL PROTECTED]> wrote: > >>> Can someone suggest an efficient way of calling method whose name is > >>> passed in a variable? > >>>

Re: Advice from senior Members

t is hard to write tests for wx GUIs though (but not impossible). When you've finished you'll have 3 files full of classes. You may have a few utility functions too. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: array of 64-bit ints?

this... from ctypes import * Array = c_int64 * 100 a = Array() for i in range(100): a[i] = 2**63 - i for i in range(100): print a[i] prints -9223372036854775808 9223372036854775807 9223372036854775806 [snip] 9223372036854775710 9223372036854775709 ctypes arrays are fixed len

Re: ctypes, function pointers and a lot of trouble

an "Invalid Parameter" errorcode. there's also no useful > data whereas datainfo gets written correctly. I know that my cdStream > can't work, facing the C-code, but what'd be the right cdStream class? > What can I do? Any ideas? I've noted some obvious problems above. To get this to work will require some C knowledge. If they supply some example C code I'd work through that translating it line by line to python+ctypes. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: ctypes, function pointers and a lot of trouble

uint), ("open", cstreamopen), ("close", cstreamclose), # etc... This will involve you re-ordering your definitions. Or alternatively, you could cast the function pointer to a c_void_p first, eg data.u.pStream.open = c_void_p( c

Re: ctypes, function pointers and a lot of trouble

call last): File "", line 1, in TypeError: expected LP_c_char instance, got _ctypes.PointerType >>> databuftype = c_char * 10 >>> databuf = databuftype() >>> cbuffer.cpBuffer = databuf >>> databuf <__main__.c_char_Array_10 o

Re: ctypes, function pointers and a lot of trouble

> dwCreationDisposition, > FILE_ATTRIBUTE_NORMAL, > NULL ); use os.read os.write and os.open which will give you OS handles rather than python file objects, ie I think these are a fairly direct interface to CreatFile etc

Re: How to perform a nonblocking read from a process

L or Expect nor does it require C extensions to be compiled. It should work on any platform that supports the standard Python pty module. The Pexpect interface was designed to be easy to use. You'll never get it to work with subprocess like this because of the buffering. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: How to kill a thread?

com/ASPN/Cookbook/Python/Recipe/496960 and http://sebulba.wikispaces.com/recipe+thread2 Read the caveats! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: time.clock() or Windows bug?

ion layer (HAL). To specify processor affinity for a thread, use the SetThreadAffinityMask function. I would have said time.time is what you want to use anyway though because under unix time.clock() returns the elapsed CPU time which is not what you want at all! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: time.clock() or Windows bug?

Tim Roberts <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood <[EMAIL PROTECTED]> wrote: > > > >time.clock() uses QueryPerformanceCounter under windows. There are > >some known problems with that (eg with Dual core AMD processors). > > > >See http://m

Re: time.clock() or Windows bug?

Theo v. Werkhoven <[EMAIL PROTECTED]> wrote: > The carbonbased lifeform Nick Craig-Wood inspired comp.lang.python with: > > Theo v. Werkhoven <[EMAIL PROTECTED]> wrote: > >> Output: > >> Sample 1, at 0.0 seconds from start; Output power is: 8.967 dBm >

Re: Web Crawler - Python or Perl?

but once you do you'll be writing a killer crawler ;-) As for Perl - once upon a time I would have done this with perl, but I wouldn't go back now! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: _POSIX_C_SOURCE

SOURCE" > redefined > > but if i do > > export C_INCLUDE_PATH=/usr/include/python2.4 > > I do not face any compilation issues. > > I would like to know if there is anything i am missing on this. Do it in your code with #define _POSIX_C_SOURCE instead of the Makefile

Re: mysql to sqlite

which was from MSSQL->MySQL). You'll find that different databases have subtly different ways of doing things (eg autoincrement fields on mysql) so you'll most likely need a custom script anyway. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Alternative to Decimal type

.mpq(123,1000) >>> b = gmpy.mpq(12,100) >>> a+b mpq(243,1000) >>> a*b mpq(369,25000) >>> a/b mpq(41,40) >>> It is also *very* fast being written in C. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: get keys with the same values

'e'] > 2 : ['c'] > 3 : ['b', 'd'] > 4 : ['f'] > Or use the little understood dict.setdefault method which has been with us from time immemorial... >>> d = {'a' : 1, 'b' : 3, 'c' : 2,'d' : 3,'e' : 1,'f' : 4} >>> dd = {} >>> for k, v in d.items(): ... dd.setdefault(v, []).append(k) ... >>> dd {1: ['a', 'e'], 2: ['c'], 3: ['b', 'd'], 4: ['f']} >>> -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: sorted or .sort() ?

expensive than computer time, > after all. Good advice with one caveat: sorted() was only introduced in python 2.4 so if your code must run on earlier versions then use list.sort() -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: How to catch StopIteration?

numerate(collatz(13)): ... last = x[:i+1] ... print x[:i+1] ... else: ... last.append(1) ... print last ... [13] [13, 40] [13, 40, 20] [13, 40, 20, 10] [13, 40, 20, 10, 5] [13, 40, 20, 10, 5, 16] [13, 40, 20, 10, 5, 16, 8] [13, 40, 20, 10, 5, 16, 8, 4] [13, 40, 20, 10, 5, 16, 8,

Re: how to export functions by name for ctype

vention. I guess you've compiled your DLL with C++ and the above is a C++ mangled name. Either compile it with C, or export the names in an extern "C" { } block. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: flock seems very unsafe, python fcntl bug?

if not os.path.exists('aaa'): fd = open('aaa', 'w+') else: fd = open('aaa', 'r+') fcntl.flock(fd,fcntl.LOCK_EX) fd.truncate() fd.write(data) fd.close() def check(): fd = open('aaa', 'r') fcntl.flock(fd,fcntl.LOCK_EX) data = fd.read() fd.close() if data not in ("sausage", "potato"): raise AssertionError("Wrong data %r" % data) if os.path.exists("aaa"): os.unlink("aaa") if len(sys.argv) < 2: print "Syntax: %s " % sys.argv[0] raise SystemExit(1) method = globals()["method_"+sys.argv[1]] if os.fork(): while 1: method("sausage") check() else: while 1: method("potato") check() -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: MD5 hash for url and utf unicode converting to ascii

t;>> value '\xc9\x11}\x8f?64\x83\xf3\xcaPz\x1d!\xddd' >>> value.encode("hex") 'c9117d8f3f363483f3ca507a1d21dd64' >>> long(value.encode("hex"), 16) 267265642849753964132104960801656397156L >>> > For unicode encoding, I can do, md5.update(value.encode('utf-8')) to > give me ascii values. Yes that would be fine -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: binary representation of an integer

out.append(hex_to_binary[hex_digit]) ... out = "".join(out).lstrip("0") ... if out == "": ... out = "0" ... return out ... >>> to_binary(0) '0' >>> to_binary(10) '1010' >>> to_binary(100) '1100100' >>> to_binary(1000) '101000' >>> to_binary(1000) '1000101011000111001000110100100010001000' But don't try this ;-) >>> to_binary(-1) Traceback (most recent call last): File "", line 1, in File "", line 4, in to_binary KeyError: '-' -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Python 3000 vs Perl 6

) Another VM to run python would be nice of course, but we already have jython, ironpython and pypy. Both jython and ironpython use JIT, pypy can compile to native code and you can use psyco for JIT code also in normal python. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig

Re: calling a .exe from Python

robably what you want is this... from subprocess import call rc = call(["mypath/myfile.exe",arg1,arg2]) rc will contain the exit status See the subprocess module for more things you can do -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: shorten this: if char in "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz":

t creates two lists then joins them then throws the whole lot away! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: calling a .exe from Python

evidentemente.yo <[EMAIL PROTECTED]> wrote: > On 24 jun, 14:32, Nick Craig-Wood <[EMAIL PROTECTED]> wrote: > > Probably what you want is this... > > > > from subprocess import call > > > > rc = call(["mypath/myfile.exe",arg1,arg2])

Re: C++ or Python

add a bit of C/C++ if some part of it was running too slowly. If there were existing C/C++ libraries then I'd use ctypes to interface with them. I don't think I ever want to start another large C++ app - been there, done that, got the (mental) scars to prove it ;-) All my humble opinio

Re: Why is recursion so slow?

e here for a python memoize which makes the recursive algorithm run fast... http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52201 -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Getting sorting order

passing len(x) arguments to zip. So if x = [1,2,3,4] zip(*x) == zip(1,2,3,4) -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Why is recursion so slow?

Rich Harkins <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood wrote: > [snip] > > By definition any function in a functional language will > > always produce the same result if given the same arguments, so you can > > memoize any function. > > > > Ah, s

Re: ctypes - unloading implicitly loaded dlls

ll, but I haven't found any way of doing that. Can anyone offer > my some suggestions? Or, am I S.O.L.? You could try loading C explicitly with ctypes.LoadLibrary() before loading A, then you'll have a handle to unload it before you load B. I think I'd probably split the c

Re: ActiveState Code (the new Python Cookbook) has been launched

n the old site! Mind telling us how it is implemented? I'm guessing python/django by the url and the fact that you have python stuff on your home pages but I could be wrong! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Interconvert a ctypes.Structure to/from a binary string?

a.x 0 >>> memmove(addressof(a), packet, sizeof(a)) 3083811008L >>> a.x 258 I think the second of those methods is promoted by the ctypes documentation. I'm not sure about the lifetimes of the .contents in the first method! And the reverse >>>

Re: Problem with global variables

--- class Test(object): def __init__(self): self.foo = [] def goo(self): self.foo.append(2) def moo(self): print self.foo test = Test() >>> from test2 import test >>> test.foo [] >>> test.goo() >>> test.foo [2] >>> test.moo() [2] >>> -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: A Question about ctypes and a function f(void **)

c_char_p(136692916) >>> s.value 'hello' >>> or use ctypes.memmove to copy the data out to somewhere else. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: export sites/pages to PDF

to script that with python. See here for some more info on dcop :- http://www.ibm.com/developerworks/linux/library/l-dcop/ -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: bsddb3 thread problem

I spent weeks trying to get it to behave when threading. I gave up in the end and changed to sqlite :-( At least if you make a mistake with sqlite and use the wrong handle in the wrong place when threading it gives you a very clear error. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://ww

Re: Homework help

function howMany(item,lst) which accepts > an item and a lst of items and returns the number of times item occurs > in lst. For example, howMany(3,[1,2,3,2,3]) should return 2. Read section 4.1, 4.2 and 4.6 from here http://docs.python.org/tut/node6.html -- Nick Craig-Wood <[EMAIL

Re: bsddb3 thread problem

ying to use it in thread Y which won't work". You can probably make bsddb work with threads, but I wasted too much time trying without success! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: is file open in system ? - other than lsof

if not os.path.exists(link): continue open_files.setdefault(link, []).append(pid) for link in sorted(open_files.keys()): print "%s : %s" % (link, ", ".join(map(str, open_files[link]))) You m

Re: I just killed GIL!!!

dict unshareable, while immutable int and str objects can still be shared. Further, mutable objects that provide an explicit API for use between threads are also shareable. ---- -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: [Python 2.4/2.5] subprocess module is sorely deficient?

if killpg: os.killpg(pgid, signal.SIGKILL) else: os.kill(pid, signal.SIGKILL) except OSError: return -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: [Python 2.4/2.5] subprocess module is sorely deficient?

Mark Wooding <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood <[EMAIL PROTECTED]> wrote: > > Harishankar <[EMAIL PROTECTED]> wrote: > >> 1. Create non-blocking pipes which can be read in a separate thread > >> [...] > > > > You are correct o

Re: subprocess module is sorely deficient?

uses pexpect fairly extensively to > interface with all sorts of other systems. We recently received > funding from Microsoft to do a native port of Sage (and all of its > components to Windows. Part of this will most likely be a port of > pexpect to Windows. Hooray! -- Nick Craig-Wood &

Re: function that accepts any amount of arguments?

return v/len(x) > >> > > > > think you want total/len(x) in return statement > > > Yes indeed, how glad I am I wrote "untested". I clearly wasn't pair > programming when I wrote this post ;-) Posting to comp.lang.python is pair programming wit

Re: Little novice program written in Python

learning the > language idioms). When you are up to speed in python I suggest you check out gmpy for number theory algorithms. Eg :- import gmpy p = 2 while 1: print p p = gmpy.next_prime(p) -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.co

Re: Question regarding Queue object

o be put in and all the threads will have to do is Queue.get() and be sure they've got a message they can deal with. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Receive data from socket stream

new = client.recv(256) if not new: break data += new >From the man page for recv RETURN VALUE These calls return the number of bytes received, or -1 if an error occurred. The return value will be 0 when the peer has performed an orderly shutd

Re: Receive data from socket stream

impossible to tell how much data has been sent. There should really be a recvall for symmetry, but I don't think it would get much use! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Regular Expression - Matching Multiples of 3 Characters exactly.

7;, 'AUG', 'WWQWAWQWW', 'QWW', 'AGG') >>> > This way, I could scan for genes, remove the first letter, scan for > more genes, remove the first letter again, and scan for more genes. > This would hypothetically yield different genes, since the frame > would be shifted. Of you could just unconstrain the first match and it will do them all at once :- (AUG)((\w\w\w)*?)(AGG) You could run this with re.findall, but beware that this will only return non-overlapping matches which may not be what you want. I'm not sure re's are the best tool for the job, but they should give you a quick idea of what the answers might be. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Receive data from socket stream

Hrvoje Niksic <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood <[EMAIL PROTECTED]> writes: > > > What you are missing is that if the recv ever returns no bytes at all > > then the other end has closed the connection. So something like this > > is the corr

Re: Question regarding Queue object

Terry <[EMAIL PROTECTED]> wrote: > On Apr 28, 5:30 pm, Nick Craig-Wood <[EMAIL PROTECTED]> wrote: > > David <[EMAIL PROTECTED]> wrote: > > > Another idea would be to have multiple queues, one per thread or per > > > message type "group

Re: Receive data from socket stream

lf.sock = None raise ServerDisconnectedException() self.rx_buf += rx return message Sorry I mis-understood your original post! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Receive data from socket stream

Hrvoje Niksic <[EMAIL PROTECTED]> wrote: > Nick Craig-Wood <[EMAIL PROTECTED]> writes: > > >> Note that appending to a string is almost never a good idea, since it > >> can result in quadratic allocation. > > > > My aim was clear exposition

Re: Best way to store config or preferences in a multi-platform way.

= os.path.join(self.home, "."+self.NAME) if not os.path.isdir(self.config_dir): os.makedirs(self.config_dir, mode=0700) self.config_file = os.path.join(self.config_dir, "config") -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: portable fork+exec/spawn

eceive output, read exit code type jobs. For jobs which require interactivity ie send input, receive output, send input, receive output, ... it doesn't work well. There isn't a good cross platform solution for this yet. pyexpect works well under unix and is hopefully being ported to

Re: portable fork+exec/spawn

ues since it's > event-driven. It took me a while but I found the documentation on this eventually http://twistedmatrix.com/documents/current/api/twisted.internet.interfaces.IReactorProcess.html Looks interesting - I'll have to try it next time I'm reaching for pexpect Thanks N

Re: Help with pyserial and sending binary data?

immediately after plugging the port in. I do a lot of this sort of thing at work (not with cars though with satellite equipment) and it is always the first packet and the first response which is the hard part. After that it is usually plain sailing! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Newbie question - probably FAQ (but not exactly answered by regular FAQ)

er idea ? Suggestions with > reasoning would be very helpful. Jython seems to be based off python 2.2 so you would be limited to 2.2 features in that case. No big deal in my opinion. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Feature suggestion: sum() ought to use a compensated summation algorithm

y! > I thought that it would be very nice if the built-in sum() function used > this algorithm by default. Has this been brought up before? Would this > have any disadvantages (apart from a slight performance impact, but > Python is a high-level language anyway ...)? sum() gets used for any numerical types not just floats... -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: ISBN Barecode reader in Python?

SDK doing the same? As it is a hobby > project, I don't like to spend money on the SDK. Pick yourself up a cue-cat barcode reader, eg from here or ebay http://www.librarything.com/cuecat These appear as a keyboard and "type" the barcode in to your program. Cheap and eff

Re: get the pid of a process with pexpect

gt; Is there a way to get it using pexpect ? If I understand you correctly what you need to do is run "echo $$" on the remote shell then "exec tunnel_command". The $$ will print the pid and the exec will run tunnel_command without changing the pid. -- Nick Craig-Wood <[EMA

Re: Script using generators produces different results when invoked as a CGI

file size... > Are you sure the script runs to completion? Output a message at the > end, to be sure. Check the ownership of all the files too. Remember that the web server (and hence your cgi) will likely run as nobody or www-data. You are unlikely to be logging in as one of those users. -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Newbie question - probably FAQ (but not exactly answered by regular FAQ)

vailable as a 3rd party module for 2.3 and 2.4. As is sqlite3. So in my opinion the real difference between the 2.2, 2.3, 2.4 and 2.5 are the built in modules. The actual language changes are very minor. If you write your code for 2.5 which is probably a good idea, you'll have no problem ba

Re: Numeric literal syntax (was: Py 2.6 changes)

inimize programming errors, simple code mistakes > too. And perl also *ducks* -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: use str as variable name

27; > a.__argname__= new_value Not quite sure what the above is supposed to achieve > rather than : > > if arg == 'height': >a.height = new_value > elif arg == 'width'; >a.width = new_value > > Can I do this with python ? How ? se

Re: creating an (inefficent) alternating regular expression from a list of options

orting it to python but looking at the regular expressions made me feel weak at the knees ;-) -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: Simple UDP server

#x27;d use select and run asynchronously. http://docs.python.org/lib/module-select.html Actually if I really had to do this I'd use twisted. Right tool for the job! -- Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list

Re: dict slice in python (translating perl to python)

= mydict['two'] v3 = mydict['two'] Either is only a couple more characters to type. It is completely explicit and comprehensible to everyone, in comparison to v1,v2,v3 = [ mydict[k] for k in ['one','two','two']] # 52 chars v1,v2,v3 = [

Re: dict slice in python (translating perl to python)

Steven D'Aprano <[EMAIL PROTECTED]> wrote: > On Thu, 11 Sep 2008 03:36:35 -0500, Nick Craig-Wood wrote: > > > As an ex-perl programmer and having used python for some years now, I'd > > type the explicit > > > > v1,v2,v3 = mydict['one

<    3   4   5   6   7   8   9   >