s/).
And you may also look for soaplib (http://trac.optio.webfactional.com/)
but it is probably also `dead'. There is a fork soaplib-lxml, however,
that is being actively developed.
SOAP is not very popular in the Python world, I think. SOAP is a mammoth
and that fits better in the Java and M
a need for these
threads. You could just use os.wait() to wait for a child to finish and
then start a new process if necessary.
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>>>>> Lie Ryan (LR) wrote:
>LR> Piet van Oostrum wrote:
>>>>>>>> Prasoon (P) wrote:
>>>
>P> What is the difference between
>P> z=int(raw_input()) and z=eval(raw_input())(I thought them to be
>P> the same in case of in
gt; memory management scheme of whatever language one uses. For code written
>CY> for CPython only, as mine is, RAII is an appropriate idiom and not kludgy
>CY> at all. Under your assumptions, its use would be wrong, of course.
I dare to say that, even in CPython it is doomed to dis
the self.q.join() will be processed and the thread
finishes. In the mean time while t.isAlive() is constantly being tested,
also wasting CPU time.
IMHO a better way is to put a sentinel object in the queue:
def run(self):
dbf1 = Dbf('D:\\python\\testdbf\\promet.dbf', re
iles. I don't think
>PB> that advances your case.
And that was a bug apparently (euphemistically called a `problem').
>PB> If they had changed the Windows behaviour, yes, but
>PB> Windows 7 seems to be compatible with NT 3.5 rather
>PB> than with DOS.
If that
'
>VS> - decorator passes this 'whatGroup' argument to my lock which is used in
>acquire logic.
>VS> Is it ok to make such assumptions in decorator?
As long as you make sure that all decorated functions indeed adhere to
that assumption there is nothing wrong wit
>>>>> John Machin (JM) wrote:
>JM> [1] No kidding: http://www.google.com/patents/about?id=QMwnEBAJ
Apart from these patents probably being silly, why don't they just write
the code in Python? :=)
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Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142B
the Python language, but of the Python
implementation. And yes, it will not benefit from more than one core.
You should watch/read this:
http://blip.tv/file/2232410
http://www.dabeaz.com/python/GIL.pdf
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URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email:
on
>>>>> a = 1
>>>>> b = 25
>>>>> a / b
>AL> 0.040001
>>>>>
>AL> In what simple way can I get just 0.04 ?
In addition to the answers others have given:
>>> 0.04
0.040001
>>>
>>>>> Chris Withers (CW) wrote:
>CW> Piet van Oostrum wrote:
>>>>>>>> John Machin (JM) wrote:
>>>
>JM> [1] No kidding: http://www.google.com/patents/about?id=QMwnEBAJ
>>>
>>> Apart from these patents probably
f the Python language, but of the *CPython*
implementation. And yes, it will not benefit from more than one core.
You should watch/read this:
http://blip.tv/file/2232410
http://www.dabeaz.com/python/GIL.pdf
--
Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Privat
t the PID of the process, but I'm not sure
>TR> where to go from there. Is there an easy way to do this?
You could look at the psutil module: http://code.google.com/p/psutil/
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ceptions to be handled.
I also added traceback printout in the outer exception handler and it
points to the sem.acquire line.
My conclusion is that if there are two exceptions at the same time, the
inner exception handler is interrupted by the other exception even
before the except clause can be entered. And only the outer one is
really executed. This explains the behaviour that the OP described.
I think you can only have two exceptions at the same time if at least
one of them is a signal.
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gram is running on could have atomic read/writes
on 64-bit quantities but if you rely upon that your program may no
longer be portable.
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re comes in
handy. Now usually these reads will not consume so much CPU so it will
probably be hardly noticeable. But if you would have some kind of
CPU-intensive User-space File System, for example with compression
and/or encryption and the data is in memory you might notice it. In this
example a
thread is not I/O
bound but CPU bound. See my other posting for an example.
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custom
error you will have to do some other stuff. I don't know what but maybe
calling PyErr_SetString is sufficient as it might overwrite the
KeyboardInterrupt stuff.
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>SD> Class A only gets defined if you run the module as a script. What you need
>SD> is to unconditionally define class A, outside of the if __name__ block:
>SD> class A(BaseA):
>SD> pass
>SD> # A.__base__ = DebugA ## Uncomment this line for debugging.
>>>A.__base__ = DebugA
TypeError: readonly attribute
Make that: A.__bases__ = DebugA,
>SD> --
>SD> Steven
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t sometimes only half of a discussion is visible.
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>>>>> Chris Rebert (CR) wrote:
>CR> On Sun, Jun 21, 2009 at 5:25 AM, Piet van Oostrum wrote:
>>> I notice that I see several postings on news:comp.lang.python that are
>>> replies to other postings that I don't see. Examples are the postings by
>>
mething wrong or this is as designed behavior
>a> .
>a> any help appreciated
Calling unicode(fp, "unicode_escape") with these filenames is nonsense.
unicode_escape is for transforming a string like \u20ac to a €-sign or
vice versa:
>>> fp="\\u20ac"
>>> print unicode(fp,"unicode_escape")
€
So what are you trying to achieve?
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his seems to cause other problems.
See:
http://aspn.activestate.com/ASPN/Mail/Message/tcl-mac/2862062
http://aspn.activestate.com/ASPN/Mail/Message/tcl-mac/2862807
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fig there and run my python server
>n> script.
>n> Now here is the problem, server is returning strange characters
>n> although default encoding is the same on both development and server
>n> machines.
>n> Any hints?
Yes, read http://catb.org/esr/faqs/sma
nes from a file there will
>>> always be at least the newline character. Otherwise it would indeed fail:
>TR> Except possibly for the last line.
But then that line wouldn't be empty either.
If there is an empty line not terminated by a newline after the last
newline, then
IO module documentation, so
>PM> I probably missed something obvious. Could you explain how I get the
>PM> byte stream underlying sys.stdin? (That should give me enough to find
>PM> what I was misunderstanding in the docs).
http://docs.python.org/3.1/library/sys.html#sys.stdin
>>>>> peter (p) wrote:
>p> Whilst this is an interesting discussion about installers, I'm still
>p> trying to find a copy of PIL. Any ideas?
Pythonware is up again:
http://pythonware.com/products/pil/index.htm
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Piet van Oostrum
URL: http://pietvanoostrum.co
ce of the
subclass, not the name of the class that the method was defined in:
class D(C):
pass
D().f(1, 2) will talk about class D, not class C.
So if you would like to do something special for bound methods the
__get__ might be the proper place to do it.
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:
factorise(6) will return
[2, 2] (the powers are returned one higher than the actual value)
as in, 2^1 * 3^1 = 6."""
powers = []
power = 0
for factor in sieve():
power = 0
while num % factor == 0:
power += 1
num /
lobal Dlist
for q in Dlist:
yield q
while True:
q += 2
p = D.pop(q, 0)
if p:
x = q + p
while x in D: x += p
D[x] = p
else:
Dlist.append(q)
D[q*q] = 2*q
yield q
--
Piet van Oostrum
URL:
> this exception from the one that may be generated from the DH> amount of code that may raise a KeyError> line.
>DH> (ii) it moves the error handler for the DH> raise a KeyError> bit miles away from the line that might generate the
>DH> error, making it unclear which code the
>>>>> Scott David Daniels (SDD) wrote:
>SDD> # No need for global declarations, we alter, not replace
Yes, I know, but I find it neater to do the global declarations, if only
for documentation. And they don't affect the run time, only the compile
time.
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P
is one, which is
>DA> usually sooner than the square root. And no need to precalculate the
>DA> square root.
That's right. I thought of doing the sqrt trick by testing for num <
factor, i.e."
if num < factor:
break
but found out that it is useles
use a try/except to catch a KeyboardInterrupt exception, or you
>PS> can trap it using the signal module:
>PS> http://docs.python.org/library/signal.html
>PS> You want to trap SIGINT.
And make sure threads don't mess up the signal handling.
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Piet van Oostrum
UR
n k which = 11/14/2008
>N> here is the value that was returned 11/14/2008
>N> here is a list of the dictionary values [5]
>N> the length of the dictionary is 1
>>> Exit code: 0
Now in your code there is a 1-1 relation between printing
"here is the value that
ightly. Unless the screw
>SD> has been specifically designed to be hammered, hammering screws is pretty
>SD> much the definition of incompetence and/or laziness!
In our language (Dutch, i.e. Guido's mother tongue) `American
screwdriver' is an expression meaning `hammer' :=)
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1.5.2.
My first Python experience at home was on a 40MHz 80486 (Python 1.5.2 I
think). It was a bit slow :=(
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at lulu.com. It would even be nicer if
the PSF would offer them at lulu. They could even make some money from
it if enough copies would be sold..
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en tries to assign the
result of it to spam[0], which is not allowed. That the item it tries to
assign is the same as the item that was already there doesn't matter.
So dont't forget += is a real assignment, even when it is an in-place
modification. Your example just proves that. The language ref manual
says:
With the exception of assigning to tuples and multiple targets in a
single statement, the assignment done by augmented assignment
statements is handled the same way as normal assignments.
But I think that your example isn't for beginners either.
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se "x = x + y" until they have enough knowledge to
>SF> understand "augmented" assignment.
And *then* you can tell them that "x += y" can be subtly different from
"x = x + y", which is what happened in the example that the OP gave.
--
Piet van Oostru
CGI script.
Something like:
#! /usr/bin/env python
import cgi
from os import getenv
print "Content-type: text/html"
print
ipaddr = (getenv("HTTP_CLIENT_IP") or
getenv("HTTP_X_FORWARDED_FOR") or
getenv("HTTP_X_FORWARDED_FOR") or
getenv("REMOTE_ADDR") or
"UNKNOWN")
print ipaddr
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python code what command
C-c RET is bound to?
With C-h k C-c RET
Shell command succeeded with no output suggests that is has a different
binding than the standard one in python-mode.
Did you happen to name your file 'test' or 'test.py?
C-c RET does an import and 'import test&
>>>>> kj (k) wrote:
>k> In Piet van Oostrum writes:
>>>>>>>> kj (kj) wrote:
>kj> Does anyone know where I can buy the Python library reference in
>kj> printed form? (I'd rather not print the whole 1200+-page tome
>kj> mys
>>>>> Fred Atkinson (FA) wrote:
>FA> On Wed, 08 Jul 2009 12:29:54 +0200, Piet van Oostrum
>FA> wrote:
>>> Something like:
>>>
>>> #! /usr/bin/env python
>>>
>>> import cgi
>>> from os import getenv
>>>
your python file is located, otherwise the import statement will
not find your file. Unless it is somewhere in the python path. Also the
*Python* buffer will not automatically pop up if it is not visible, in
contrast with the *Python Output* buffer.
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age.
>L> Then I run python shell with C-c ! command. And:
>L> a) C-c RET opens *Python* buffer and prints 'hello world' in the
>L> python shell
>L> b) C-c C-c gives the same result.
Which version of python-mode.el do you have? (Variable py-version)
--
Piet van
i /home/bry/keys/brybackup.key"'
>CR> args = [rsyncExec, '-av', '--dry-run', '-e', rshArg, source, dest]
>CR> Note that the -e switch and its operand are separate arguments for the
>CR> purposes of POSIX shell tokenization.
I think you should have only one kind of quotes in rshArg:
rshArg = "/usr/bin/ssh -i /home/bry/keys/brybackup.key"
I haven't tried it, however, but this is just how Unix works.
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system.
#! /usr/bin/env python
from subprocess import Popen, PIPE
rsyncExec = '/usr/local/bin/rsync'
source = 'xxx.cs.uu.nl:/users/piet/yy'
dest = '/Users/piet/TEMP/test.rsync'
rshArg = &#
anyway (supposing int is 32 bits) but longs and then the same reasoning
shows that there are no overflows. Only when you have an array of shorts
or bytes (chars) you get the problem.
In that case the alternative formulation l + (u-l)/2 is more
robust and therefore preferable.
--
Piet van Oostrum
lso saves you the hassle
of doing your own synchronisation like above. If you are not familiar
with synchronising multithreaded applications it is very easy to make
errors and even if you are it is quite easy to do them wrong. I have
been involved in distributed programming c
section and uses the
>SM> library under construction)
>SM> if __name__ == '__main__':
>SM>import db_test
>SM>new_globals = {}
>SM>new_globals [ '__name__' ] = '__main__'
>SM>new_globals [ '__file__' ] = 'not really valuable'
>SM>execfile ( 'db_test.py', new_globals )
Why not:
import db_test
db_test.main()
I think that is what Aahz meant.
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generator I wrote so that I don't need two for
>CP> loops that do the same thing?
>CP> I tried writing a primes function using yield statements, but it didn't
>CP> work like I thought it would.
See the recent thread `Why is my code faster with append() in a loop tha
srvr.vlock.acquire()
>z> srvr.v += k
>z> srvr.vlock.release()
>z> self.myclntsock.send(srvr.v)
>z> self.myclntsock.close()
The last line is wrongly indented. It should be outside the loop. Shift
it left so that it line
. Try to make a *minimal* program
that shows the problem and include it in your posting or supply a
download link.
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y looking at it there are some interesting
>CP> patterns I might be able to extend into a generator that would
>CP> yield only correct sets of numbers for the 6x + n pattern.
As I wrote in my previous reply, in your use case the non-primes are
harmless. But it is useful to reflect tha
eful: I haven't tested this code (not even syntax checked). So
consider it pseudo code.*
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ute 'x'
>LD> Nope, still doesn't work...
Of course you need c = AttrDict()
And to get c.x = 4 working you also need a __setitem__.
And to get c["x"] working AtrrDict should subclass dict:
>>> class AttrDict(dict):
but these are only minor details :=)
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', '-v', '--dry-run'] + rshArgs + [ source, dest]
>>>
>>> Gary Duzan
>>> Motorola H&NM
>B> Separating the argument parts worked. Strangely though, I don
>>>>> Gabriel Rossetti (GR) wrote:
>GR> Piet van Oostrum wrote:
...
>GR> I wrote a small example that listens for xmpp msgs in a thread. The main
>GR> program calls a function that blocks (using Condition.wait) until a msg
>GR> has been received and then
ata1,data2, mydict):
print name, data1, data2
for nam in name:
for num in range(0,3):
mydict.setdefault(nam, [])
mydict[nam] += [data1[num]]
mydict[nam] += [data2[num]]
print 'Multiprocess test dic:',mydict
If you have more than one process operating on the dictionary
simultaneously you have to beware of race conditions!!
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related to ftp. Do you want to catch an exception like a misspelling in
one of the variables?
from ftplib import FTP, all_errors
try:
ftp = FTP(ftp_host)
ftp.login(ftp_user, ftp_pass)
except all_errors, err:
print err
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is kind of strange, since it
>DA> seems to me like an obvious question to ask.
Of course you can take any BST algorithm and replace pointers by indices
in the array and allocate new elements in the array. But then you need
array elements to contain the indices for the children explicitely.
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>>> That is a server configuration and has nothing to do with Python directly.
>FA> Agreed, it doesn't. But if my hosting provider won't change it, I'm
>FA> stuck with it.
That's a good reason to dislike your hosting provider, not a good reason
to dislike
configuring MTAs
>CB> 4. Even if all this works, you might just want to do your logging
>CB> directly in Python anyway
Even then, I think the program would get structured better if the FTP
code would only catch FTP-specific errors, including socket errors
(which is what all_errors do
>>>>> a...@pythoncraft.com (Aahz) (A) wrote:
>A> In article , Piet van Oostrum
>A> wrote:
>>> And to get c.x = 4 working you also need a __setitem__.
>A> Nope. You do need __setitem__ so that this works:
>A> c['x'] = 4
Sorry, I m
>>>>> Douglas Alan (DA) wrote:
>DA> I wrote:
>>> On Jul 14, 8:10 am, Piet van Oostrum wrote:
>>>
>>> > Of course you can take any BST algorithm and replace pointers by indices
>>> > in the array and allocate new elements in t
>>>>> a...@pythoncraft.com (Aahz) (A) wrote:
>A> In article , Piet van Oostrum
>wrote:
>>>>>>>> a...@pythoncraft.com (Aahz) (A) wrote:
>>>
>A> In article , Piet van Oostrum
>A> wrote:
>>>
>>>&
read):
def __init__(self, t, s, lock):
self.lock = lock
self.threadmarker = t
self.sleeptime = s
threading.Thread.__init__(self)
def run(self):
with lock:
print("Thread", self.threadmarker, "is going to sleep for
>>>>> Piet van Oostrum (PvO) wrote:
>PvO> def run(self):
>PvO> with lock:
All the 'with lock:' lines should have been 'with self.lock:' but as
lock is also a global variable, it did work. Of course you can decide to
use only t
mand lasts too long"
signal.signal(signalcode, handler)
def interrupt():
os.kill(os.getpid(), signalcode)
def execute(function, timeout):
Timer(timeout, interrupt).start()
try:
function()
except AlarmError, e:
print e
print 'Execution aborted'
fore the line.encode('utf-8'), but after
the decode('utf-8').
It might be better to use different variables for Unicode strings and
byte code strings to prevent confusion, like:
'line' is read as bytes from a stream
uline = line.decode('utf-8')
uline = uline.replace('<<', u'«').replace('>>', u'»')
line = uline.encode('utf-8')
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> Mark (M) wrote:
>M> You are right that it doesn't make sense to compare two dicts.
>M> But OrderedDicts can be viewed logically as lists of (key,value)
>M> tuples so they are much more like lists or tuples when it comes to
>M> comparisons.
>M> For example:
> l = [("a", 1), ("z", 2),
range(self.number * 10, (self.number + 1) * 10)
self.doit()
def doit(self):
for i in range(5):
sleep(3 * random())
self.data[i] += i
print self.data[i]
processes = []
for k in range(10):
p = MyProcess(k)
p.start()
proce
%s'%str(p2.getPid())
>m> else:
>m> p2.run()
>m> .
>m> .
>m> .
>m> So I'd like to load that data into memory once and keep there as long
>m> as th
, so you
would have a loop in the run(0 method getting work from the queue.
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vect = e_vect
def length(self):
return len(self.e_vect)
def __getitem__(self, indx):
return self.e_vect[indx]
I hope I did not make a mistake, I didn't check it because I don't want
to make test input files.
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Piet van Oostrum
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hing is inserted in the queue, another thread may sneak in while
you are waiting and snatch the inserted item just before your thread
continues after the wait. In that case you can't distinguish between a
timeout and a snatcher.
So it all depends on what your use case is.
(Java's wait
Unicode string. You can only
decode encoded things which are byte strings. So you are mixing up byte
strings and Unicode strings.
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Piet van Oostrum
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False, everything else True (with a slight
preference for 1 as True). Same as in C. Nowadays this is reflected in
bool being a subtype of int with False == 0 and True == 1. Actually it
is even closer: False and True are just 0 and 1 cast to bool, so to say.
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Piet van Oostrum
URL: http://pietvanoos
e subprocess makes changes in its copy
2. Each subprocess has a seperate data structure not equal to the others
3. Something else.
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imeout
>GR> as to not block forever, so the idea is to check if I returned because of a
>GR> timeout or not.
So that case is easy I think. After the wait just check if the answer
has arrived.
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Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email:
7;t decode bytes in position 0-2: invalid
>a> data
>a> for this line:
>a> â
Your Python assumes stdin uses utf-8 encoding, probably because your
locale says so. But it seems the input is not really utf-8 but some
other encoding.
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Piet van Oostrum
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>>>>> Gabriel Rossetti (GR) wrote:
>GR> Piet van Oostrum wrote:
>>>>>>>> Gabriel Rossetti (GR) wrote:
>>>>>>>>
>>>
>>>
>GR> I have a 1-1 relation, I have a thread reading msgs from a network sock
I should add that *if the wait times out* it still could be the case
that your answer has arrived but that the notify occured a microsecond
after the timeout. So knowing if the timeout occurred really doesn't
tell you much. It's just a way to prevent infinite waiting.
--
Piet van Oo
e XMLRPC.
By the way if the image file
is the only thing you send, the client should close the socket after
sending and then the receiver will detect end of file which will be
detected by your `if len(data) == 0:'
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Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
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gt;> a=A()
>>>>> b=B()
>>>>> c=C()
>>>>> a.hello()
>RG> 'hello: A'
>>>>> b.hello()
>RG> 'hello: B'
>>>>> c.hello()
>RG> 'hello: C'
>>>>>
>>>>> ma
gt;> t.connect(username=username, password=password)
Open a channel for a command
>>> chan = t.open_session()
>>> chan.exec_command('ls -l')
>>> chan.recv(99)
'total 0\ndrwxr-xr-x 2 user group 60 Apr 2 2009 Mail\ndrwx-- 2 user
group
>>>>> Piet van Oostrum (PvO) wrote:
[snip]
>PvO> You can also consider using paramiko instead of pexpect.
[snip]
>>>>> chan = t.open_session()
>>>>> chan.exec_command('cat')
>>>>> chan.send('abcdefghijklmn\n'
gt;>>>> x = [2,1,3]
>>>>>> print x.sort()[0]
>>> 3
>>>>>> print x
>>> [2,1,3]
>DB> You already have a way to do what you want:
>>>>> x = [2,1,3]
>>>>> print sorted(x)[0]
>DB> 3
What kind
>>>>> Paul Moore (PM) wrote:
>PM> 2009/7/20 Chris Rebert :
>>> On Mon, Jul 20, 2009 at 2:23 PM, Piet van Oostrum wrote:
>>>>>>>>> x = [2,1,3]
>>>>>>>>> print sorted(x)[0]
>DB> 3
>>>>
>>
int in the cartesian plane with
>HvR> an associated attribute like colour.
There are numerous other examples. Anytime you need a key that is not a
single object but composed of more than one:
Name + birthday
Street + number + City
Student + Course
etc.
--
Piet van Oostrum
URL: http://pietv
>>>>> David Smith (DS) wrote:
>DS> Piet van Oostrum wrote:
>>>>>>>> Hendrik van Rooyen (HvR) wrote:
>>>
>HvR> On Monday 20 July 2009 21:26:07 Phillip B Oldham wrote:
>>>>>> On Jul 20, 6:08 pm, Duncan Booth wro
ur answer.
Please:
1. Type your python code with newlines and proper indentation.
2. Show the error messages that your code gives when you run it.
3. Use proper capital letters at the beginning of your sentences.
4. Don't fire so many questions in rapid succession.
The recipient_public_key.p
stdout (and the others) must be None, PIPE or a real file object or file
descriptor, not a file like object. In your case the solution would be
to use PIPE, and then read the output and write in to the GzipFile
yourself.
f = gzip.open(filename, 'w')
proc = subprocess.Popen(['ls',
gt;d> 16:07:56
>d> 16:07:16
>d> 16:07:36
>d> 16:07:56
>d> 16:07:16
>d> 16:07:36
>d> 16:07:56
You probably meant: print time.strftime('%m-%d-%Y %H:%M:%S')
--
Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
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e.
>LPM> [1] Ex: 1 2 3 4 5 6 are elements of the bbt. If I use this operation given
>LPM> 4 as the parameter, the value returned would be 5.
http://newcenturycomputers.net/projects/rbtree.html (warning: see end of
page!)
http://pypi.python.org/pypi/rbtree/
http://pyavl.sou
st all relevant stuff (preferably
a minimal example that shows the problem). *DO NOT RETYPE THE CODE*
2. Copy and paste the output. *DO NOT RETYPE THE OUTPUT*
3. Tell what the expected or desired output is.
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Piet van Oostrum
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
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e path? Is that 4.6.0.0?
>JP> example:
>JP> file = "/home/dsp/test.py"
>JP> test = __import__(file)
>JP> works like a charm
That's not supposed to work. In older pythons it did work but that's a
bug. In newer pythons it doesn't. __import__ wo
>>>>> davidj411 (d) wrote:
>d> i never heard of the logging module, but this function seemed simple
>d> enough.
>d> i assume this link is what you refering to:
>d> http://docs.python.org/library/logging.html
>d> thanks for the helpful info. i think
>>>>> Scott David Daniels (SDD) schreef:
>SDD> Piet van Oostrum wrote:
>>> ...
>>> f = gzip.open(filename, 'w')
>>> proc = subprocess.Popen(['ls','-la'], stdout=subprocess.PIPE)
>>> while True:
>>>
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