Re: is decorator the right thing to use?
Dmitry S. Makovey schrieb: Dmitry S. Makovey wrote: In my real-life case A is a proxy to B, C and D instances/objects, not just one. forgot to mention that above would mean that I need to have more than one decorator function like AproxyB, AproxyC and AproxyD or make Aproxy smarter about which property of A has instance of which class etc. Unless I'm totally "out for lunch" and there are better ways of implementing this (other than copy-pasting stuff whenever anything in B, C or D changes). __getattr__? class Proxy(object): def __init__(self, delegate): self._delegate = delegate def __getattr__(self, attr): v = getattr(self._delegate, attr) if callable(v): class CallInterceptor(object): def __init__(self, f): self._f = f def __call__(self, *args, **kwargs): print "Called " + str(self._f) + " with " + str(args) + str(kwargs) return self._f(*args, **kwargs) return CallInterceptor(v) return v Decorators have *nothing* to do with this. They are syntactic sugar for def foo(...): ... foo = a_decorator(foo) Nothing less, nothing more. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: curses.setsyx()?
[EMAIL PROTECTED] wrote: >On Sep 23, 4:16 pm, [EMAIL PROTECTED] wrote: >> On Sep 22, 11:24 pm, Tim Roberts <[EMAIL PROTECTED]> wrote: >> > [EMAIL PROTECTED] wrote: >> > >On Sep 19, 6:42 pm, [EMAIL PROTECTED] wrote: >> > >> On Sep 19, 1:24 am, Tim Roberts <[EMAIL PROTECTED]> wrote: >> >> > >> > [EMAIL PROTECTED] wrote: >> >> > >> > >I tried curses.setsyx(2,3) in my script and it doesn't move the >> > >> > >curses >> > >> > >cursor. Any alternatives/solutions? >>... >> > >> I added it and it still doesn't work. This is what I'm doing when I >> > >> want to display the cursor and prepare it for input at 2,3: >> >> > >> curses.echo() >> > >> curses.curs_set(1) >> > >> curses.setsyx(2,3) >> > >> curses.doupdate() >> >> > >Any idea what's wrong? >> >> http://pastebin.com/m6413db1 >> >> Run that and press 'n' key. It is supposed to move the cursor to 2,3 >> and it doesn't. Of course it does. It moves the cursor, then does an update, then immediately calls draw.game, which redraws the screen and moves the cursor. If you want curses.setsyx (or the equivalent and more mnemonic scr.move) to leave the cursor somewhere, you can't draw more text afterward. -- Tim Roberts, [EMAIL PROTECTED] Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: Time.sleep(0.0125) not available within Linux
On Wed, 24 Sep 2008 22:18:05 +1200, Lawrence D'Oliveiro wrote: > Just a thought, your minimum sleep time is probably limited by the > resolution of the system "HZ" clock. Type > > less /proc/config.gz $ less /proc/config.gz /proc/config.gz: No such file or directory What OS are you using? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Off topic: Sent from my Foo messages
On Wed, 24 Sep 2008 20:04:14 -0700, Sean DiZazzo wrote: >> -- >> Steven > > I don't appreciate the two lines you put above your name in your posts. > Please remove them in the future. I don't like them either, but it is an email and Usenet standard to separate the body of your post from the signature with "-- ". I'm afraid that as obnoxious as the dashes are, leaving them out would be much worse. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: How to parse a string completely into a list
On Sep 24, 10:12 pm, Matt Nordhoff <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > On Sep 24, 9:44 pm, "Chris Rebert" <[EMAIL PROTECTED]> wrote:
> >> On Wed, Sep 24, 2008 at 8:30 PM, <[EMAIL PROTECTED]> wrote:
> >>> I want to take a long alpha-numeric string with \n and white-space and
> >>> place ALL elements of the string (even individual parts of a long
> >>> white-space) into separate list elements. The most common way I've
> >>> seen this performed is with the split() function, however I don't
> >>> believe that it has the power to do what I am looking for.
> >>> Any suggestions?
> >>> thanks
> >> Could you please define exactly what you mean by "elements" of a string?
>
> >> If you mean characters, then just use list():>>> list(" \n \t abc")
>
> >> [' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
>
> >> Regards,
> >> Chris
>
> > Worked like a charm.
> > kudos!
>
> Why do you need to convert it to a list? Strings are sequences, so you
> can do things like slice them or iterate through them by character:
>
> >>> for character in "foo":
>
> ... print character
> ...
> f
> o
> o
>
> --
The string draws a map that I then want to be able to traverse
through. If I can count through the individual characters of a list I
can create an x-y coordinate plane for navigation.
--
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Re: multiple processes with private working dirs
On Sep 25, 3:37 am, "Tim Arnold" <[EMAIL PROTECTED]> wrote: > Am I missing something? Do you mean something other than the replies you got the last time you asked the exact same question? http://groups.google.com/group/comp.lang.python/browse_frm/thread/42c13cbb84f88f2b -- http://mail.python.org/mailman/listinfo/python-list
Re: How to parse a string completely into a list
[EMAIL PROTECTED] wrote:
> On Sep 24, 9:44 pm, "Chris Rebert" <[EMAIL PROTECTED]> wrote:
>> On Wed, Sep 24, 2008 at 8:30 PM, <[EMAIL PROTECTED]> wrote:
>>> I want to take a long alpha-numeric string with \n and white-space and
>>> place ALL elements of the string (even individual parts of a long
>>> white-space) into separate list elements. The most common way I've
>>> seen this performed is with the split() function, however I don't
>>> believe that it has the power to do what I am looking for.
>>> Any suggestions?
>>> thanks
>> Could you please define exactly what you mean by "elements" of a string?
>>
>> If you mean characters, then just use list():>>> list(" \n \t abc")
>>
>> [' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
>>
>> Regards,
>> Chris
>
> Worked like a charm.
> kudos!
Why do you need to convert it to a list? Strings are sequences, so you
can do things like slice them or iterate through them by character:
>>> for character in "foo":
... print character
...
f
o
o
>>>
--
--
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multiple processes with private working dirs
I have a bunch of processes to run and each one needs its own working directory. I'd also like to know when all of the processes are finished. (1) First thought was threads, until I saw that os.chdir was process-global. (2) Next thought was fork, but I don't know how to signal when each child is finished. (3) Current thought is to break the process from a method into a external script; call the script in separate threads. This is the only way I can see to give each process a separate dir (external process fixes that), and I can find out when each process is finished (thread fixes that). Am I missing something? Is there a better way? I hate to rewrite this method as a script since I've got a lot of object metadata that I'll have to regenerate with each call of the script. thanks for any suggestions, --Tim Arnold -- http://mail.python.org/mailman/listinfo/python-list
The Python computer language
http://pythoncomputer.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to parse a string completely into a list
On Sep 24, 9:44 pm, "Chris Rebert" <[EMAIL PROTECTED]> wrote:
> On Wed, Sep 24, 2008 at 8:30 PM, <[EMAIL PROTECTED]> wrote:
> > I want to take a long alpha-numeric string with \n and white-space and
> > place ALL elements of the string (even individual parts of a long
> > white-space) into separate list elements. The most common way I've
> > seen this performed is with the split() function, however I don't
> > believe that it has the power to do what I am looking for.
> > Any suggestions?
> > thanks
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Could you please define exactly what you mean by "elements" of a string?
>
> If you mean characters, then just use list():>>> list(" \n \t abc")
>
> [' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
>
> Regards,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com
Worked like a charm.
kudos!
--
http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
Dmitry S. Makovey wrote: > In my real-life case A is a proxy to B, C and D instances/objects, not > just one. forgot to mention that above would mean that I need to have more than one decorator function like AproxyB, AproxyC and AproxyD or make Aproxy smarter about which property of A has instance of which class etc. Unless I'm totally "out for lunch" and there are better ways of implementing this (other than copy-pasting stuff whenever anything in B, C or D changes). -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
Aaron "Castironpi" Brady wrote: > It might help to tell us the order of events that you want in your > program. You're not using 'mymethod' or 'mymethod2', and you probably > want 'return fnew' for the future. Something dynamic with __getattr__ > might work. Any method call to A, that is an A instance, tries to > look up a method of the same name in the B instance it was initialized > with. well 'mymethod' and 'mymethod2' were there just to show that A doesn't function as a pure proxy - it has methods of it's own. See my respnse to Steve - I proxy messages to more than one aggregated object. going over them on __getattr__ to look up methods just doesn't seem to be really efficient to me (I might be wrong though). Decorators seemed to present good opportunity to simplify the code (well except for the decorator function itself :) ), make code bit more "fool-proofed" (and give me the opportunity to test decorators in real life, he-he). So decorators inside of B just identify that those methods will be proxied by A. On one hand from logical standpoint it's kind of weird to tell class that it is going to be proxied by another class, but declaration would be real close to original function definition which helps to identify where is it used. Note that my decorator doesn't change original function - it's a subversion of decorator to a certain degree as I'm just hooking into python machinery to add methods to A upon their declaration in B (or so I think). -- http://mail.python.org/mailman/listinfo/python-list
Re: How to parse a string completely into a list
On Wed, Sep 24, 2008 at 8:30 PM, <[EMAIL PROTECTED]> wrote:
> I want to take a long alpha-numeric string with \n and white-space and
> place ALL elements of the string (even individual parts of a long
> white-space) into separate list elements. The most common way I've
> seen this performed is with the split() function, however I don't
> believe that it has the power to do what I am looking for.
> Any suggestions?
> thanks
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Could you please define exactly what you mean by "elements" of a string?
If you mean characters, then just use list():
>>> list(" \n \t abc")
[' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
Regards,
Chris
--
Follow the path of the Iguana...
http://rebertia.com
--
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Re: Off topic: Sent from my Foo messages
Steven D'Aprano wrote: I'm seeing more and more posts from various people, on this list and others, with statements like the following: On Wed, 24 Sep 2008 18:45:35 -0400, David Di Biase wrote: Sent from my iPhone Also "Sent from my Blackberry" and similar. Without wishing to be rude to David, who I'm sure is a nice guy and not at all the pretentious git that such a line makes him appear, are people adding this comment to the bottom of their posts, or is it something that their device automatically appends to the post? If people are adding it themselves, that's nice, I'm sure you're really excited about your new toy, but the rest of us don't care a monkey's toss. And if the device is automatically appending it, I think that's pretty damn rude and a good reason to avoid buying the obnoxious machines. At least it is just one tag line and the the 20 lines of legal 'If you received this in error' spam some organizations tack on the end ;-). -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
[EMAIL PROTECTED] wrote:
> Your code below is very abstract, so it's kind of hard to figure out
> what problem you're trying to solve, but it seems to me that you're
> using the B proxy class to decorate the A target class, which means
> you want one of these options:
Sorry for unclarities in original post. Basically A aggregates object of
class B (example with no decorators and again it's oversimplified):
class A:
b=None
def __init__(self,b):
self.b=b
def amethod(self,a):
print "A::amethod ", a
def bmethod(self,a):
print "A::bmethod ",a
return self.b.bmethod(a)
def bmethod2(self,a,z):
print "A::bmethod2 ",a,z
return self.b.bmethod2(a,z)
class B:
def __init__(self):
self.val=a
def bmethod(self,a):
print "B::bmethod ",a
def bmethod2(self,a,z):
print "B::bmethod2 ",a,z
b=B()
a=A(b)
a.bmethod('foo')
a.bmethod2('bar','baz')
In my real-life case A is a proxy to B, C and D instances/objects, not just
one. If you look at above code - whenever I write new method in either B, C
or D I have to modify A, or even when I modify signature (say, add
parameter x to bmethod) in B, C or D I have to make sure A is synchronized.
I was hoping to use decorator to do it automatically for me. Since the
resulting code is virtually all the same for all those proxy methods it
seems to be a good place for automation. Or am I wrong assuming that?
(since it is my first time using decorators I honestly don't know)
Abovementioned code ilustrates what I am doing right now. My original post
is an attempt to make things more automated/foolproof.
--
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Re: Schwartzian transform for tuple in list
David Di Biase wrote: When you say slightly, is it enough to make a difference? Why would getitems be faster even - not sure I can think why... Using key is faster than cmp because key is called just once for each item whereas cmp is called once for each of the O(nlogn) compares. Operator.itemgetter is written in C and hence should be faster than a wrapper written in Python. -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
On Sep 24, 5:21 pm, "Dmitry S. Makovey" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> after hearing a lot about decorators and never actually using one I have
> decided to give it a try. My particular usecase is that I have class that
> acts as a proxy to other classes (i.e. passes messages along to those
> classes) however hand-coding this type of class is rather tedious, so I
> decided to use decorator for that. Can somebody tell me if what I'm doing
> is a potential shot-in-the-foot or am I on the right track? (Note, It's
> rather rudimentary proof-of-concept implementation and not the final
> solution I'm about to employ so there are no optimizations or
> signature-preserving code there yet, just the idea).
>
> Here's the code:
>
> class A:
> b=None
> def __init__(self,b):
> self.val='aval'
> self.b=b
> b.val='aval'
>
> def mymethod(self,a):
> print "A::mymethod, ",a
>
> def mymethod2(self,a):
> print "A::another method, ",a
>
> def Aproxy(fn):
> def delegate(*args,**kw):
> print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
> args=list(args)
> b=getattr(args[0],'b')
> fnew=getattr(b,fn.__name__)
> # get rid of original object reference
> del args[0]
> fnew(*args,**kw)
> setattr(A,fn.__name__,delegate)
> return fn
>
> class B:
> def __init__(self):
> self.val='bval'
>
> @Aproxy
> def bmethod(self,a):
> print "B::bmethod"
> print a, self.val
>
> @Aproxy
> def bmethod2(self,a):
> print "B::bmethod2"
> print a, self.val
>
> b=B()
> b.bmethod('foo')
> a=A(b)
> b=B()
> b.val='newval'
> a.bmethod('bar')
> a.bmethod2('zam')
It might help to tell us the order of events that you want in your
program. You're not using 'mymethod' or 'mymethod2', and you probably
want 'return fnew' for the future. Something dynamic with __getattr__
might work. Any method call to A, that is an A instance, tries to
look up a method of the same name in the B instance it was initialized
with.
a.foo( ) -> 'in a.foo' -> 'calling b.foo' -> 'return' -> 'return'
a.mymethod( ) -> 'in a.mymethod' -> 'calling b.mymethod' ->
AttributeError: 'b' has no attribute 'mymethod'.
--
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How to parse a string completely into a list
I want to take a long alpha-numeric string with \n and white-space and place ALL elements of the string (even individual parts of a long white-space) into separate list elements. The most common way I've seen this performed is with the split() function, however I don't believe that it has the power to do what I am looking for. Any suggestions? thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: multiple processes, private working directories
On Sep 24, 9:27 pm, Tim Arnold <[EMAIL PROTECTED]> wrote: > (2) Next thought was fork, but I don't know how to signal when each > child is > finished. Consider the multiprocessing module, which is available in Python 2.6, but it began its life as a third-party module that acts like threading module but uses processes. I think you can still run it as a third- party module in 2.5. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: python syntax for conditional is unfortunate
On Sep 24, 9:49 pm, Asun Friere <[EMAIL PROTECTED]> wrote:
> On Sep 25, 11:57 am, "Aaron \"Castironpi\" Brady"
>
> <[EMAIL PROTECTED]> wrote:
> > On Sep 24, 8:40 pm, Asun Friere <[EMAIL PROTECTED]> wrote:
> > > ... I think
> > > your last version ('%d thing%s' % (i, 's' if i != 1 else '')), holding
> > > all variables for placeholders in the tuple, is better. It's certainly
> > > more readible.
>
> > It's a different answer if you have 'things is/are'. '%d thing%s %s'%
> > ( ( i, )+ ( 's', 'are' ) if i!= 1 else ( '', 'is' ) ). Or excluding
> > prepositional phrases and subordinate clauses, '%d thing%s'% ( i, 's
> > are' if i!= 1 else ' is' ).
>
> Forgive me for being dull, my caffeine levels have not yet optimal,
> but I don't follow. Both the solutions you propose do put all the
> placeholder variables in the tuple. Or are you saying it no longer
> remains readible?
>
> BTW you repeated my mistake with the first scraplet of code.
Ah yes. Maybe the order of precedence can undergo a change in the
future. ... Though talk about backwards incompatible. They were two
options if you have a verb with your noun, which would need a
conditional too.
--
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Re: multiple processes, private working directories
On Sep 24, 6:27 pm, Tim Arnold <[EMAIL PROTECTED]> wrote: > I have a bunch of processes to run and each one needs its own working > directory. I'd also like to know when all of the processes are > finished. > > (1) First thought was threads, until I saw that os.chdir was process- > global. > (2) Next thought was fork, but I don't know how to signal when each > child is > finished. > (3) Current thought is to break the process from a method into a > external > script; call the script in separate threads. This is the only way I > can see > to give each process a separate dir (external process fixes that), and > I can > find out when each process is finished (thread fixes that). > > Am I missing something? Is there a better way? I hate to rewrite this > method > as a script since I've got a lot of object metadata that I'll have to > regenerate with each call of the script. Use subprocess; it supports a cwd argument to provide the given directory as the child's working directory. Help on class Popen in module subprocess: class Popen(__builtin__.object) | Methods defined here: | | __del__(self) | | __init__(self, args, bufsize=0, executable=None, stdin=None, stdout=None, st derr=None, preexec_fn=None, close_fds=False, shell=False, cwd=None, env=None, un iversal_newlines=False, startupinfo=None, creationflags=0) | Create new Popen instance. You want to provide the cwd argument above. Then once you have launched all your n processes, run thru' a loop waiting for each one to finish. # cmds is a list of dicts providing details on what processes to run.. what it's cwd should be runs = [] for c in cmds: run = subprocess.Popen(cmds['cmd'], cwd = cmds['cwd'] . etc other args) runs.append(run) # Now wait for all the processes to finish for run in runs: run.wait() Note that if any of the processes generate lot of stdout/stderr, you will get a deadlock in the above loop. Then you way want to go for threads or use run.poll and do the reading of the output from your child processes. Karthik > > thanks for any suggestions, > --Tim Arnold -- http://mail.python.org/mailman/listinfo/python-list
Re: Off topic: Sent from my Foo messages
> -- > Steven I don't appreciate the two lines you put above your name in your posts. Please remove them in the future. ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: Off topic: Sent from my Foo messages
On Wed, Sep 24, 2008 at 7:38 PM, Steven D'Aprano <[EMAIL PROTECTED]> wrote: > I'm seeing more and more posts from various people, on this list and > others, with statements like the following: > > On Wed, 24 Sep 2008 18:45:35 -0400, David Di Biase wrote: > >> Sent from my iPhone > > Also "Sent from my Blackberry" and similar. > > Without wishing to be rude to David, who I'm sure is a nice guy and not > at all the pretentious git that such a line makes him appear, are people > adding this comment to the bottom of their posts, or is it something that > their device automatically appends to the post? It's on by default for the iPhone/iTouch but there's a setting to change the signature (including to nothing). Don't know about the Blackberry. > > If people are adding it themselves, that's nice, I'm sure you're really > excited about your new toy, but the rest of us don't care a monkey's > toss. And if the device is automatically appending it, I think that's > pretty damn rude and a good reason to avoid buying the obnoxious machines. Eh, that's a bit extreme; though I admit it can sometimes be annoying (but not very much). Regards, Chris Sent using a Computer, the Internet, Gmail, Firefox, unix, glibc, ... ;P > > > > -- > Steven > -- > http://mail.python.org/mailman/listinfo/python-list > -- Follow the path of the Iguana... http://rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: python syntax for conditional is unfortunate
On Sep 25, 11:57 am, "Aaron \"Castironpi\" Brady"
<[EMAIL PROTECTED]> wrote:
> On Sep 24, 8:40 pm, Asun Friere <[EMAIL PROTECTED]> wrote:
> > ... I think
> > your last version ('%d thing%s' % (i, 's' if i != 1 else '')), holding
> > all variables for placeholders in the tuple, is better. It's certainly
> > more readible.
>
> It's a different answer if you have 'things is/are'. '%d thing%s %s'%
> ( ( i, )+ ( 's', 'are' ) if i!= 1 else ( '', 'is' ) ). Or excluding
> prepositional phrases and subordinate clauses, '%d thing%s'% ( i, 's
> are' if i!= 1 else ' is' ).
Forgive me for being dull, my caffeine levels have not yet optimal,
but I don't follow. Both the solutions you propose do put all the
placeholder variables in the tuple. Or are you saying it no longer
remains readible?
BTW you repeated my mistake with the first scraplet of code.
--
http://mail.python.org/mailman/listinfo/python-list
Off topic: Sent from my Foo messages
I'm seeing more and more posts from various people, on this list and others, with statements like the following: On Wed, 24 Sep 2008 18:45:35 -0400, David Di Biase wrote: > Sent from my iPhone Also "Sent from my Blackberry" and similar. Without wishing to be rude to David, who I'm sure is a nice guy and not at all the pretentious git that such a line makes him appear, are people adding this comment to the bottom of their posts, or is it something that their device automatically appends to the post? If people are adding it themselves, that's nice, I'm sure you're really excited about your new toy, but the rest of us don't care a monkey's toss. And if the device is automatically appending it, I think that's pretty damn rude and a good reason to avoid buying the obnoxious machines. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Comparing float and decimal
On Wed, 24 Sep 2008 04:30:03 -0500, Nick Craig-Wood wrote:
> Both the Fraction module and the Decimal module could represent floats
> exactly and reversibly since floats are of the form
>
> mantissa * 2**exponent
>
> which is exactly representable as a fraction (rational) and also as
>
> mantissa2 * 10**exponent2
>
> as to why we don't do this...
>
> I guess it is to preserve the sanity of the user when they write
> fraction(0.1) or decimal(0.1) did they really mean fraction(1,10),
> decimal("0.1") or the exact representations which are
> decimal("0.155511151231257827021181583404541015625") and
> fraction(3602879701896397,2**55)
I would say that in practice the chances that somebody *actually* wanted
0.155511151231257827021181583404541015625 when they wrote
0.1 is about the same as the chances that the BDFL will support braces in
Python 3.0.
(Hint: "from __future__ import braces")
> Given that we let the exact representations leak out anyway (which
> causes a lot of FAQs in this list), eg
>
0.1
> 0.10001
>
> IMHO We should put the exact conversions in for floats to Decimal and
> Fraction by default and add a new section to the FAQ!
But of the reasons for having the Decimal module is to avoid such leaky
abstractions. Without Decimal (or fraction) there's no obvious way to get
0.1 exactly. It seems perverse to suggest that by default Decimal should
deliberately expose the same leaky abstraction that causes so much
trouble when people use floats.
> In that way people will see floats for what they really are - a crude
> approximation to a rational number ;-)
You can already see that just by printing a float:
>>> 0.3
0.2
>>> 0.1
0.10001
--
Steven
--
http://mail.python.org/mailman/listinfo/python-list
Re: urllib error on urlopen
On Wed, 24 Sep 2008 08:46:56 -0700, Mike Driscoll wrote:
> Hi,
>
> I have been using the following code for over a year in one of my
> programs:
>
> f = urllib2.urlopen('https://www.companywebsite.com/somestring')
>
> It worked great until the middle of the afternoon yesterday. Now I get
> the following traceback:
...
> URLError: routines:SSL23_GET_SERVER_HELLO:unknown protocol')>
Have you recently set a proxy where Python can auto-detect it? I
understand that urllib2 doesn't work well with https proxies.
If so, you can instruct urllib2 not to use a proxy-handler, but it's more
work. What I do is construct an opener without a proxyhandler:
# untested...
no_proxy_support = urllib2.ProxyHandler({})
opener = urllib2.build_opener(no_proxy_support)
f = opener.open('https://www.companywebsite.com/somestring')
If that doesn't work, you may need to build a Request object from the URL
before passing it to opener.open.
--
Steven
--
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Re: Making small executive file for distribution
On 2008-09-25, Larry Bates <[EMAIL PROTECTED]> wrote: > Marin Brkic wrote: >> Not commercial distribution, but an academic kind of sorts - giving >> the exe file to coleagues, so they can use it in their work. Giving >> .py file is not an option, since due to centralized computer >> maintenance, they don't (and cannot) have installed python (except the >> ones that bring their own computer at work, but those are an >> exception). >> >> As far as I know py2exe is the only option which can do such a thing >> (make exe files from scripts). Is there a way to make those exe files >> a little smaller (for a small script they easily go up to 5-10 mb). > Times have changed, 5-10Mb is REALLY small. Flash drives hold 4000-8000Mb > for less than $20 and standard hard drives are now 500Gb. IMHO you are > concerned about a problem that doesn't actually exist. But what if he wants to distribute his program on a floppy disk? ;) [I think only 1 of my 5 machines has a floppy drive, and the last time I tried to use it, it didn't work. I did have a usb-floppy drive somewhere, but I think somebody borrowed it a couple years ago and never returned it.] -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: empty csv file attachments
On Sep 24, 1:17 pm, Bobby Roberts <[EMAIL PROTECTED]> wrote:
> hi group.
>
> I'm new to python but a veteran at programming. This one has me
> stumped. I have a simple contact form which the user fills out. The
> email is sent to the site user as well and it is delivered with the
> content in the body of the email as well in nice order. I have
> modified my code to also send the content as a csv attachment. On the
> server, the file is perfectly generated with content. The attachment,
> however, is completely blank. Any ideas what that could be? My code
> snippet is shown below:
>
> if int(attachmenttype)==2 or int(attachmenttype)==3:
> for field in ctx.request.field_names():
> if field=='last_name':
> myfilename=ctx.request.field_value(field)+'.txt'
> if myfilename=='':
> myfilename='tempfile.txt'
> mypath= mynewfilepath + '/' + myfilename
> f=open(mypath, 'w')
> mynewstring=''
> counter=0
> for field in ctx.request.field_names():
> if field != 'inquiry_required':
> mynewstring=mynewstring + field +','
> if mynewstring[-1]==',':
> mynewstring=mynewstring[0:len(mynewstring)-1]
> f.write(mynewstring)
> f.write ('\n')
>
> mynewstring=''
> counter=1
> for field in ctx.request.field_names():
> fielddata=ctx.request.field_value(field)
> if counter==1:
> dummydata=0
> else:
> mynewstring=mynewstring + '"' + fielddata.replace('"','')
> + '",'
> counter = counter + 1
> if mynewstring[-1]==',':
> mynewstring=mynewstring[0:len(mynewstring)-1]
> f.write(mynewstring)
> f.write('\n')
> f.close
> attachments.append('/'.join((ctx.request.library,
> myfilename)))
>
> [snip... sends email just after this]
>
> any ideas?
I would sprinkle some print statements in there to narrow it down...
~Sean
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Re: Making small executive file for distribution
Marin Brkic wrote: Not commercial distribution, but an academic kind of sorts - giving the exe file to coleagues, so they can use it in their work. Giving .py file is not an option, since due to centralized computer maintenance, they don't (and cannot) have installed python (except the ones that bring their own computer at work, but those are an exception). As far as I know py2exe is the only option which can do such a thing (make exe files from scripts). Is there a way to make those exe files a little smaller (for a small script they easily go up to 5-10 mb). Has anyone had a situation like this ? All your inputs and suggestions are more then welcomed. -- Marin Times have changed, 5-10Mb is REALLY small. Flash drives hold 4000-8000Mb for less than $20 and standard hard drives are now 500Gb. IMHO you are concerned about a problem that doesn't actually exist. -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
On Wed, 24 Sep 2008 17:11:28 -0400, Ross Ridge wrote: > Plenty of people were quick to say that the exception should be passed > through to the caller. No one said this behaviour should be documented. > There may be little practical difference bewteen calling sys.exit() > after printing an error and progating an exception if no one using the > library knows that it could generate that exception in those > circumstances. That's true, I didn't explicitly say that the library should be documented. Nor did I say that it shouldn't be riddled with bugs. There's little practical difference between a buggy library and one that raises unexpected (i.e. undocumented) exceptions either. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
Duncan Booth wrote: > r0g <[EMAIL PROTECTED]> wrote: > >> OK so maybe I'm being naive here but it looks to me like this new >> paradigm's big idea is to use a python + SQL type syntax to access data >> in random objects. Big whoop. It's not that difficult to write a >> generators that wraps XML files and databases is it? >> >> What am I missing here? > > Simple LINQ expressions like the one you gave map easily to Python list > comprehensions. What Microsoft have done though is provide a consistent > implementation which allows you to write complex SQL like expressions which > will work identically on databases or most other sequence types. Hmm, that's a nice idea in theory but I don't think it's the python killer Mr/Ms bearophile thinks it is. I can't think of any use cases where this would save me a great deal of time (certainly not enough to offset the relative slowness of working in C#) but supposing they do exist this stuff definitely belongs in a module. Seems to me C# is playing catchup in most ways and this nugget of 'innovation' is just the exception that proves the rule. Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
On Sep 24, 3:21 pm, "Dmitry S. Makovey" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> after hearing a lot about decorators and never actually using one I have
> decided to give it a try. My particular usecase is that I have class that
> acts as a proxy to other classes (i.e. passes messages along to those
> classes) however hand-coding this type of class is rather tedious, so I
> decided to use decorator for that. Can somebody tell me if what I'm doing
> is a potential shot-in-the-foot or am I on the right track? (Note, It's
> rather rudimentary proof-of-concept implementation and not the final
> solution I'm about to employ so there are no optimizations or
> signature-preserving code there yet, just the idea).
>
Your code below is very abstract, so it's kind of hard to figure out
what problem you're trying to solve, but it seems to me that you're
using the B proxy class to decorate the A target class, which means
you want one of these options:
1) Put decorators over the methods in A, not B. Isn't it the
methods of A that are being decorated here?
2) Eliminate the decorator syntax and make your code more
expressive:
a = SomeClass()
# first call it directly
x = a.foo()
y = a.bar()
# now decorate it
debug_proxy =
ClassThatDecoratesMethodCallsToObjectWithDebuggingCode(a)
debug_proxy.decorate_methods('foo', 'bar')
The decorate_methods method would be magical, in terms of overwriting
a's innards, while still preserving the same interface for its users.
But again, I'm just guessing here, because it's hard to know what
problem you're really solving.
Cheers,
Steve
Code quoted below:
> Here's the code:
>
> class A:
> b=None
> def __init__(self,b):
> self.val='aval'
> self.b=b
> b.val='aval'
>
> def mymethod(self,a):
> print "A::mymethod, ",a
>
> def mymethod2(self,a):
> print "A::another method, ",a
>
> def Aproxy(fn):
> def delegate(*args,**kw):
> print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
> args=list(args)
> b=getattr(args[0],'b')
> fnew=getattr(b,fn.__name__)
> # get rid of original object reference
> del args[0]
> fnew(*args,**kw)
> setattr(A,fn.__name__,delegate)
> return fn
>
> class B:
> def __init__(self):
> self.val='bval'
>
> @Aproxy
> def bmethod(self,a):
> print "B::bmethod"
> print a, self.val
>
> @Aproxy
> def bmethod2(self,a):
> print "B::bmethod2"
> print a, self.val
>
> b=B()
> b.bmethod('foo')
> a=A(b)
> b=B()
> b.val='newval'
> a.bmethod('bar')
> a.bmethod2('zam')
--
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Re: multiple processes, private working directories
On Sep 24, 9:27 pm, Tim Arnold <[EMAIL PROTECTED]> wrote: > I have a bunch of processes to run and each one needs its own working > directory. I'd also like to know when all of the processes are > finished. > > (1) First thought was threads, until I saw that os.chdir was process- > global. > (2) Next thought was fork, but I don't know how to signal when each > child is > finished. > (3) Current thought is to break the process from a method into a > external > script; call the script in separate threads. This is the only way I > can see > to give each process a separate dir (external process fixes that), and > I can > find out when each process is finished (thread fixes that). > > Am I missing something? Is there a better way? I hate to rewrite this > method > as a script since I've got a lot of object metadata that I'll have to > regenerate with each call of the script. > > thanks for any suggestions, > --Tim Arnold 1, Does the work in the different directories really have to be done concurrently? You say you'd like to know when each thread/process was finished, suggesting that they are not server processes but rather accomplish some limited task. 2. If the answer to 1. is yes: All that os.chdir gives you is an implicit global variable. Is that convenience really worth a multi- process architecture? Would it not be easier to just work with explicit path names instead? You could store the path of the per- thread working directory in an instance of threading.local - for example: >>> import threading >>> t = threading.local() >>> >>> class Worker(threading.Thread): ... def __init__(self, path): ... t.path=path ... the thread-specific value of t.path would then be available to all classes and functions running within that thread. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
On Wed, 24 Sep 2008 10:54:40 -0500, Grant Edwards wrote: > You're right. I had forgotten that sys.exit() is actually raising the > system exit exception, and that the application calling the library > could handle that exception. Could but shouldn't. The exception hierarchy was re-designed in Python 2.5 specifically so that SystemExit and KeyboardInterrupt no longer inherit from Exception. That means this will do the right thing: try: process(record) if changed: update(record) except Exception: # don't write the record if any error occurs pass Neither SystemExit nor KeyboardInterrupt are errors, and they should not be treated as errors. I quote from the Fine Manual: [SystemExit] inherits from BaseException instead of StandardError or Exception so that it is not accidentally caught by code that catches Exception. This allows the exception to properly propagate up and cause the interpreter to exit. http://docs.python.org/lib/module-exceptions.html SystemExit is not an error. KeyboardInterrupt is not an error. Libraries should not use SystemExit to signal an error any more than they should use MemoryError to signal a missing attribute. Whether or not an application exits is up to the application to decide, not the library it wraps. Libraries should report errors by raising an Exception (note the capital E), and the application should decide whether or not it is recoverable, and if not, exit (perhaps by simply not catching the exception). -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: multiple processes, private working directories
On 24Sep2008 18:27, Tim Arnold <[EMAIL PROTECTED]> wrote: | I have a bunch of processes to run and each one needs its own working | directory. I'd also like to know when all of the processes are | finished. | | (1) First thought was threads, until I saw that os.chdir was process- | global. Yep. But do you need separate working directories? As opposed to having the thread state include a notional working directory and constructing file paths within it. | (2) Next thought was fork, but I don't know how to signal when each | child is finished. Open a pipe (os.pipe()). Have a parent process to track state. Fork each child. In each child: close the read end of the pipe. Do stuff. When finished, close the write end of the pipe. In the parent, after forking all children: close the write end of the pipe. Read from the read end. When all the children have finished they will have closed all the write ends and you will see EOF on the read end of the pipe. For extra credit you can have the children write some sort of success/failure byte to the pipe before closing. Counting and examinine these bytes in the parent can tell you about individual failure if you care. | (3) Current thought is to break the process from a method into a | external | script; call the script in separate threads. This is the only way I | can see | to give each process a separate dir (external process fixes that), and | I can | find out when each process is finished (thread fixes that). Yeah, that'll work: for child in 1 2 3 4 5 6 ... do mkdir workdir ( cd work-dir; run-child ) & done wait | Am I missing something? Is there a better way? I hate to rewrite this | method | as a script since I've got a lot of object metadata that I'll have to | regenerate with each call of the script. See the pipe scheme in point (2) above. Doubtless there are other methods, but pipes are each shared resources with the right behaviour. I'd prefer method (1) myself, assuming you have control of the working file paths. Cheers, -- Cameron Simpson <[EMAIL PROTECTED]> DoD#743 http://www.cskk.ezoshosting.com/cs/ If everyone is thinking alike, then someone isn't thinking. - Patton -- http://mail.python.org/mailman/listinfo/python-list
Re: python syntax for conditional is unfortunate
On Sep 24, 8:40 pm, Asun Friere <[EMAIL PROTECTED]> wrote:
> On Sep 25, 3:16 am, Pete Forman <[EMAIL PROTECTED]> wrote:
>
> > Asun Friere <[EMAIL PROTECTED]> writes:
>
> > > A canonical use of the conditional operator is in
> > > pluralising words, (eg. '%s dollar' % n + 's' if n!=1 else '').
>
> > That fails for n == 1. So what is best?
>
> Sorry missing parantheses. I should test, even for fragments written
> out as part of a sentence. %-/
>
> > for i in range(4):
> > print '%d thing' % i + ('s' if i != 1 else '')
>
> That's the corrected version of what I meant, but actually I think
> your last version ('%d thing%s' % (i, 's' if i != 1 else '')), holding
> all variables for placeholders in the tuple, is better. It's certainly
> more readible.
It's a different answer if you have 'things is/are'. '%d thing%s %s'%
( ( i, )+ ( 's', 'are' ) if i!= 1 else ( '', 'is' ) ). Or excluding
prepositional phrases and subordinate clauses, '%d thing%s'% ( i, 's
are' if i!= 1 else ' is' ).
--
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Re: multiple processes, private working directories
Tim Arnold wrote: > I have a bunch of processes to run and each one needs its own working > directory. I'd also like to know when all of the processes are > finished. > > (1) First thought was threads, until I saw that os.chdir was process- > global. > (2) Next thought was fork, but I don't know how to signal when each > child is > finished. > (3) Current thought is to break the process from a method into a > external > script; call the script in separate threads. This is the only way I > can see > to give each process a separate dir (external process fixes that), and > I can > find out when each process is finished (thread fixes that). > > Am I missing something? Is there a better way? I hate to rewrite this > method > as a script since I've got a lot of object metadata that I'll have to > regenerate with each call of the script. > > thanks for any suggestions, > --Tim Arnold (1) + avoid os.chdir and maintain hard paths to all files/folders? or (2) + sockets? or (2) + polling your systems task list? -- http://mail.python.org/mailman/listinfo/python-list
Re: python syntax for conditional is unfortunate
On Sep 25, 3:16 am, Pete Forman <[EMAIL PROTECTED]> wrote:
> Asun Friere <[EMAIL PROTECTED]> writes:
>
> > A canonical use of the conditional operator is in
> > pluralising words, (eg. '%s dollar' % n + 's' if n!=1 else '').
>
> That fails for n == 1. So what is best?
>
Sorry missing parantheses. I should test, even for fragments written
out as part of a sentence. %-/
> for i in range(4):
> print '%d thing' % i + ('s' if i != 1 else '')
>
That's the corrected version of what I meant, but actually I think
your last version ('%d thing%s' % (i, 's' if i != 1 else '')), holding
all variables for placeholders in the tuple, is better. It's certainly
more readible.
--
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Re: python syntax for conditional is unfortunate
On Sep 25, 3:16 am, Pete Forman <[EMAIL PROTECTED]> wrote:
> Asun Friere <[EMAIL PROTECTED]> writes:
>
> > A canonical use of the conditional operator is in
> > pluralising words, (eg. '%s dollar' % n + 's' if n!=1 else '').
>
> That fails for n == 1. So what is best?
>
Sorry missing parentheses. I should test before posting, even for
code written into.
> for i in range(4):
> print '%d thing' % i + ('s' if i != 1 else '')
That is the correct version of what I meant, but your last, including
all variables for placeholders in the tuple is probably better.
--
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multiple processes, private working directories
I have a bunch of processes to run and each one needs its own working directory. I'd also like to know when all of the processes are finished. (1) First thought was threads, until I saw that os.chdir was process- global. (2) Next thought was fork, but I don't know how to signal when each child is finished. (3) Current thought is to break the process from a method into a external script; call the script in separate threads. This is the only way I can see to give each process a separate dir (external process fixes that), and I can find out when each process is finished (thread fixes that). Am I missing something? Is there a better way? I hate to rewrite this method as a script since I've got a lot of object metadata that I'll have to regenerate with each call of the script. thanks for any suggestions, --Tim Arnold -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On 2008-09-24, Bruno Desthuilliers <[EMAIL PROTECTED]> wrote: > hrishy a écrit : > (snip) > > >> I apologise >> (I thought Python programmers were smart and they did know what LINQ was) > > Is there really any relation between "being smart" and knowing anything > about the latest MS fad ? God, I hope not -- or I'd rather be stupid. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Er, one -lime- or two.
A Python walks into a bar and orders a complex data structure. Bartender says, "One line or two?" -- http://mail.python.org/mailman/listinfo/python-list
Re: PyRun_SimpleFile() crashes
On 9月25日, 午前1:05, "Aaron \"Castironpi\" Brady" <[EMAIL PROTECTED]>
wrote:
> On Sep 24, 6:30 am, Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
>
>
>
> > [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > > my code:
> > > main.cpp
> > > #include
>
> > > int main(int argc, char **argv)
> > > {
> > > Py_Initialize();
>
> > > FILE *file_1 = fopen("a2l_reader.py","r+");
> > > PyRun_SimpleFile(file_1,"a2l_reader.py");
>
> > > Py_Finalize();
> > > }
>
> > > compile under windows using MinGW:
> > > g++ main.cpp libpython25.a -o a
>
> > > no error was found. But when I run a.exe the program just crashes.
>
> > > What should I do?
>
> > Run it under gdb (which should have come with MinGW).
>
> > Check that you actually opened the file, ie file_1 != 0.
>
> > This might be relevant
>
> > http://effbot.org/pyfaq/pyrun-simplefile-crashes-on-windows-but-not-o...
>
> > --
> > Nick Craig-Wood <[EMAIL PROTECTED]> --http://www.craig-wood.com/nick
>
> There's a workaround.
>
> filename = "Entire path of the python file";
> PyObject* PyFileObject = PyFile_FromString(filename, "r");
> PyRun_SimpleFile(PyFile_AsFile(PyFileObject), filename);
> // decref PyFileObject
>
> http://mail.python.org/pipermail/python-list/2007-March/431725.htmlhttp://python-forum.org/pythonforum/viewtopic.php?f=15&t=1554&p=6567
Wow this one works fine for me.
Thank you!
--
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Re: urllib error on urlopen
On Sep 24, 11:46 am, Mike Driscoll <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I have been using the following code for over a year in one of my
> programs:
>
> f = urllib2.urlopen('https://www.companywebsite.com/somestring')
>
> It worked great until the middle of the afternoon yesterday. Now I get
> the following traceback:
>
> Traceback (most recent call last):
> File "", line 1, in
> response = urllib2.urlopen(req).read().strip()
> File "c:\python25\lib\urllib2.py", line 124, in urlopen
> return _opener.open(url, data)
> File "c:\python25\lib\urllib2.py", line 381, in open
> response = self._open(req, data)
> File "c:\python25\lib\urllib2.py", line 399, in _open
> '_open', req)
> File "c:\python25\lib\urllib2.py", line 360, in _call_chain
> result = func(*args)
> File "c:\python25\lib\urllib2.py", line 1115, in https_open
> return self.do_open(httplib.HTTPSConnection, req)
> File "c:\python25\lib\urllib2.py", line 1082, in do_open
> raise URLError(err)
> URLError: routines:SSL23_GET_SERVER_HELLO:unknown protocol')>
>
> I tried my Google Fu on this error, but there's not much out there. I
> tried using a proxy in Python, but that returned the same traceback.
> If I copy the URL into my browser, it resolves correctly. Does anyone
> have any advice on how to troubleshoot this error?
>
> I am using Python 2.5.2 on Windows XP.
>
> Thanks,
>
> Mike
Could it just be a misconfiguration at the other end? Can you open
other https urls?
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Re: Making small executive file for distribution
On Wed, 24 Sep 2008 14:50:56 -0700 (PDT), sturlamolden <[EMAIL PROTECTED]> wrote: >On Sep 24, 3:17 pm, Marin Brkic <[EMAIL PROTECTED]> wrote: > >> Has anyone had a situation like this ? All your inputs and suggestions >> are more then welcomed. > >Send them the .py file and confirm that it does work. The lack of >Python can be blamed on the incompetent BOFH. Chances are the >situation will change when the BOFH gets 20 requests for Python a >day. > Yes, I agree. But in large institutions, where system engineers maintain a lot of computers there usually exists a policy on what is installed on computers and what is not. And currently python is not. And it's not gonna change anytime soon since only few of us are using it (2 of us use it on personal laptops, to others we send exe files). -- Marin -- http://mail.python.org/mailman/listinfo/python-list
Re: Folder Actions on Mac OSX Leopard?
On Sep 24, 12:31 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > Greetings, > > I've been trying to figure out if it's possible to attach a Python > script to an action via Mac OSX Leopard's File Actions system. I'm > wanting to call a Python script every time a file is added to the > monitored folder. Just adding a .py file doesn't seem to do anything > at all, and I can't find any log output anywhere to see what's going > on. > > I'm more just looking to see if this is or is not possible. I'm not > interested in other solutions, as I already have them lined up in case > this is a no-go, but I'd really love to be able to do it this way if > anyone has any experience. Googling around revealed pretty much > nothing. > > Any help is much appreciated, > Greg I always wondered about Folder Actions... I just tested. You can have applescript call python scripts via `do shell script`. But it seemed a bit flakey. I would either go with applescript all the way, or look in to your other options. ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: Folder Actions on Mac OSX Leopard?
[EMAIL PROTECTED] schrieb: Greetings, I've been trying to figure out if it's possible to attach a Python script to an action via Mac OSX Leopard's File Actions system. I'm wanting to call a Python script every time a file is added to the monitored folder. Just adding a .py file doesn't seem to do anything at all, and I can't find any log output anywhere to see what's going on. I'm more just looking to see if this is or is not possible. I'm not interested in other solutions, as I already have them lined up in case this is a no-go, but I'd really love to be able to do it this way if anyone has any experience. Googling around revealed pretty much nothing. You mean this? http://developer.apple.com/documentation/Darwin/Conceptual/FSEvents_ProgGuide/Introduction/chapter_2_section_1.html *I* would use ctypes to access Carbon Core. But then that's just me - I'm sure you find a better way... Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Sep 24, 4:59 pm, Duncan Booth <[EMAIL PROTECTED]> wrote: ... > I haven't yet had occasion to use LINQ in anger yet, so I have no idea > whether its an idea to love or to hate. I do think it is good that C# has > effectively sprouted list comprehensions (not to mention anonymous types > and type inferencing) and I expect there may be some aspects worth looking > at for Python but I think they are more likely to lead to itertools > functions than extensions to syntax. My thoughts exactly when I first looked at it. "Hey C# NOW has list comprehensions!!! SWEET!!!" As I understand it LINQ is libraries(System.Data.Linq.dll, System.XML.Linq.dll) + syntactic sugar, i wouldn't call that a change to the language. The addition of lambdas and functions as first class objects however, that was indeed a language change, and it was a change for the better that makes LINQ possible, (also makes writing delegates less cumbersome). To someone other than a C# person, these features are not new or revolutionary, it's just C# catching up. Kudos to them for getting there before java. After some more thought on what might conceivably be missing from python that LINQ has, that someone might want is the equivalent of System.XML.Linq.dll, and I can't see any reason why someone couldn't write it with the exception that there doesn't seem to be a definitive XML lib for python, meaning generally regarded as the best. That in my mind would be a prerequisite. But if someone wrote both the XML lib with the LINQ-ish syntax, maybe it would become the definitive XML lib. Again, I personally don't see myself using XML and thus needing that unless my hand was forced by some business requirement that dictated I use XML, I would not use it if I had a choice. The SQL LiNQ-ish though, I think every python ORM has that covered to a degree, and I use that quite a bit. -- http://mail.python.org/mailman/listinfo/python-list
Re: Schwartzian transform for tuple in list
When you say slightly, is it enough to make a difference? Why would getitems be faster even - not sure I can think why... Sent from my iPhone On 24-Sep-08, at 5:46 PM, Matt Nordhoff <[EMAIL PROTECTED]> wrote: Chris Rebert wrote: On Wed, Sep 24, 2008 at 2:02 PM, David Di Biase <[EMAIL PROTECTED] > wrote: Hi, I have a rather large list structure with tuples contained in them (it's part of a specification I received) looks like so: [(x1,y1,r1,d1),(x2,y2,r2,d2)...] The list can range from about 800-1500 tuples in size and I'm currently sorting it with this: a_list.sort(lambda a, b: cmp(b[3], a[3])) You'd probably be better off using the 'key' keyword argument to .sort(), which is made for the Schwartzian Transform: a_list.sort(key=lambda x: x[3]) This sorts the list items by the value produced by the key function for each item. It's also (IIRC) faster than using a comparison function like you're currently doing. Regards, Chris Yes, using 'key' is faster than 'cmp'. If you have Python 2.4 or newer, it would also be slightly faster to use operator.itemgetter() instead of a lambda: import operator a_list.sort(key=operator.itemgetter(3)) I'm actually sorting it by the last value in the tuple (d2). I have been researching more efficient sorting algorithms and came across Schwartzian transform via these links: http://www.biais.org/blog/index.php/2007/01/28/23-python-sorting-efficiency http://dev.fyicenter.com/Interview-Questions/Python/Can_you_do_a_Schwartzian_Transform_in_Python_.html I get what's happening (sorta...errr...lol) but I'm not sure if it is more efficient in my scenario, if it is then I have no idea how to implement it properly :-/ Would be great if a true expert would offer a suggestion for me... Thanks! David -- -- http://mail.python.org/mailman/listinfo/python-list
is decorator the right thing to use?
Hi,
after hearing a lot about decorators and never actually using one I have
decided to give it a try. My particular usecase is that I have class that
acts as a proxy to other classes (i.e. passes messages along to those
classes) however hand-coding this type of class is rather tedious, so I
decided to use decorator for that. Can somebody tell me if what I'm doing
is a potential shot-in-the-foot or am I on the right track? (Note, It's
rather rudimentary proof-of-concept implementation and not the final
solution I'm about to employ so there are no optimizations or
signature-preserving code there yet, just the idea).
Here's the code:
class A:
b=None
def __init__(self,b):
self.val='aval'
self.b=b
b.val='aval'
def mymethod(self,a):
print "A::mymethod, ",a
def mymethod2(self,a):
print "A::another method, ",a
def Aproxy(fn):
def delegate(*args,**kw):
print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
args=list(args)
b=getattr(args[0],'b')
fnew=getattr(b,fn.__name__)
# get rid of original object reference
del args[0]
fnew(*args,**kw)
setattr(A,fn.__name__,delegate)
return fn
class B:
def __init__(self):
self.val='bval'
@Aproxy
def bmethod(self,a):
print "B::bmethod"
print a, self.val
@Aproxy
def bmethod2(self,a):
print "B::bmethod2"
print a, self.val
b=B()
b.bmethod('foo')
a=A(b)
b=B()
b.val='newval'
a.bmethod('bar')
a.bmethod2('zam')
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
> Why, yes, I am wearing my BOFH hat. How could you tell? > > -- > Tim Rowe evil, but I think you may be a BSEFH, not a BOFH. -- http://mail.python.org/mailman/listinfo/python-list
Re: Making small executive file for distribution
On Sep 24, 3:17 pm, Marin Brkic <[EMAIL PROTECTED]> wrote: > Has anyone had a situation like this ? All your inputs and suggestions > are more then welcomed. Send them the .py file and confirm that it does work. The lack of Python can be blamed on the incompetent BOFH. Chances are the situation will change when the BOFH gets 20 requests for Python a day. -- http://mail.python.org/mailman/listinfo/python-list
Re: Schwartzian transform for tuple in list
Chris Rebert wrote: > On Wed, Sep 24, 2008 at 2:02 PM, David Di Biase <[EMAIL PROTECTED]> wrote: >> Hi, >> >> I have a rather large list structure with tuples contained in them (it's >> part of a specification I received) looks like so: >> [(x1,y1,r1,d1),(x2,y2,r2,d2)...] >> >> The list can range from about 800-1500 tuples in size and I'm currently >> sorting it with this: >> >> a_list.sort(lambda a, b: cmp(b[3], a[3])) > > You'd probably be better off using the 'key' keyword argument to > .sort(), which is made for the Schwartzian Transform: > > a_list.sort(key=lambda x: x[3]) > > This sorts the list items by the value produced by the key function > for each item. It's also (IIRC) faster than using a comparison > function like you're currently doing. > > Regards, > Chris Yes, using 'key' is faster than 'cmp'. If you have Python 2.4 or newer, it would also be slightly faster to use operator.itemgetter() instead of a lambda: >>> import operator >>> a_list.sort(key=operator.itemgetter(3)) >> I'm actually sorting it by the last value in the tuple (d2). I have been >> researching more efficient sorting algorithms and came across Schwartzian >> transform via these links: >> >> http://www.biais.org/blog/index.php/2007/01/28/23-python-sorting-efficiency >> http://dev.fyicenter.com/Interview-Questions/Python/Can_you_do_a_Schwartzian_Transform_in_Python_.html >> >> I get what's happening (sorta...errr...lol) but I'm not sure if it is more >> efficient in my scenario, if it is then I have no idea how to implement it >> properly :-/ >> >> Would be great if a true expert would offer a suggestion for me... >> >> Thanks! >> >> David -- -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Sep 24, 10:59 pm, Duncan Booth <[EMAIL PROTECTED]> wrote: > Simple LINQ expressions like the one you gave map easily to Python list > comprehensions. What Microsoft have done though is provide a consistent > implementation which allows you to write complex SQL like expressions which > will work identically on databases or most other sequence types. > han extensions to syntax. List comprehensions work with any iterable sequence. You can nest them to make more complex statements. You can also use a generator to iterate through a database or an XML document. Here is approximately where linq stops being a marvelous addition to Python. And I can honestly do without the SQL syntax. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
Grant Edwards <[EMAIL PROTECTED]> wrote: > Same here. It's like an automotive engine controls designer > asking if a failed O2 sensor should turn on the check engine > light or blow up the car. Ross Ridge <[EMAIL PROTECTED]> wrote: > No, it's more like asking if the failed sensor should turn on > a strange and mysterious light on the dashboard Grant Edwards <[EMAIL PROTECTED]> wrote: > You're right. I had forgotten that sys.exit() is actually > raising the system exit exception, and that the application > calling the library could handle that exception. Ross Ridge a écrit : > Well, my point was that exceptions in Python are a bit like a car's > check engine light. Few drivers know what this mysterious light means, > and aren't prepared to do anything about it when it goes on. Bruno Desthuilliers <[EMAIL PROTECTED]> wrote: >You're kidding, aren't you ? Of course not. Plenty of people were quick to say that the exception should be passed through to the caller. No one said this behaviour should be documented. There may be little practical difference bewteen calling sys.exit() after printing an error and progating an exception if no one using the library knows that it could generate that exception in those circumstances. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] [EMAIL PROTECTED] -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db // -- http://mail.python.org/mailman/listinfo/python-list
Re: Schwartzian transform for tuple in list
On Wed, Sep 24, 2008 at 2:02 PM, David Di Biase <[EMAIL PROTECTED]> wrote: > Hi, > > I have a rather large list structure with tuples contained in them (it's > part of a specification I received) looks like so: > [(x1,y1,r1,d1),(x2,y2,r2,d2)...] > > The list can range from about 800-1500 tuples in size and I'm currently > sorting it with this: > > a_list.sort(lambda a, b: cmp(b[3], a[3])) You'd probably be better off using the 'key' keyword argument to .sort(), which is made for the Schwartzian Transform: a_list.sort(key=lambda x: x[3]) This sorts the list items by the value produced by the key function for each item. It's also (IIRC) faster than using a comparison function like you're currently doing. Regards, Chris > > I'm actually sorting it by the last value in the tuple (d2). I have been > researching more efficient sorting algorithms and came across Schwartzian > transform via these links: > > http://www.biais.org/blog/index.php/2007/01/28/23-python-sorting-efficiency > http://dev.fyicenter.com/Interview-Questions/Python/Can_you_do_a_Schwartzian_Transform_in_Python_.html > > I get what's happening (sorta...errr...lol) but I'm not sure if it is more > efficient in my scenario, if it is then I have no idea how to implement it > properly :-/ > > Would be great if a true expert would offer a suggestion for me... > > Thanks! > > David > > -- > http://mail.python.org/mailman/listinfo/python-list > -- Follow the path of the Iguana... http://rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Schwartzian transform for tuple in list
Hi, I have a rather large list structure with tuples contained in them (it's part of a specification I received) looks like so: [(x1,y1,r1,d1),(x2,y2,r2,d2)...] The list can range from about 800-1500 tuples in size and I'm currently sorting it with this: a_list.sort(lambda a, b: cmp(b[3], a[3])) I'm actually sorting it by the last value in the tuple (d2). I have been researching more efficient sorting algorithms and came across Schwartzian transform via these links: - http://www.biais.org/blog/index.php/2007/01/28/23-python-sorting-efficiency - http://dev.fyicenter.com/Interview-Questions/Python/Can_you_do_a_Schwartzian_Transform_in_Python_.html I get what's happening (sorta...errr...lol) but I'm not sure if it is more efficient in my scenario, if it is then I have no idea how to implement it properly :-/ Would be great if a true expert would offer a suggestion for me... Thanks! David -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
r0g <[EMAIL PROTECTED]> wrote:
> OK so maybe I'm being naive here but it looks to me like this new
> paradigm's big idea is to use a python + SQL type syntax to access data
> in random objects. Big whoop. It's not that difficult to write a
> generators that wraps XML files and databases is it?
>
> What am I missing here?
Simple LINQ expressions like the one you gave map easily to Python list
comprehensions. What Microsoft have done though is provide a consistent
implementation which allows you to write complex SQL like expressions which
will work identically on databases or most other sequence types.
Here's another LINQ example:
List customers = GetCustomerList();
var customerOrderGroups =
from c in customers
select
new {c.CompanyName,
YearGroups =
from o in c.Orders
group o by o.OrderDate.Year into yg
select
new {Year = yg.Key,
MonthGroups =
from o in yg
group o by o.OrderDate.Month into mg
select new { Month = mg.Key, Orders = mg }
}
};
ObjectDumper.Write(customerOrderGroups, 3);
I'm not overly keen on SQL syntax: I think this sort of complex expression
is hard to read. LINQ has a pretty straightforward conversion to method
calls, and for me this consistent set of methods is the important thing
rather than the SQL syntax. e.g. 'group by' maps directly to a call to a
method GroupBy(), so another of Microsoft's LINQ examples is:
public void Linq45() {
string[] anagrams = {"from ", " salt", " earn ", " last ",
" near ", " form "};
var orderGroups = anagrams.GroupBy(
w => w.Trim(),
a => a.ToUpper(),
new AnagramEqualityComparer()
);
ObjectDumper.Write(orderGroups, 1);
}
public class AnagramEqualityComparer : IEqualityComparer
{
public bool Equals(string x, string y) {
return getCanonicalString(x) == getCanonicalString(y);
}
public int GetHashCode(string obj) {
return getCanonicalString(obj).GetHashCode();
}
private string getCanonicalString(string word) {
char[] wordChars = word.ToCharArray();
Array.Sort(wordChars);
return new string(wordChars);
}
}
Python still wins hands down on this example both in verbosity and
readability:
>>> anagrams = ["from ", " salt", " earn ", " last ",
" near ", " form "]
>>> from itertools import groupby
>>> def AnagramKey(w):
return sorted(w.strip().upper())
>>> for k,words in groupby(sorted(anagrams, key=AnagramKey),
key=AnagramKey):
for w in words:
print w.strip().upper()
print "..."
EARN
NEAR
...
SALT
LAST
...
FROM
FORM
...
I haven't yet had occasion to use LINQ in anger yet, so I have no idea
whether its an idea to love or to hate. I do think it is good that C# has
effectively sprouted list comprehensions (not to mention anonymous types
and type inferencing) and I expect there may be some aspects worth looking
at for Python but I think they are more likely to lead to itertools
functions than extensions to syntax.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Sep 24, 9:11 pm, [EMAIL PROTECTED] wrote: > In the meantime where I > live lot of people will keep using C# instead of Python and CLisp, > natural selection at work indeed. Please explain to me what Linq can do that Python does not. Put you emphasis on why this can't be done with a library, and thus will require addition of new syntax to the language. -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
hrishy a écrit : (snip) I apologise (I thought Python programmers were smart and they did know what LINQ was) Is there really any relation between "being smart" and knowing anything about the latest MS fad ? -- http://mail.python.org/mailman/listinfo/python-list
Fwd: Twisted vs. CherryPy vs. ??? for light-weight web servers
I just want to be able to write simple scripts to serve xml data and don't want the headache of administrating an apache server. I want to collect some data from some of our production servers and share them with a sharepoint website. On Wed, Sep 24, 2008 at 12:29 PM, Jean-Paul Calderone <[EMAIL PROTECTED]>wrote: > On Tue, 23 Sep 2008 21:22:08 -0500, Michael Mabin <[EMAIL PROTECTED]> > wrote: > >> Is there any consensus on what the best lightweight web-server is? Or >> rather would Twisted be a better choice to choose as a framework that >> allows >> me to serve html or xml data for light webservices. Or is CherryPy just as >> good? >> >> > You haven't described the problem you want to solve in very much detail. I > can't tell, for example, why I shouldn't recommend that you use Apache > instead > of CherryPy or Twisted or anything else. Apache has a huge user community, > lots of documentation, and lots of developers fixing its bugs and making it > work well. What are you trying to do that would make Apache a bad choice? > > Jean-Paul > > -- > http://mail.python.org/mailman/listinfo/python-list > -- | _ | * | _ | | _ | _ | * | | * | * | * | -- | _ | * | _ | | _ | _ | * | | * | * | * | -- http://mail.python.org/mailman/listinfo/python-list
empty csv file attachments
hi group.
I'm new to python but a veteran at programming. This one has me
stumped. I have a simple contact form which the user fills out. The
email is sent to the site user as well and it is delivered with the
content in the body of the email as well in nice order. I have
modified my code to also send the content as a csv attachment. On the
server, the file is perfectly generated with content. The attachment,
however, is completely blank. Any ideas what that could be? My code
snippet is shown below:
if int(attachmenttype)==2 or int(attachmenttype)==3:
for field in ctx.request.field_names():
if field=='last_name':
myfilename=ctx.request.field_value(field)+'.txt'
if myfilename=='':
myfilename='tempfile.txt'
mypath= mynewfilepath + '/' + myfilename
f=open(mypath, 'w')
mynewstring=''
counter=0
for field in ctx.request.field_names():
if field != 'inquiry_required':
mynewstring=mynewstring + field +','
if mynewstring[-1]==',':
mynewstring=mynewstring[0:len(mynewstring)-1]
f.write(mynewstring)
f.write ('\n')
mynewstring=''
counter=1
for field in ctx.request.field_names():
fielddata=ctx.request.field_value(field)
if counter==1:
dummydata=0
else:
mynewstring=mynewstring + '"' + fielddata.replace('"','')
+ '",'
counter = counter + 1
if mynewstring[-1]==',':
mynewstring=mynewstring[0:len(mynewstring)-1]
f.write(mynewstring)
f.write('\n')
f.close
attachments.append('/'.join((ctx.request.library,
myfilename)))
[snip... sends email just after this]
any ideas?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
[EMAIL PROTECTED] wrote:
> sturlamolden:
>> No, because Python already has list comprehensions and we don't need the XML
>> buzzword.<
>
> LINQ is more than buzzwords. Python misses several of those features.
> So maybe for once the Python crowd may recognize such C# feature as
> much better than things present in Python.
> Said that, I presume Python will go on as usual, and LINQ-like
> capabilities will not be integrated in Python. In the meantime where I
> live lot of people will keep using C# instead of Python and CLisp,
> natural selection at work indeed.
>
> Bye,
> bearophile
LOL, I just read that and thought - Ok this sounds serious I'd better go
find out what this LINQ business is all about so I googled.. and ended
up on MSDN where there's impressive sounding talk about how we need a
way to query databases and XML files with a unified syntax like we do
for for standard datatypes like files and arrays. Well yes,that makes
sense I think and proceed to look at their example code, curious as to
what this new paradigm looks like:
using System;
using System.Linq;
using System.Collections.Generic;
class app {
static void Main() {
string[] names = { "Burke", "Connor", "Frank",
"Everett", "Albert", "George",
"Harris", "David" };
IEnumerable query = from s in names
where s.Length == 5
orderby s
select s.ToUpper();
foreach (string item in query)
Console.WriteLine(item);
}
}
ROTFLMAO! Wow, what progress they're making! Quick guys let's jump on
before we get left behind - we dont want to miss out on this exciting
and mysterious 'foreach' construct or this strange and exotic sounding
'IEnumerable query' thing. To think that python might someday reach such
lofty heights where we'll be able to simply write...
names = ["Burke", "Connor", "Frank", "Everett",
"Albert", "George", "Harris", "David"]
result = [each.upper() for each in names if len(each) == 5]
result.sort()
for each in result: print each
Yes clearly 'the Python crowd' must admit LINQ is 'much better', I'm
sold, in fact off to download my "Free, but limited editions of Visual
Studio 2005 for a single programming language supported by .NET" right away!
OK so maybe I'm being naive here but it looks to me like this new
paradigm's big idea is to use a python + SQL type syntax to access data
in random objects. Big whoop. It's not that difficult to write a
generators that wraps XML files and databases is it?
What am I missing here?
Roger Heathcote.
--
http://mail.python.org/mailman/listinfo/python-list
empty csv file attachments
hi group.
I'm new to python but a veteran at programming. This one has me
stumped. I have a simple contact form which the user fills out. The
email is sent to the site user as well and it is delivered with the
content in the body of the email as well in nice order. I have
modified my code to also send the content as a csv attachment. On the
server, the file is perfectly generated with content. The attachment,
however, is completely blank. Any ideas what that could be? My code
snippet is shown below:
if int(attachmenttype)==2 or int(attachmenttype)==3:
for field in ctx.request.field_names():
if field=='last_name':
myfilename=ctx.request.field_value(field)+'.txt'
if myfilename=='':
myfilename='tempfile.txt'
mypath= mynewfilepath + '/' + myfilename
f=open(mypath, 'w')
mynewstring=''
counter=0
for field in ctx.request.field_names():
if field != 'inquiry_required':
mynewstring=mynewstring + field +','
if mynewstring[-1]==',':
mynewstring=mynewstring[0:len(mynewstring)-1]
f.write(mynewstring)
f.write ('\n')
mynewstring=''
counter=1
for field in ctx.request.field_names():
fielddata=ctx.request.field_value(field)
if counter==1:
dummydata=0
else:
mynewstring=mynewstring + '"' + fielddata.replace('"','')
+ '",'
counter = counter + 1
if mynewstring[-1]==',':
mynewstring=mynewstring[0:len(mynewstring)-1]
f.write(mynewstring)
f.write('\n')
f.close
attachments.append('/'.join((ctx.request.library,
myfilename)))
[snip... sends email just after this]
any ideas?
--
http://mail.python.org/mailman/listinfo/python-list
online pharmacy perscription.dt8v1
Start saving, best online pharmacy here http://defgjkmahl.nufehrurald.net/?bciahlxwvrsydefgjkzchcmm -- http://mail.python.org/mailman/listinfo/python-list
Re: PyRun_SimpleFile() crashes
On Sep 24, 11:05 am, "Aaron \"Castironpi\" Brady"
<[EMAIL PROTECTED]> wrote:
> On Sep 24, 6:30 am, Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
>
>
>
> > [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > > my code:
> > > main.cpp
> > > #include
>
> > > int main(int argc, char **argv)
> > > {
> > > Py_Initialize();
>
> > > FILE *file_1 = fopen("a2l_reader.py","r+");
> > > PyRun_SimpleFile(file_1,"a2l_reader.py");
>
> > > Py_Finalize();
> > > }
>
> > > compile under windows using MinGW:
> > > g++ main.cpp libpython25.a -o a
>
> > > no error was found. But when I run a.exe the program just crashes.
>
> > > What should I do?
>
> > Run it under gdb (which should have come with MinGW).
>
> > Check that you actually opened the file, ie file_1 != 0.
>
> > This might be relevant
>
> > http://effbot.org/pyfaq/pyrun-simplefile-crashes-on-windows-but-not-o...
>
> > --
> > Nick Craig-Wood <[EMAIL PROTECTED]> --http://www.craig-wood.com/nick
>
> There's a workaround.
>
> filename = "Entire path of the python file";
> PyObject* PyFileObject = PyFile_FromString(filename, "r");
> PyRun_SimpleFile(PyFile_AsFile(PyFileObject), filename);
> // decref PyFileObject
>
> http://mail.python.org/pipermail/python-list/2007-March/431725.htmlhttp://python-forum.org/pythonforum/viewtopic.php?f=15&t=1554&p=6567
Just to follow up-- The links say that the crash comes from opening a
file with two different versions of a library. Would it be possible
to get an API entry point to the version the build uses?
It does use the 'fopen' function by name, but not the same version.
And creating the entire object just to get its f_fp field is really
long.
--
http://mail.python.org/mailman/listinfo/python-list
Quick & Secured Pharmacy Online. rdjr0
Start saving, best online pharmacy here http://fjmgilbh.zarubanlo.net/?acdekbhxwvrsyfjmzchcmgil -- http://mail.python.org/mailman/listinfo/python-list
Folder Actions on Mac OSX Leopard?
Greetings, I've been trying to figure out if it's possible to attach a Python script to an action via Mac OSX Leopard's File Actions system. I'm wanting to call a Python script every time a file is added to the monitored folder. Just adding a .py file doesn't seem to do anything at all, and I can't find any log output anywhere to see what's going on. I'm more just looking to see if this is or is not possible. I'm not interested in other solutions, as I already have them lined up in case this is a no-go, but I'd really love to be able to do it this way if anyone has any experience. Googling around revealed pretty much nothing. Any help is much appreciated, Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
Ross Ridge a écrit : (snip) Grant Edwards <[EMAIL PROTECTED]> wrote: Same here. It's like an automotive engine controls designer asking if a failed O2 sensor should turn on the check engine light or blow up the car. Ross Ridge <[EMAIL PROTECTED]> wrote: No, it's more like asking if the failed sensor should turn on a strange and mysterious light on the dashboard Grant Edwards <[EMAIL PROTECTED]> wrote: You're right. I had forgotten that sys.exit() is actually raising the system exit exception, and that the application calling the library could handle that exception. Well, my point was that exceptions in Python are a bit like a car's check engine light. Few drivers know what this mysterious light means, and aren't prepared to do anything about it when it goes on. You're kidding, aren't you ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Wed, Sep 24, 2008 at 2:11 PM, <[EMAIL PROTECTED]> wrote: > sturlamolden: >>No, because Python already has list comprehensions and we don't need the XML >>buzzword.< > > LINQ is more than buzzwords. Python misses several of those features. > So maybe for once the Python crowd may recognize such C# feature as > much better than things present in Python. > Said that, I presume Python will go on as usual, and LINQ-like > capabilities will not be integrated in Python. In the meantime where I > live lot of people will keep using C# instead of Python and CLisp, > natural selection at work indeed. > Why do you swing so widely between being an interesting poster with interesting, useful things to say and mindless trolling? There's a lot of reasons to use C# instead of Python or Lisp (or any other language for that matter), but I can't imagine that someone would make that decision based solely on LINQ. I'd go so far as to say that if they do, I question their professional competence. LINQ is an interesting implementation of an old idea. The place where it differs from list comps is that it has appropriate hooks for the specific linq implementation to override the way results are gathered, and such hooks in Python would be an interesting idea. I've taken a shot and figuring out where and how they should be implemented, but I haven't come up with anything I like. Maybe you should try it? LINQs "native" object API (not the syntax sugar available in C#) is not very different from Python ORMs. -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Python GUI development using XULRunner
Todd, this is great! Thanks for your work on this. I've been using your extension for awhile, successfully creating little apps. Your gui_app template has been a huge help in advancing my understanding of how things fit together...takes some of the guesswork out. :) Thanks again, -j On Sep 16, 8:29 pm, Todd Whiteman <[EMAIL PROTECTED]> wrote: > I've put together a tutorial that shows off how to build a GUI > application using XULRunner (same architectural components as Firefox > uses) that can be used in conjunction with the Python programming language. > > The tutorial covers how to build a Python/XULRunner GUI > application:http://pyxpcomext.mozdev.org/no_wrap/tutorials/pyxulrunner/python_xul... > > The details in this tutorial covers the initial setup to full > packaging/deployment, mostly targeting a Windows/Linux platform (MacOSX > is possible with a few deviations, I have tried to cover these > deviations where applicable). > > Feedback is welcome. > > Cheers, > Todd -- http://mail.python.org/mailman/listinfo/python-list
RE: More regex help
Kirk,
That's exactly what I needed. Thx!
-Original Message-
From: Kirk Strauser [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 24, 2008 11:42 AM
To: python-list@python.org
Subject: Re: More regex help
At 2008-09-24T16:25:02Z, "Support Desk" <[EMAIL PROTECTED]> writes:
> I am working on a python webcrawler, that will extract all links from an
> html page, and add them to a queue, The problem I am having is building
> absolute links from relative links, as there are so many different types
of
> relative links. If I just append the relative links to the current url,
some
> websites will send it into a never-ending loop.
>>> import urllib
>>> urllib.basejoin('http://www.example.com/path/to/deep/page',
'/foo')
'http://www.example.com/foo'
>>> urllib.basejoin('http://www.example.com/path/to/deep/page',
'http://slashdot.org/foo')
'http://slashdot.org/foo'
--
Kirk Strauser
The Day Companies
--
http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
[EMAIL PROTECTED] wrote: sturlamolden: No, because Python already has list comprehensions and we don't need the XML buzzword.< LINQ is more than buzzwords. Python misses several of those features. So maybe for once the Python crowd may recognize such C# feature as much better than things present in Python. Said that, I presume Python will go on as usual, and LINQ-like capabilities will not be integrated in Python. In the meantime where I live lot of people will keep using C# instead of Python and CLisp, natural selection at work indeed. Perhaps a quick summary of what LINQ offers which might "be integrated into Python" would help those of us who are ignorant? (This is a serious comment; I'd like to know). TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
sturlamolden: >No, because Python already has list comprehensions and we don't need the XML >buzzword.< LINQ is more than buzzwords. Python misses several of those features. So maybe for once the Python crowd may recognize such C# feature as much better than things present in Python. Said that, I presume Python will go on as usual, and LINQ-like capabilities will not be integrated in Python. In the meantime where I live lot of people will keep using C# instead of Python and CLisp, natural selection at work indeed. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
Steven D'Aprano <[EMAIL PROTECTED]> wrote: > Presumably somebody has suggested that calling sys.exit() was a good > option. I'm curious to what possible reason they could give for such a > poor choice. Grant Edwards <[EMAIL PROTECTED]> wrote: >Same here. It's like an automotive engine controls designer >asking if a failed O2 sensor should turn on the check engine >light or blow up the car. Ross Ridge <[EMAIL PROTECTED]> wrote: > No, it's more like asking if the failed sensor should turn on > a strange and mysterious light on the dashboard Grant Edwards <[EMAIL PROTECTED]> wrote: >You're right. I had forgotten that sys.exit() is actually >raising the system exit exception, and that the application >calling the library could handle that exception. Well, my point was that exceptions in Python are a bit like a car's check engine light. Few drivers know what this mysterious light means, and aren't prepared to do anything about it when it goes on. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] [EMAIL PROTECTED] -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db // -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Sep 24, 5:22 pm, hrishy <[EMAIL PROTECTED]> wrote: > Well wouldn't it be a lot easier to query and join a xml source with a > relational source with LINQ capabilites in Python. > > Hmm what am i missing here is there a site that takes all LINQ examples and > does them using list comprehensions and makes them sound easy ? > > wasn't python supposed to make everything easy ? Most Python programmers use other languages as well. I have working knowledge of C, Matlab, C++, Java, Fortran 95, and C#. Those that responded to your post know what LINQ are and what LINQ does. Put simply, Python has dynamic typing, list comprehensions, and is scriptable (i.e. Python source is structured text). That's why Python don't need LINQ and XML the same way as C#. LINQ and XML is needed because C# is a statically typed compiled language. That is: LINQ: Python has list comprehensions and dynamic typing (C# do not) XML: Python is structured text (compiled .NET assemblies are not) Second, minimalistic syntax is a virtue. That is why C is still around. Python don't add new syntax sugar every time Redmond invents a new buzzword. Functions like XML processing are delegated to libraries -- where they belong. Nobody was saying LINQ is a bad idea for a language like C#. -- http://mail.python.org/mailman/listinfo/python-list
Re: Making small executive file for distribution
On Wed, Sep 24, 2008 at 10:17 AM, Marin Brkic <[EMAIL PROTECTED]> wrote: > As far as I know py2exe is the only option which can do such a thing > (make exe files from scripts). Is there a way to make those exe files > a little smaller (for a small script they easily go up to 5-10 mb). An alternative solution: Give them a copy of "portable python". It is a Python enviroment that can be used by just copying its file in a single directory (to run python from a pendrive for example), with the need to install any program It even work in Linux with wine (but you seldon need that since most modern Linux distros has a uptodate Python setup). See http://www.portablepython.com/ Best, -- Sebastián Bassi. Diplomado en Ciencia y Tecnología. Vendo isla: http://www.genesdigitales.com/isla What's new in Python 3: http://tinyurl.com/5cd89r Curso Biologia molecular para programadores: http://tinyurl.com/2vv8w6 -- http://mail.python.org/mailman/listinfo/python-list
Re: Python is slow?
I have updated the cookbook entry for yesterday to also include parallel processing for large data sets. Even if you're not interested in kd-trees, it is a good example of what the new multiprocessing standard module can do. There are still people being scared by the GIL, thinking it prevents Python from utilizing multicore processors. http://www.scipy.org/Cookbook/KDTree -- http://mail.python.org/mailman/listinfo/python-list
Re: Making small executive file for distribution
On Wed, 24 Sep 2008 07:32:56 -0700 (PDT), [EMAIL PROTECTED] wrote: >If you don't create a monolithic EXE, then most of the extra files >(that make up the bulk of the size) can be shared between other >converted scripts. That is, if you convert foo.py, and send the bundle >to your colleague, then convert bar.py, you only need to send bar.exe, >and it will run fine if they execute it in the same directory that has >all the DLLs you sent with foo.exe. > >Another option might be to encourage them to download Portable Python, >which doesn't need to be installed. This is an interesting suggestion. I didn't know there was a portable version of python. I will look into it - could just turn out to be the perfect solution to this (after all, it would be even simpler if they could send/receive just .py script). Thank you. -- Marin > >Mark Sherry -- http://mail.python.org/mailman/listinfo/python-list
Re: problem updating variable in a module
[EMAIL PROTECTED] wrote: Hi, I've a problem updating my variable in a module. In my main program, I call a function from mod1 to update a variable of mod1 As soon as I update this varibale, I check it back in the mail program but it the variable from mod1 does not get updated. main Program: import mod1 a = 20 mod.update(a) print mod.a < does not print anything As Tim noted, this cannot run. *** Always post the code you actually ran *** So we cannot answer why the code you did not post did not work. With the mod/mod1 mixup fixed, you do not need the update function. mod.a = 20 should do the same thing. mod1 a = 10 def update(someInt): global a a = someInt print a < this does actually print a = 20 tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Twisted vs. CherryPy vs. ??? for light-weight web servers
On Tue, 23 Sep 2008 21:22:08 -0500, Michael Mabin <[EMAIL PROTECTED]> wrote: Is there any consensus on what the best lightweight web-server is? Or rather would Twisted be a better choice to choose as a framework that allows me to serve html or xml data for light webservices. Or is CherryPy just as good? You haven't described the problem you want to solve in very much detail. I can't tell, for example, why I shouldn't recommend that you use Apache instead of CherryPy or Twisted or anything else. Apache has a huge user community, lots of documentation, and lots of developers fixing its bugs and making it work well. What are you trying to do that would make Apache a bad choice? Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: python syntax for conditional is unfortunate
Asun Friere <[EMAIL PROTECTED]> writes:
> A canonical use of the conditional operator is in
> pluralising words, (eg. '%s dollar' % n + 's' if n!=1 else '').
That fails for n == 1. So what is best?
for i in range(4):
print '%d thing' % i + ('s' if i != 1 else '')
for i in range(4):
print '%d thing%s' % (i, ('s', '')[i==1])
for i in range(4):
print '%d thing%s' % (i, 's' if i != 1 else '')
--
Pete Forman-./\.- Disclaimer: This post is originated
WesternGeco -./\.- by myself and does not represent
[EMAIL PROTECTED]-./\.- the opinion of Schlumberger or
http://petef.22web.net -./\.- WesternGeco.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Comparing float and decimal
Mark Dickinson wrote: On Sep 23, 7:31 pm, Terry Reedy <[EMAIL PROTECTED]> wrote: Decimal is something of an anomaly in Python because it was written to exactly follow an external standard, with no concessions to what would be sensible for Python. It is possible that that standard mandates that Decimals not compare to floats. I don't think the standard says anything about interactions between Decimals and floats. If there is not now, there could be in the future, and the decimal authors are committed to follow the standard wherever it goes. Therefore, the safe course, to avoid possible future deprecations due to doing too much, is to only do what is mandated. But there's certainly been a feeling amongst at least some of the developers that the job of Python's decimal module is to implement the standard and no more, and that extensions to its functionality belong elsewhere. For the reason just stated. A slightly different take is this. The reason for following the standard is so that decimal code in Python is exact interconversion both from and to decimal code in other languages. (And one reason for *that* is that one purpose of the standard is to reliably implement legal and contractual standards for financial calculations.) Using extensions in Python could break/deprecate code translated away from Python. Regarding equality, there's at least one technical issue: the requirement that objects that compare equal hash equal. How do you come up with efficient hash operations for integers, floats, Decimals and Fractions that satisfy this requirement? For integral values, this is no problem. >>> hash(1) == hash(1.0) == hash(decimal.Decimal(1)) == hash(fractions.Fraction(1)) == 1 True For other arithmetic operations: should the sum of a float and a Decimal produce a Decimal or a float? Why? It's not at all clear to me that either of these types is 'higher up' the numerical tower than the other. Floats and fractions have the same issue. Fractions are converted to floats. I can think of two reasons: float operations are faster; floats are my typically thought of as inexact and since the result is likely to be inexact (rounded), float is the more appropriate type to express that. Anyone who disagrees with the choice for their application can explicitly convert the float to a fraction. Decimals can also be converted to floats (they also have a __float__ method). But unlike fractions, the conversion must be explicit, using float(decimal), instead of implicit, as with ints and fractions. Someone *could* write a PyDecimal wrapper that would do implicit conversion and thereby more completely integrate decimals with other Python numbers, but I doubt that saving transitivity of equality will be sufficient motivation ;-). Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Python is slow?
For those who are interested: I've updated the cookbook tutorial on the kd-tree: http://scipy.org/Cookbook/KDTree It now also includes parallel search for multicore CPUs (multiprocessing standard module). Even if you are not genuinely interested in kd-trees, it shows how to do parallel processing in Python despite of the GIL. -- http://mail.python.org/mailman/listinfo/python-list
Re: More regex help
At 2008-09-24T16:25:02Z, "Support Desk" <[EMAIL PROTECTED]> writes:
> I am working on a python webcrawler, that will extract all links from an
> html page, and add them to a queue, The problem I am having is building
> absolute links from relative links, as there are so many different types of
> relative links. If I just append the relative links to the current url, some
> websites will send it into a never-ending loop.
>>> import urllib
>>> urllib.basejoin('http://www.example.com/path/to/deep/page',
'/foo')
'http://www.example.com/foo'
>>> urllib.basejoin('http://www.example.com/path/to/deep/page',
'http://slashdot.org/foo')
'http://slashdot.org/foo'
--
Kirk Strauser
The Day Companies
--
http://mail.python.org/mailman/listinfo/python-list
Re: how to build a MacOS universal python package including external dependencies
2008/9/24 Jaime Huerta Cepas <[EMAIL PROTECTED]>: > Hi all, > > I have developed a set python libraries that provide several scientific > methods to analyse and visualize certain type of biological data. This > libraries are based on many external python modules, such as python-mysql > python-sip or python-qt4. I use GNU/linux to develop my tools and I found no > problems into installing all dependencies, however it does not seem to be > that easy on MacOS. I am sure that all the dependencies (qt4, pyqt4 , > mysqldb, scipy, numpy) are cross platform, but when you are trying to > publish your tool in an academic journal, most referees (many of them using > MacOS) expect some kind of straightforward installation process for the > tool. > > I wonder if there would be a way in which I could compile all the > dependencies and libraries in a MacOs system and then building a static > universal binary that I can distribute. I guess it should be possible, but > I am not sure how difficult it might be, and whether all dependencies (qt4 > is huge) can be packaged together. IMHO this is too complex to commit. Macport is a way to do what you want, but packages may not be up to date enough. Maybe the easiest and simplest way for you to do this is to write a script that will download, compile and install everything. The script should work like: sudo all_in_one_script.py and then wait for jobs to be done. Your script will need to know if a package was sucessfully installed and then continue or take steps and say it. For a complex set of dependencies, I recommend you to write Makefiles. For instance, in pseudo-code: if /usr/local/lib/libfoo.dylib doesn't exist download foo install foo if python-module foo doesn't exist download foo python foo/setup.py install etc HTH Mathieu -- http://mail.python.org/mailman/listinfo/python-list
More regex help
I am working on a python webcrawler, that will extract all links from an html page, and add them to a queue, The problem I am having is building absolute links from relative links, as there are so many different types of relative links. If I just append the relative links to the current url, some websites will send it into a never-ending loop. What I am looking for is a regexp that will extract the root url from any url string I pass to it, such as 'http://example.com/stuff/stuff/morestuff/index.html' Regexp = http:example.com 'http://anotherexample.com/stuff/index.php Regexp = 'http://anotherexample.com/ 'http://example.com/stuff/stuff/ Regext = 'http://example.com' -- http://mail.python.org/mailman/listinfo/python-list
how to build a MacOS universal python package including external dependencies
Hi all, I have developed a set python libraries that provide several scientific methods to analyse and visualize certain type of biological data. This libraries are based on many external python modules, such as python-mysql python-sip or python-qt4. I use GNU/linux to develop my tools and I found no problems into installing all dependencies, however it does not seem to be that easy on MacOS. I am sure that all the dependencies (qt4, pyqt4 , mysqldb, scipy, numpy) are cross platform, but when you are trying to publish your tool in an academic journal, most referees (many of them using MacOS) expect some kind of straightforward installation process for the tool. I wonder if there would be a way in which I could compile all the dependencies and libraries in a MacOs system and then building a static universal binary that I can distribute. I guess it should be possible, but I am not sure how difficult it might be, and whether all dependencies (qt4 is huge) can be packaged together. Any help is more than welcome! Best regards, Jaime. -- http://mail.python.org/mailman/listinfo/python-list
Filthy Pink Sneakers. By Marina Cooper
SEXY story. The cute doorman gives me an enigmatic look when I say I'm here to see you. I am not sure if maybe he thinks I am your daughter. You are not quite old enough for that, I am not quite young enough - but we are pretty close. Am I wrong for thinking that's hot? Definitely. I think... http://ragdai.info/sex-story.html -- http://mail.python.org/mailman/listinfo/python-list
Re: PyRun_SimpleFile() crashes
On Sep 24, 6:30 am, Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > my code:
> > main.cpp
> > #include
>
> > int main(int argc, char **argv)
> > {
> > Py_Initialize();
>
> > FILE *file_1 = fopen("a2l_reader.py","r+");
> > PyRun_SimpleFile(file_1,"a2l_reader.py");
>
> > Py_Finalize();
> > }
>
> > compile under windows using MinGW:
> > g++ main.cpp libpython25.a -o a
>
> > no error was found. But when I run a.exe the program just crashes.
>
> > What should I do?
>
> Run it under gdb (which should have come with MinGW).
>
> Check that you actually opened the file, ie file_1 != 0.
>
> This might be relevant
>
> http://effbot.org/pyfaq/pyrun-simplefile-crashes-on-windows-but-not-o...
>
> --
> Nick Craig-Wood <[EMAIL PROTECTED]> --http://www.craig-wood.com/nick
There's a workaround.
filename = "Entire path of the python file";
PyObject* PyFileObject = PyFile_FromString(filename, "r");
PyRun_SimpleFile(PyFile_AsFile(PyFileObject), filename);
// decref PyFileObject
http://mail.python.org/pipermail/python-list/2007-March/431725.html
http://python-forum.org/pythonforum/viewtopic.php?f=15&t=1554&p=6567
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
On 2008-09-24, Ross Ridge <[EMAIL PROTECTED]> wrote: > Steven D'Aprano <[EMAIL PROTECTED]> wrote: >> Presumably somebody has suggested that calling sys.exit() was a good >> option. I'm curious to what possible reason they could give for such a >> poor choice. > > Grant Edwards <[EMAIL PROTECTED]> wrote: >>Same here. It's like an automotive engine controls designer >>asking if a failed O2 sensor should turn on the check engine >>light or blow up the car. > > No, it's more like asking if the failed sensor should turn on > a strange and mysterious light on the dashboard You're right. I had forgotten that sys.exit() is actually raising the system exit exception, and that the application calling the library could handle that exception. > and then blow up the car if the driver doesn't immediately > stop and check the engine. The owners manual would only > vaguely hint at the fact that this could happen. -- Grant Edwards grante Yow! Why is it that when at you DIE, you can't take visi.comyour HOME ENTERTAINMENT CENTER with you?? -- http://mail.python.org/mailman/listinfo/python-list
Re: problem updating variable in a module
>I take it you do have a *really* good reason to use a global? Please suggest some way other than using global. I want to get rid of it -- Regards, Rajat -- http://mail.python.org/mailman/listinfo/python-list
urllib error on urlopen
Hi,
I have been using the following code for over a year in one of my
programs:
f = urllib2.urlopen('https://www.companywebsite.com/somestring')
It worked great until the middle of the afternoon yesterday. Now I get
the following traceback:
Traceback (most recent call last):
File "", line 1, in
response = urllib2.urlopen(req).read().strip()
File "c:\python25\lib\urllib2.py", line 124, in urlopen
return _opener.open(url, data)
File "c:\python25\lib\urllib2.py", line 381, in open
response = self._open(req, data)
File "c:\python25\lib\urllib2.py", line 399, in _open
'_open', req)
File "c:\python25\lib\urllib2.py", line 360, in _call_chain
result = func(*args)
File "c:\python25\lib\urllib2.py", line 1115, in https_open
return self.do_open(httplib.HTTPSConnection, req)
File "c:\python25\lib\urllib2.py", line 1082, in do_open
raise URLError(err)
URLError:
I tried my Google Fu on this error, but there's not much out there. I
tried using a proxy in Python, but that returned the same traceback.
If I copy the URL into my browser, it resolves correctly. Does anyone
have any advice on how to troubleshoot this error?
I am using Python 2.5.2 on Windows XP.
Thanks,
Mike
--
http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
On Wed, Sep 24, 2008 at 11:25 AM, hrishy <[EMAIL PROTECTED]> wrote: > Hi Tom > > This is what i like and feel of the Python programmers smarter then every > other langauge i know of. > > But i am not comfortable with your second statement XML i never need it > one day everybody would need it. > > > regards > Hrishy > > Well you may be right which is why I said "hopefully" one thing I do know is that in my work in both .net and java, XML plays a more significant role. Everyone can probably speculate differently as to why this is. My personal feeling is that it is because XML is less of a hassle than building/passing around class hierarchies for application state in various scenarios.But in python, it is far easier for me to pass around a dict or some similar structure to get roughly the same effect. So in my mind, XML solves a problem that is present in both .net and java, but not necessarily python. In the same way, linq to xml solves the problem of handling xml in a more convenient way. In order for it to be useful in python, the problem that xml solves would have to be present IMO. That's not to say it's not possible. Someone who needs something like LINQ to XML but in python could write something probably similar to what sqlalchemy does and it would require no changes to the python language or runtime. If it was written then maybe people would invent ways to use XML in python that are better than what other things do. Hooray for the free market of ideas. :) This is all my opinion , I have no idea what the conventional wisdom of the python community is on XML, but in my experience in other languages, it seems to be the answer to a question that no one asked, or the wrong answer, more often than it is the appropriate answer. Maybe it's only that way on OHIO. :) -- Thomas G. Willis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python style: exceptions vs. sys.exit()
Steven D'Aprano <[EMAIL PROTECTED]> wrote: > Presumably somebody has suggested that calling sys.exit() was a good > option. I'm curious to what possible reason they could give for such a > poor choice. Grant Edwards <[EMAIL PROTECTED]> wrote: >Same here. It's like an automotive engine controls designer >asking if a failed O2 sensor should turn on the check engine >light or blow up the car. No, it's more like asking if the failed sensor should turn on a strange and mysterious light on the dashboard and then blow up the car if the driver doesn't immediately stop and check the engine. The owners manual would only vaguely hint at the fact that this could happen. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] [EMAIL PROTECTED] -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db // -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
Hi Tom This is what i like and feel of the Python programmers smarter then every other langauge i know of. But i am not comfortable with your second statement XML i never need it one day everybody would need it. regards Hrishy --- On Tue, 23/9/08, Thomas G. Willis <[EMAIL PROTECTED]> wrote: > From: Thomas G. Willis <[EMAIL PROTECTED]> > Subject: Re: Linq to Python > To: python-list@python.org > Date: Tuesday, 23 September, 2008, 7:45 PM > > But surely the idea behind it will eventually spread. > It's really > > just comprehensions generalized over XML and > relational datasets, a > > noble goal. Besides, it's main purpose for .NET > was to bring > > functional programming to it. Python already has > that, somewhat... > > it's really any object out of the box, i think the sql > linq stuff is > more of a query compiler, IMO sqlalchemy does that. > > > query = select(user_cols, > > and_(table_relationship.c.accept_user_id==user.id, > > table_relationship.c.start_date==None > > ), > > from_obj=join( > > table_relationship,table_user, > > > onclause=table_user.c.id==table_relationship.c.init_user_id > > ).outerjoin(table_profile) > > ) > > session.execute(query).fetchall() > > > > > > > XML? meh hopefully I would never need it. :) > > > C# is my day job, and when I got my hands on LINQ back in > January my > initial thought was "Finally I have list > comprehensions day job is > fun again" > > For the most part, I think C# is catching up. > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: problem updating variable in a module
Thanks Tim, Yes, I mean 'mod' only. But this does not work for me On Wed, Sep 24, 2008 at 4:19 PM, Tim Rowe <[EMAIL PROTECTED]> wrote: > 2008/9/24 <[EMAIL PROTECTED]>: > > Hi, > > > > I've a problem updating my variable in a module. > > > > In my main program, I call a function from mod1 to update a variable of > mod1 > > As soon as I update this varibale, I check it back in the mail program > but > > it the variable from mod1 does not get updated. > > > > main Program: > > > > import mod1 > > a = 20 > > mod.update(a) > > print mod.a < does not print anything > > > > mod1 > > > > a = 10 > > def update(someInt): > > global a > > a = someInt > > print a < this does actually print a = 20 > > I'm surprised it runs at all -- as far as I can see "mod" in > "mod.update(a)" and "print mod.a" is not defined. Did you mean "mod1"? > If I change it to that, both print statements print "20" as I'd > expect. > > I take it you do have a *really* good reason to use a global? > > -- > Tim Rowe > -- > http://mail.python.org/mailman/listinfo/python-list > -- Regrads, Rajat -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
Hi Well wouldn't it be a lot easier to query and join a xml source with a relational source with LINQ capabilites in Python. Hmm what am i missing here is there a site that takes all LINQ examples and does them using list comprehensions and makes them sound easy ? wasn't python supposed to make everything easy ? regards Hrishy --- On Tue, 23/9/08, sturlamolden <[EMAIL PROTECTED]> wrote: > From: sturlamolden <[EMAIL PROTECTED]> > Subject: Re: Linq to Python > To: python-list@python.org > Date: Tuesday, 23 September, 2008, 7:49 PM > On Sep 23, 4:48 pm, hrishy <[EMAIL PROTECTED]> > wrote: > > > Will LINQ be ported to Python ? > > No, because Python already has list comprehensions and we > don't need > the XML buzzword. > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Linq to Python
Hi Terry Oops i never realised the mistake i have commited I apologise (i thought changing the subject line would make a new thread) I apologise (I thought Python programmers were smart and they did know what LINQ was) I don't apologise ( i dont apologise for the third one not sounding cocky here but i did google but nothing much came up thats when i posted the question here since i always see Python programmers are somehow smarter then programmers in other langauges i don't know if its the language or the programmers themselves that make them smart) regards Hrishy --- On Tue, 23/9/08, Terry Reedy <[EMAIL PROTECTED]> wrote: > From: Terry Reedy <[EMAIL PROTECTED]> > Subject: Re: Linq to Python > To: python-list@python.org > Date: Tuesday, 23 September, 2008, 7:51 PM > > Will LINQ be ported to Python ? > > I have three suggestions: > > 1. When starting a new thread, start a *new* thread. > Don't tack a new, > unrelated subject onto an existing thread. Your post will > not be seen > by people with readers that collapse thread and who do not > happen to > read the 'Python is slow?' thread. > > 2. Also, give enough informaton that people can understand > your question > without searching the web and guessing. In particular, > that do *you* > mean by LINQ? The game? The .NET component? Or something > else? > > 3. Before posting, search the Python manuals or the web a > bit for an > answer. If you mean the .NET component, googling > 'Python LINQ' should > partly answer your question. > > tjr > > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
