Import Issue
Hi all, I am facing a problem while importing a file in python script. After doing import file i am updating that file. Later i am accessing a dictionary contained in that file. Eventhough changes are reflected in the file... When i access a dictionary those changes are not there. I believe that it is accessing from the object file that is created when i did import at the start of the script. I will be kind enough if somebody suggest solution to this problem. Regards- praveen -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
Jim Segrave wrote: > In article <[EMAIL PROTECTED]>, > Paddy <[EMAIL PROTECTED]> wrote: > > > >What I ran was more like the version below, but i did a quick > >separation of the line that has the ';' in it and goofed. > > > def interv2(inlist): > >... for i,val in enumerate(inlist): > >... if i==0: > >... tmp = val > >... elif val != valinc: > >... yield [tmp, valinc]; tmp = val > >... valinc = val+1 > >... yield [tmp, valinc] > >... > list(interv2(inlist)) > >[[3, 4], [6, 9], [12, 14], [15, 16]] > > Fails on an empty list, as tmp is not defined when it hits the yield > > > -- > Jim Segrave ([EMAIL PROTECTED]) Yep, I still, purposfully, decided not to put any guard checks in because: Its very easy to add. It detracts from the algorithm. It might never be called with an empty list in-situ. It is correct for the original posters testcases. Yah gotta leave-em something to do ;-) But you-too are right. Don't just cut-n-paste newsgroup solutions. they need testing for your particular use. I doubt anyone on C.L.P. would be malicious, but your actual use of a function having a wider scope to inputs than mentioned might be fairy common. (Damn, I wanted to use 'caveat emptor', but it does not apply as nothing is being bought. Oh well :-) -- Pad. -- http://mail.python.org/mailman/listinfo/python-list
Re: Are there something like "Effective Python"?
>> I just finished reading Learning Python 3rd ed, For real? I thought there was only a 2nd edition. http://www.oreilly.com/catalog/lpython2/ -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
Hi! > There are thousands of threads to choose from in this forum. > If they didn't like this question, they could have picked any other one > to discuss. > There's no need to be disagreeable :-) I think the same thing. -- @-salutations Michel Claveau -- http://mail.python.org/mailman/listinfo/python-list
Re: Are there something like "Effective Python"?
I think Aahz stated somewhere that he was workign on Effective Python. I'm not sure if it's an ongoing plan or it's been canned though? Mike Meng wrote: > Hi all, > I just finished reading Learning Python 3rd ed, and am doing my > first Python application, which retrieves and process text and XML > documents from Web. Python helped me to write the application in a few > hours, I'm very happy with its productivity. But the performance is not > satisfactory. I decide to optimized it in Python before trying C/C++ > extensions. But I don't know Python much and have no clu to tune my > program. Also, I don't know what Pythonist's preferred styles. Are > there any books/documents which play the similar role for Python as > 'Effective C++' does for C++? > > For example, one of my friends read my program and suggest me to > move the re.compile() out of a for-loop, since the regular pattern is > fixed, and re.compile() is slow. I want to find more such advice, where > can I find them? > > Thank you. > > Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: image lib & Qt4
Fredrik Lundh wrote:
> To get better performance, you should be able to use PIL's tostring()
> method together with the QImage(buffer, width, height, depth,
> colortable, numColors, bitOrder) form of the QImage constructor.
for PyQt4, that seems to have changed to QImage(buffer, width, height,
format), where format is a QImage.Format_XXX specifier.
in other words, this should work:
if im.mode != "RGB":
im = im.convert("RGB")
data = im.tostring("raw", "BGRX")
image = QImage(data, im.size[0], im.size[1],
QImage.Format_RGB32)
note that the QImage descriptor will point into the data buffer, so you
must hang on to data for as long you're using image.
(I haven't found a way to attach a user attribute to a QImage class; it
doesn't complain when I do that, but it doesn't seem to do the right
thing...)
--
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Re: grouping a flat list of number by range
Gerard Flanagan wrote: > [EMAIL PROTECTED] wrote: > > hello, > > > > i'm looking for a way to have a list of number grouped by consecutive > > interval, after a search, for example : > > > > [3, 6, 7, 8, 12, 13, 15] > > > > => > > > > [[3, 4], [6,9], [12, 14], [15, 16]] > > > > (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => > > [6:9], and so on) > > > > i was able to to it without generators/yield but i think it could be > > better with them, may be do you an idea? > > > > best regards, > > > > a list comprehension/itertools version (this won't work with an empty > list): > > from itertools import groupby > > a = [3, 6, 7, 8, 12, 13, 15] > > result = [[3, 4], [6,9], [12, 14], [15, 16]] > > b = [ list(g)[0] for k,g in groupby(range(a[0],a[-1]+2), lambda x: > x in a)] > > c = [ b[i:i+2] for i in range(0,len(a),2) ] > > assert c == result > > > Gerard change len(a) to len(b) in case a has duplicates like [3,3,3,6,7,8,12,13,15] Gerard -- http://mail.python.org/mailman/listinfo/python-list
Re: Are there something like "Effective Python"?
Mike Meng wrote: > Hi all, > I just finished reading Learning Python 3rd ed, and am doing my > first Python application, which retrieves and process text and XML > documents from Web. Python helped me to write the application in a few > hours, I'm very happy with its productivity. But the performance is not > satisfactory. I decide to optimized it in Python before trying C/C++ > extensions. But I don't know Python much and have no clu to tune my > program. Also, I don't know what Pythonist's preferred styles. Are > there any books/documents which play the similar role for Python as > 'Effective C++' does for C++? > > For example, one of my friends read my program and suggest me to > move the re.compile() out of a for-loop, since the regular pattern is > fixed, and re.compile() is slow. I want to find more such advice, where > can I find them? > > Thank you. > > Mike http://wiki.python.org/moin/PythonSpeed/PerformanceTips Also, I suggest checking Psyco ( http://psyco.sourceforge.net/ ), which can easily improve your program's speed with no change in your code. Hope this helps... Luis -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
[EMAIL PROTECTED] wrote: > hello, > > i'm looking for a way to have a list of number grouped by consecutive > interval, after a search, for example : > > [3, 6, 7, 8, 12, 13, 15] > > => > > [[3, 4], [6,9], [12, 14], [15, 16]] > > (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => > [6:9], and so on) > > i was able to to it without generators/yield but i think it could be > better with them, may be do you an idea? > > best regards, > a list comprehension/itertools version (this won't work with an empty list): from itertools import groupby a = [3, 6, 7, 8, 12, 13, 15] result = [[3, 4], [6,9], [12, 14], [15, 16]] b = [ list(g)[0] for k,g in groupby(range(a[0],a[-1]+2), lambda x: x in a)] c = [ b[i:i+2] for i in range(0,len(a),2) ] assert c == result Gerard -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
Erik Max Francis wrote: > Yeah, what jerks. They actually wanted to talk about Python, not some > random other language that you're trying to learn that has nothing to do > with it ... There are thousands of threads to choose from in this forum. If they didn't like this question, they could have picked any other one to discuss. There's no need to be disagreeable :-) Luis -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance structure less important in dynamic languages?
"Marvin" <[EMAIL PROTECTED]> writes:
> It's been claimed that inheritance structures are less important in
> dynamic languages like Python.
Who claimed that? I ask not because I doubt your assertion ("it was
claimed"), but rather that if someone claimed something, it seems
better to ask that person your next question:
> Why is that and where can i read more about that?
The person who claimed it is more likely to be able and willing to
defend it.
--
\ Eccles: "I just saw the Earth through the clouds!" Lew: "Did |
`\ it look round?" Eccles: "Yes, but I don't think it saw me." |
_o__) -- The Goon Show, _Wings Over Dagenham_ |
Ben Finney
--
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Re: C# equivalent to range()
Neuruss wrote: > I thougt that maybe some python programmer could have experience here > with c# and give me a little hint. > > But unfortunately, there are people here who are not willing to waste > their time helping, but enjoy to waste their time niggling... Yeah, what jerks. They actually wanted to talk about Python, not some random other language that you're trying to learn that has nothing to do with it ... -- Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/ San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis A man can stand a lot as long as he can stand himself. -- Axel Munthe -- http://mail.python.org/mailman/listinfo/python-list
Are there something like "Effective Python"?
Hi all, I just finished reading Learning Python 3rd ed, and am doing my first Python application, which retrieves and process text and XML documents from Web. Python helped me to write the application in a few hours, I'm very happy with its productivity. But the performance is not satisfactory. I decide to optimized it in Python before trying C/C++ extensions. But I don't know Python much and have no clu to tune my program. Also, I don't know what Pythonist's preferred styles. Are there any books/documents which play the similar role for Python as 'Effective C++' does for C++? For example, one of my friends read my program and suggest me to move the re.compile() out of a for-loop, since the regular pattern is fixed, and re.compile() is slow. I want to find more such advice, where can I find them? Thank you. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: image lib & Qt4
aljosa wrote: > does anybody know how to load (in-memory > representation of PNG image) from Qt (v.4.1.3) as QImage? If you want the data from a StringIO object, you can either *read* the data from the object (it's a file-like object, after all), or use the getvalue() method. Something like qim = QImage() qim.loadFromData(f.getvalue()) should work (unless they've changed things around lately). To get better performance, you should be able to use PIL's tostring() method together with the QImage(buffer, width, height, depth, colortable, numColors, bitOrder) form of the QImage constructor. -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Python: Do we have the concept of Hash in Python?
Well the work is done now. I arrived home at 10:30 PM. The application takes data from Oracle 10g stored procedures and renders data to both HTML and CSV formats. The HTML reports have summary and grouping sections and the HTML files are Excel friendly. The application is modular and consists of reusable modules. The application is called every night by scheduled task. The CSV and HTML files are being deployed to Apache for internal employee access. This isn't a complex and big system. Tomorrow, I'll add the email functionality to the application and re-use it's components for more reports. Now that I finished the 1st part of the application, I have to admit that choosing Python was an excellent decision. Python is an awesome programming language with comprehensive library and great community support. I am not that new to Python anymore.. I had a productive day. Thanks everybody for help. "gregarican" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Dear A.M., > > The day is complete. My TPS reports still aren't on my desk. Either > with or without cover sheets. Not a good time to try to teach yourself > a new language. Please gather your belongings and move down to basement > storage C. > > That'd be great, > Bill Lumberg > > John Machin wrote: >> A.M wrote: >> >> > The application is not mission critical system. It is just a simple >> > reporting tool. >> >> Famous last words. > -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python format long integer 123456789 to 12,3456,789 ?
A.M wrote:
> Hi,
>
> Is there any built in feature in Python that can format long integer
> 123456789 to 12,3456,789 ?
Apparently you need to use the locale module. This is the
example they give online to print a simple number with commas:
import locale
locale.setlocale(locale.LC_ALL, 'English_United States.1252')
print locale.format("%d", 123456789, grouping=True)
Someone should make a module that uses .NET or Java's formmating.
You just use {0:n} or ###,### instead of all the above.
http://blog.stevex.net/index.php/string-formatting-in-csharp/
http://java.sun.com/docs/books/tutorial/i18n/format/decimalFormat.html
--
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Re: C# equivalent to range()
Neuruss wrote: > John Machin wrote: > > Neuruss wrote: > > > I'm sorry for asking about another language here, but since I only know > > > Python and I'm trying to write something in C#, I guess this is the > > > best place... > > > > > > > Bad guess. Ask questions about language X on comp.lang.X > > Well, perhaps I should. > And I should also explain how range and extend work in python, which is > almost the same thing... > > I thougt that maybe some python programmer could have experience here > with c# and give me a little hint. > > But unfortunately, there are people here who are not willing to waste > their time helping, but enjoy to waste their time niggling... > Plonk. -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
Thank you DH!!
D H wrote:
> Neuruss wrote:
> > I'm sorry for asking about another language here, but since I only know
> > Python and I'm trying to write something in C#, I guess this is the
> > best place...
> >
> > I'd like to know how to write this in C#:
> >
> > x=[]
> > sz = 1000
> > x.extend(range(sz))
> >
> > My question is about "range" and "extend". Is there any equivalent in
> > C#?
> >
> > Thanks in advance,
> > Neuruss
> >
>
> List mylist = new List();
> for (int i=0; i<1000; i++)
> {
> mylist.Add(i);
> }
>
> You can use AddRange, C# 2.0 anonymous delegates, IEnumerable, yield,
> foreach, and so forth instead, but for your example this is simplest.
>
> Another option is to use boo. http://boo.codehaus.org/
> It uses python's syntax but is as fast as C#. The only change you'd
> have to make in that code is to capitalize the Extend method call.
--
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Re: C# equivalent to range()
John Machin wrote: > Neuruss wrote: > > I'm sorry for asking about another language here, but since I only know > > Python and I'm trying to write something in C#, I guess this is the > > best place... > > > > Bad guess. Ask questions about language X on comp.lang.X Well, perhaps I should. And I should also explain how range and extend work in python, which is almost the same thing... I thougt that maybe some python programmer could have experience here with c# and give me a little hint. But unfortunately, there are people here who are not willing to waste their time helping, but enjoy to waste their time niggling... Thanks anyway! Neuruss -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
Neuruss wrote:
> I'm sorry for asking about another language here, but since I only know
> Python and I'm trying to write something in C#, I guess this is the
> best place...
>
> I'd like to know how to write this in C#:
>
> x=[]
> sz = 1000
> x.extend(range(sz))
>
> My question is about "range" and "extend". Is there any equivalent in
> C#?
>
> Thanks in advance,
> Neuruss
>
List mylist = new List();
for (int i=0; i<1000; i++)
{
mylist.Add(i);
}
You can use AddRange, C# 2.0 anonymous delegates, IEnumerable, yield,
foreach, and so forth instead, but for your example this is simplest.
Another option is to use boo. http://boo.codehaus.org/
It uses python's syntax but is as fast as C#. The only change you'd
have to make in that code is to capitalize the Extend method call.
--
http://mail.python.org/mailman/listinfo/python-list
Re: is a wiki engine based on a cvs/svn a good idea?
TWiki, written in perl, makes extensive use of versioning/diff functionality you mention through the use of RCS, which, IIRC, is the basis for CVS. This method eliminates the need for the repository as such, and merely requires the presence of the RCS files (and RCS). Unless you _want_ to host your data on a separate machine than the one hosting the wiki, you might consider RCS as an alternative to CVS. OTOH, it is clearly a good idea to base your software on such a tool, given that TWiki does it and has proven to be quite successful. =) Rick piotr malin'ski wrote: > I'm planning to wite a fully featured wiki in Python in one of > frameworks. I've seen some notes about wiki/documentation management > scripts that use SVN as a data storage/versioning. > I've been using SVN a bit but I don't know if it's a good idea to use > it in a wiki engine. Pro: versioning / diffs, Cons: you need your own > svn/cvs repository, can pyLucene or Xapwrap index this? -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
"Neuruss" <[EMAIL PROTECTED]> writes: > I'm sorry for asking about another language here, but since I only > know Python and I'm trying to write something in C#, I guess this is > the best place... Really, it isn't. Post in a C# discussion forum, describing the behaviour you want from your program. -- \ "The only tyrant I accept in this world is the still voice | `\ within." -- Mahatma Gandhi | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
Slawomir Nowaczyk <[EMAIL PROTECTED]> wrote:
> On Thu, 01 Jun 2006 15:12:23 -0700
> [EMAIL PROTECTED] wrote:
>
> #> I believe that 'is' tests equality of reference, such that
> #>
> #> >>> a = range(1,3)
> #> >>> b = range(1,3)
> #> >>> a is b
> #> False
> #>
> #> The 'is' operator tells you whether a and b refer to the same object.
> #> What I've been discussing is whether == should test for "structural"
> #> equality so that a and b remain equivalent under parallel mutations
> #> (and also under single mutations to common references)
>
> What does "parallel mutations" mean? In particular, what should be the
> results of each of the following three comparisons:
>
> x, y, z = [1],[1],[1]
> a, b = [x,y], [y,z]
> c, d = [[1],[1]], [[1],[1]]
> a == b
> c == d
> a[0].remove(1)
> b[0].remove(1)
> a == b
>
> So, do I understand correctly that you would like first comparison
> (a==b) to return "False" and second comparison (c==d) to return
> "True"?
I sure hope not, since, e.g.:
ridiculous = c[0]
is not a "mutation" (so equality should still hold, right?), and then it
becomes weird to claim that
ridiculous.append('bah, humbug!')
is a "nonparallel mutation to" c and/or d.
In fact, I'm starting to wonder if by Michaels' requirement ANY
non-*IDENTICAL* containers (with non-identical mutable items) could EVER
be deemed "equal". If he's arguing that "==" should mean exactly the
same as "is", that's even crazier than I had gauged so far.
But of course, since Michaels still refuses to provide simple,
straightforward operational definitions of what it IS that he wants, all
of this remains vague and ill-defined. See *WHY* it's so important to
provide precision rather than just the handwaving he's given so far?
Alex
--
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Re: An oddity in list comparison and element assignment
Slawomir Nowaczyk <[EMAIL PROTECTED]> wrote: > On Thu, 01 Jun 2006 13:40:34 -0700 > [EMAIL PROTECTED] wrote: > > #> Scott David Daniels wrote: > #> > Would you say that envelope containing five $100 bills is equal to > #> > an envelope containing five $100 bills with different serial numbers? > > #> Yes (unless I was testing the assertion that the second envelope did > #> not contain counterfeits of the first) > > So, what if Bank of America later decided that bills with serial > numbers containing "7" are no longer valid? Then Wachowia would no doubt be happy to take my business away from BoA;-). I suspect you believe BoA is some kind of "official" body -- it isn't, just like Deutschebank is not one in Germany (rather, Bundesbank is). Just to share some tidbits (about which, as an Italian now living between San Francisco and San Jose, I'm sort of proud of...!-)...: Bank of America is a private bank, founded in San Francisco more than 100 years ago by an Italian-American guy (Amadeo Giannini, born in San Jose, CA, but to Italian-born parents) as "Bank of Italy", then renamed in 1930 in part because the Italian State bank "Banca d'Italia" objected. It rose to prominence right after the SF earthquake of 100 years ago, by opening and staffing a temporary branch to ensure depositors could access their money when they most needed it, while most other banks were staying closed. > In other word, *if* you assume equality must be preserved by future > modifications, than no two different (modifiable) objects can ever be > really equal. Yes, apart from the (slight and understandable!) mistake about BoA's role, this is an excellent example. Here, a global change (to the rule about what banknotes are "equal" to each other, by making some of them invalid and thus unequal to others) perturbs Michaels' desired "strong equality definition" -- to preserve it, equality must degenerate to identity. A Python example would be a change to the default encoding (not officially supported but achievable through a reload(sys), hint;-) which could easily make a bytestring equal, or not, to a Unicode string! Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
<[EMAIL PROTECTED]> wrote: ... > I agree with Alex that checking for this type of inequality is not a > trivial programming exercise. It requires (at least) a parallel I'm not asking for ANY programming: I'm asking for a *straightforward operational definition*. If the concept which you hanker after is NOT subject to a straightforward operational definition, then I would rule out that said concept could POSSIBLY be "natural". > Alternatively, it might make sense to disallow == for containers by > raising a TypeError although that would eliminate a largely useful > feature. This may be the best example I've ever seen of Emerson's well-known quote about foolish consistency -- except that I don't think this behavior would be "consistent" (either wisely or foolishly) with anything except a vague handwaving set of constraints whose "naturalness" (assuming it's unfeasible to provide a good and straightforward operational definition) is out of the question. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
<[EMAIL PROTECTED]> wrote: > Hi Alex, > With all due respect to your well-deserved standing in the Python > community, I'm not convinced that equality shouldn't imply invariance > under identical operations. So, why aren't you satisfying my request? Provide a simple concrete definition of what your idea of equality WOULD behave like. I notice that your lack of response stands out like a sore thumb -- all you're providing is a set of constraints you desire and a collection of illfounded analogies and handwaving. Traditional mathematics does not support the concept of "change", nor the distinction between equality and identity; the "real world" has no way to define what modifications are "identical" except by their effects (if the results differ, either the original equality was ill-posited or the modifications were not "identical"). But the real world DOES have the concept of "performing exactly the same sequence of operational steps", and, by THAT definition of "equal modifications", then your assertion: > make identical modifications to the engines of two identical > automobiles, I expect the difference in performance to be identical. is ill-founded -- or, rather, your *expectation* may be ill-founded. Take two systems of any significant complexity that are similar enough to be called "identical" by ALL observers (because trying to ascertain the differences, if any, would inevitably perturb the systems irretrievably by Heisenberg's effect -- i.e., there are no OBSERVABLE differences, which by Occam's Razor requires you to posit the systems are equal, because you cannot prove otherwise -- and entities must not be multiplied beyond necessity, so supposing that "observably equal" systems are indeed equal is Occam-compliant). Now, perform "identical" (ditto) modifications: in the real world, due to quantum effects, there WILL be sub-observable differences in what you're doing to the first one and to the second one. If the systems are unstable to start with, they may well amplify those differences to observable proportions -- and there you are: the effect of the "equal" change on "equal" system may easily become observably unequal. Philosophically, you may classify this as an "observation" of both systems, which reasoning backwards lead you to posit that either the systems were NOT equal to start with or the modifications weren't... that is, IF you also posit determinism, which, as well we know, is an unwarrantedly strong hypothesis for systems in which the differences at quantum level matter. Feel free to follow Einstein (and diverse light-years away from the last few decades of physics) in positing that there MUST exist "hidden variables" (unobservable except maybe in destructive, irreversible ways) explaining the difference -- I'll stick with the mainstream of physics and claim your expectation was badly founded to start with. I can debate epistemology with the best, but this is not really the proper forum for this -- starting with the crucial distinction, what it means, in mathematics OR in the real world, to state that two systems are "equal but NOT identical"? In the end, such debates tend to prove rather futile and unproductive, however. In the world of programming languages, we cut through the chase by requesting *operational* (Brouwer-ian, mathematically speaking) definitions. Provide the *operational* definition of how you WANT equality checking to work, contrast it with my simple two-lines one, and THEN we can have a meaningful debate of which one is the correct one to use in the core of a programming language that has the (blessing and curse of) mutable data objects... Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Best Python Editor
Fredrik Lundh wrote: > "Manoj Kumar P" wrote: > > Can anyone tell me a good python editor/IDE? > emacs! [...] Fredrik Lundh wrote: > "Manoj Kumar P" wrote: > > Can anyone tell me a good python editor/IDE? > vim! There is much truth in this man's replies. ;-D Cheers, Terry -- Terry Hancock ([EMAIL PROTECTED]) Anansi Spaceworks http://www.AnansiSpaceworks.com -- http://mail.python.org/mailman/listinfo/python-list
Re: C# equivalent to range()
Neuruss wrote: > I'm sorry for asking about another language here, but since I only know > Python and I'm trying to write something in C#, I guess this is the > best place... > Bad guess. Ask questions about language X on comp.lang.X -- http://mail.python.org/mailman/listinfo/python-list
C# equivalent to range()
I'm sorry for asking about another language here, but since I only know Python and I'm trying to write something in C#, I guess this is the best place... I'd like to know how to write this in C#: x=[] sz = 1000 x.extend(range(sz)) My question is about "range" and "extend". Is there any equivalent in C#? Thanks in advance, Neuruss -- http://mail.python.org/mailman/listinfo/python-list
Inheritance structure less important in dynamic languages?
Hi, It's been claimed that inheritance structures are less important in dynamic languages like Python. Why is that and where can i read more about that? /Marv -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Python: Do we have the concept of Hash in Python?
Dear A.M., The day is complete. My TPS reports still aren't on my desk. Either with or without cover sheets. Not a good time to try to teach yourself a new language. Please gather your belongings and move down to basement storage C. That'd be great, Bill Lumberg John Machin wrote: > A.M wrote: > > > The application is not mission critical system. It is just a simple > > reporting tool. > > Famous last words. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python format long integer 123456789 to 12,3456,789 ?
Thanks for help. Is there any comprehensive library for number formatting available on the net? Alan -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter - changing existing Dialog?
In article <[EMAIL PROTECTED]>, Michael Yanowitz <[EMAIL PROTECTED]> wrote: . . . >2) Change the text of a label or button that is already drawn? > > based on actions taken by the user. Can it be done without destroying >the present dialog or the objects in it and creating a new one? . . . import Tkinter root = Tkinter.Tk() counter = 0 # This is one of several ways one can access the Button's label. def set_text(): b.configure(text = "The button has been pushed %d time(s)." % counter) def actions(): global counter counter += 1 set_text() b = Tkinter.Button(root, command = actions) set_text() b.pack() root.mainloop() -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter - changing existing Dialog?
In article <[EMAIL PROTECTED]>, Michael Yanowitz <[EMAIL PROTECTED]> wrote: >Hello: > > > I have a Tkinter GUI Dialog with many buttons and labels and text >widgets. >What I would like to do is, can I: > >1) Disable/deactivate/hide a button, text widget that is already drawn (and > of course the opposite enable/activate/show it)? . . . import Tkinter root = Tkinter.Tk() def actions(): print "Someone pushed the button." b.configure(state = Tkinter.DISABLED) b = Tkinter.Button(root, text = "Push me", command = actions) b.pack() root.mainloop() -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python format long integer 123456789 to 12,3456,789 ?
[EMAIL PROTECTED] wrote:
> A.M wrote:
> > Hi,
> >
> > Is there any built in feature in Python that can format long integer
> > 123456789 to 12,3456,789 ?
> >
> > Thank you,
> > Alan
>
> I did this for putting commas into monetary amounts (thus the .2f):
>
> def commas(value):
> return "".join(commafy("%.2f" % value))
>
> def commafy(s):
> pieces = s.split(".")
> l = len(pieces[0])
> for i in range(0,l):
> if (l - i) % 3 or not i:
> yield pieces[0][i]
> else:
> yield ","
> yield pieces[0][i]
> if len(pieces) > 1:
> yield "." + pieces[1]
>
I dips me lid -- that's far fuglier than mine!!!
--
http://mail.python.org/mailman/listinfo/python-list
Re: execfile then import back
> ## x.py and y.py (they are identical) ## > import testexec > print "1:", v, testexec.v > testexec.v = 7 Oops, testexec should be changed to t instead. That is: ## x.py and y.py (they are identical) ## import t print "1:", v, t.v t.v = 7 -- http://mail.python.org/mailman/listinfo/python-list
execfile then import back
I am seeing something strange with execfile. I've simplified the code
to:
## t.py ##
print "here"
v = None
def f():
global v
v = 6
if __name__ == "__main__":
f()
print "0:", v
execfile("x.py")
print "0:", v
execfile("y.py")
print "0:", v
## x.py and y.py (they are identical) ##
import testexec
print "1:", v, testexec.v
testexec.v = 7
Runing "python t.py" (with Python 2.4.2), the printout I got is:
here
0: 6
here
1: 6 None
0: 6
1: 6 7
0: 6
So there is apparently 2 different instances of v at run time. Can
someone please explain (1) why this is the case, and (2) assuming this
is correct behavior, how I can avoid this? Thanks.
--
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Re: Can Python format long integer 123456789 to 12,3456,789 ?
John Machin wrote: > A.M wrote: > > Hi, > > > > Is there any built in feature in Python that can format long integer > > 123456789 to 12,3456,789 ? > > > > Sorry about my previous post. It would produce 123,456,789. > "12,3456,789" is weird -- whose idea PHB or yours?? If it's not a typo, it's probably a regional thing. See, e.g., http://en.wikipedia.org/wiki/Indian_numbering_system --Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python format long integer 123456789 to 12,3456,789 ?
A.M wrote:
> Hi,
>
> Is there any built in feature in Python that can format long integer
> 123456789 to 12,3456,789 ?
>
> Thank you,
> Alan
I did this for putting commas into monetary amounts (thus the .2f):
def commas(value):
return "".join(commafy("%.2f" % value))
def commafy(s):
pieces = s.split(".")
l = len(pieces[0])
for i in range(0,l):
if (l - i) % 3 or not i:
yield pieces[0][i]
else:
yield ","
yield pieces[0][i]
if len(pieces) > 1:
yield "." + pieces[1]
jtm
--
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Re: Can Python format long integer 123456789 to 12,3456,789 ?
A.M wrote:
> Is there any built in feature in Python that can format long integer
> 123456789 to 12,3456,789 ?
The locale module can help you here:
>>> import locale
>>> locale.setlocale(locale.LC_ALL, '')
'English_United States.1252'
>>> locale.format('%d', 123456789, True)
'123,456,789'
Be sure to read the caveats for setlocale in the module docs:
http://docs.python.org/lib/node323.html
I'd recommend calling setlocale only once, and always at the start of
your program.
--Ben
--
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Re: Can Python format long integer 123456789 to 12,3456,789 ?
A.M wrote: > Hi, > > Is there any built in feature in Python that can format long integer > 123456789 to 12,3456,789 ? > Sorry about my previous post. It would produce 123,456,789. "12,3456,789" is weird -- whose idea PHB or yours?? -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Python: Do we have the concept of Hash in Python?
A.M wrote: > The application is not mission critical system. It is just a simple > reporting tool. Famous last words. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python format long integer 123456789 to 12,3456,789 ?
On 2/06/2006 9:08 AM, A.M wrote:
> Hi,
>
> Is there any built in feature in Python that can format long integer
> 123456789 to 12,3456,789 ?
>
> Thank you,
> Alan
Not that I know of, but this little kludge may help:
8<---
import re
subber = re.compile(r'^(-?\d+)(\d{3})').sub
def fmt_thousands(amt, sep):
if amt in ('', '-'):
return ''
repl = r'\1' + sep + r'\2'
while True:
new_amt = subber(repl, amt)
if new_amt == amt:
return amt
amt = new_amt
if __name__ == "__main__":
for prefix in ['', '-']:
for k in range(11):
arg = prefix + "1234567890.1234"[k:]
print "<%s> <%s>" % (arg, fmt_thousands(arg, ","))
8<---
HTH,
John
--
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Re: Recommendations for CD/DVD-based or on-line Python classes?
Joel Kolstad wrote: > Just curious... I have plenty of programming background (C++ being the > closest > to Python), and I have a copy of Lutz's "Learning Python," but before I dive > head-first into that tome, does anyone know of a web-based or CD/DVD-based > training class that's priced for individuals? > > Example of what I'm looking for: Something like 6 or 7 years ago Ziff-Davis > had a bunch of on-line instructor-lead courses, where you'd read a chapter in > a book, read the instructor's take on the chapter (just a few pages), perform > the programming assignments, and ask the instructor if you had any > difficulties. There was a solid schedule (ch. 1 this week, ch. 2 the next, > etc. -- courses repeated every quarter or somesuch) as well. Ziff-Davis > charged something like $99 or $199/year for this service (all the courses you > wanted to sign up for -- quite reasonable, IMO) and also made money by > requiring the use of their own books (which were often someone else's book > that they'd just put their own name on) -- which were usually cheap enough at > something like $30/ea. > > That whole setup worked quite well for me... anyone know of something > similar? > If not I probably will have to force myself to spend an hour a day or > something going through Lutz's book... > > Thanks, > ---Joel Kolstad > > Well, you could read through all the web thingies around (the online tutorial is great), many others listed "getting started" should help, and to really build your muscles, try the "Python challenge." -- --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
On 2/06/2006 8:36 AM, Paddy wrote: > [EMAIL PROTECTED] wrote: >> hello, >> >> i'm looking for a way to have a list of number grouped by consecutive >> interval, after a search, for example : >> >> [3, 6, 7, 8, 12, 13, 15] >> >> => >> >> [[3, 4], [6,9], [12, 14], [15, 16]] >> >> (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => >> [6:9], and so on) >> >> i was able to to it without generators/yield but i think it could be >> better with them, may be do you an idea? >> >> best regards, >> >> J. > > I did a proceedural version, then re-read your post and did a generator > based version ;-) > > === interv1 === inlist = [3, 6, 7, 8, 12, 13, 15] tmp = [] for i,val in enumerate(inlist): > ... if i==0: > ... tmp.append(val) > ... elif val != valinc: > ... tmp += [valinc, val] > ... valinc = val+1 > ... tmp.append(valinc) tmp > [3, 4, 6, 9, 12, 14, 15, 16] tmp[0::2] > [3, 6, 12, 15] tmp[1::2] > [4, 9, 14, 16] zip(tmp[0::2], tmp[1::2]) > [(3, 4), (6, 9), (12, 14), (15, 16)] > > === END interv1 === > > === interv2 === def interv2(inlist): > ... for i,val in enumerate(inlist): > ... if i==0: > ... tmp = val > ... elif val != valinc: > ... yield [tmp, valinc] > ... tmp = val > ... valinc = val+1 > ... yield [tmp, valinc] > ... list(interv2(inlist)) > [[3, 4], [6, 9], [12, 14], [15, 16]] > > === END interv2 === > > - Paddy. > Oh the siren call of every new feature in the language! enumerate() just to get a first-time test, and then botch it?? Read the following; the replacement version uses a simple old-fashioned inelegant flag, works with an empty sequence, and doesn't depend on the input being sliceable or indexable. HTH, John C:\junk>type interval.py def interv2(inlist): for i,val in enumerate(inlist): if i==0: tmp = val elif val != valinc: yield [tmp, valinc] tmp = val valinc = val+1 yield [tmp, valinc] def interv3(inseq): first = True for val in inseq: if first: tmp = val first = False elif val != valinc: yield [tmp, valinc] tmp = val valinc = val + 1 if not first: yield [tmp, valinc] tests = [ [3, 4, 6, 9, 12, 14, 15, 16], [3, 3, 3], [], ] for func in (interv3, interv2): for test in tests: print "%s(%s) ->" % (func.__name__, test) result = list(func(test)) print "\t%r" % result C:\junk>interval.py interv3([3, 4, 6, 9, 12, 14, 15, 16]) -> [[3, 5], [6, 7], [9, 10], [12, 13], [14, 17]] interv3([3, 3, 3]) -> [[3, 4], [3, 4], [3, 4]] interv3([]) -> [] interv2([3, 4, 6, 9, 12, 14, 15, 16]) -> [[3, 5], [6, 7], [9, 10], [12, 13], [14, 17]] interv2([3, 3, 3]) -> [[3, 4], [3, 4], [3, 4]] interv2([]) -> Traceback (most recent call last): File "C:\junk\interval.py", line 33, in ? result = list(func(test)) File "C:\junk\interval.py", line 9, in interv2 yield [tmp, valinc] UnboundLocalError: local variable 'tmp' referenced before assignment C:\junk> -- http://mail.python.org/mailman/listinfo/python-list
Re: Replace one element of a tuple (LONG)
BartlebyScrivener wrote: >>>that one column is always the same, the name of the host that >>>the database resides on. > > > Then why are you pulling all of the other stuff out of the db? Why > don't you just > > UPDATE tablename > SET hostname(or colname) = 'localhost' > WHERE search condition = the rows you want to change > Well, there is an interactive dialog where the user picks which records s/he wants to put into the other database. So in the target database, that table may not even exist until the user selects which records go in there. But it does sound like I need to do some work on the database query :-) --Yan -- http://mail.python.org/mailman/listinfo/python-list
Re: Replace one element of a tuple (LONG)
>> that one column is always the same, the name of the host that >> the database resides on. Then why are you pulling all of the other stuff out of the db? Why don't you just UPDATE tablename SET hostname(or colname) = 'localhost' WHERE search condition = the rows you want to change -- http://mail.python.org/mailman/listinfo/python-list
Recommendations for CD/DVD-based or on-line Python classes?
Just curious... I have plenty of programming background (C++ being the closest to Python), and I have a copy of Lutz's "Learning Python," but before I dive head-first into that tome, does anyone know of a web-based or CD/DVD-based training class that's priced for individuals? Example of what I'm looking for: Something like 6 or 7 years ago Ziff-Davis had a bunch of on-line instructor-lead courses, where you'd read a chapter in a book, read the instructor's take on the chapter (just a few pages), perform the programming assignments, and ask the instructor if you had any difficulties. There was a solid schedule (ch. 1 this week, ch. 2 the next, etc. -- courses repeated every quarter or somesuch) as well. Ziff-Davis charged something like $99 or $199/year for this service (all the courses you wanted to sign up for -- quite reasonable, IMO) and also made money by requiring the use of their own books (which were often someone else's book that they'd just put their own name on) -- which were usually cheap enough at something like $30/ea. That whole setup worked quite well for me... anyone know of something similar? If not I probably will have to force myself to spend an hour a day or something going through Lutz's book... Thanks, ---Joel Kolstad -- http://mail.python.org/mailman/listinfo/python-list
Re: Conditional Expressions in Python 2.4
A.M wrote: > Do we have the conditional expressions in Python 2.4? No. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Can Python format long integer 123456789 to 12,3456,789 ?
Hi, Is there any built in feature in Python that can format long integer 123456789 to 12,3456,789 ? Thank you, Alan -- http://mail.python.org/mailman/listinfo/python-list
Re: Zope / Plone Groups
[EMAIL PROTECTED]: >are there any specific groups for zope / plone regarding questions? Try plone-users: http://plone.org/support -- René Pijlman -- http://mail.python.org/mailman/listinfo/python-list
Conditional Expressions in Python 2.4
Hi, I am using Python 2.4. I read the PEP 308 at: http://www.python.org/dev/peps/pep-0308/ I tried the statement: a= "Yes" if 1==1 else "No" but the interpreter doesn't accept it. Do we have the conditional expressions in Python 2.4? Thank you, Alan -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
In article <[EMAIL PROTECTED]>, Paddy <[EMAIL PROTECTED]> wrote: > >What I ran was more like the version below, but i did a quick >separation of the line that has the ';' in it and goofed. > def interv2(inlist): >...for i,val in enumerate(inlist): >...if i==0: >...tmp = val >...elif val != valinc: >...yield [tmp, valinc]; tmp = val >...valinc = val+1 >...yield [tmp, valinc] >... list(interv2(inlist)) >[[3, 4], [6, 9], [12, 14], [15, 16]] Fails on an empty list, as tmp is not defined when it hits the yield -- Jim Segrave ([EMAIL PROTECTED]) -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
In article <[EMAIL PROTECTED]>, Paddy <[EMAIL PROTECTED]> wrote: >I did a little re-arranging of the generator version: > >def interv3(inlist): >tmp = inlist[0] >valinc = tmp+1 >for val in inlist[1:]: >if val != valinc: >yield [tmp, valinc]; >tmp = val >valinc = val+1 >yield [tmp, valinc] Still fails when passed an empty list, the initial assignment to tmp is an IndexError -- Jim Segrave ([EMAIL PROTECTED]) -- http://mail.python.org/mailman/listinfo/python-list
Re: Replace one element of a tuple (LONG)
Brian wrote:
> Captain Dondo wrote:
>
>>What I'd like to do is build the correct selectlist in the first place,
>>rather than build the wrong one and then rebuild a correct one.
>
>
> This is sounding more like a SQL/DB problem and less like a Python one.
> If you have a field that is being pulled from the database that you
> would like to do a substitution on, I'm fairly sure MySQL includes a
> CASE statement in their flavor of SQL. Instead of performing a SELECT
> * in your script you could select the individual fields you want, and
> instead of just pulling the problematic column as is, you could pull it
> as something like "select case when sourcehost = x then y else
> sourcehost end case, ...". Naturally if an entire column needs to be
> replaced with a static value, you won't even need to use CASE.
>
AFAICT, that one column is always the same, the name of the host that
the database resides on. As myth can use multiple backends , it sort of
makes sense, but it seems redunandant to me. Even with mutliple
backends, I would hope you have a single database
I thought about just picking all the other fields via the SQL query, but
this seemed simpler to me
Anyway, here's the code I came up with:
for listing in itemlist:
(rectitle, recdate) = listing.split('|',1)
c.execute("""SELECT * FROM recorded WHERE title=%s AND
starttime=%s""",(rectitle,recdate))
for listitem in c.fetchall():
if 'tooth.seiner.lan' in listitem:
selectlist.append(listitem[:7] +
('hermes.seiner.lan',) + listitem[9:])
else:
selectlist.append(listitem)
--
http://mail.python.org/mailman/listinfo/python-list
Re: if not CGI:
Max a écrit : (snip) > But now I'm ready to do it in the real world. Nothing complicated, but a > real project. And I have to choose my tools. Zope, Plone, Django, what > are these? Zope -> an application server Plone -> a CMS built upon Zope Django -> a MVC fullstack framework (fullstack : integration with a server + ORM + template system + various utilities). > I don't have to stick with Python, although it's my preferred > language. I know Python, Java and C++. But I'm ready to learn Ruby if > RoR is as good as they say. RoR is not bad, but really over-hyped. There's no shortage of at least as good solutions in Python. You may want to look at Django, Turbogears, Pylons, web.py etc. for fullstack MVC frameworks. There are more barebones solutions, like CherryPy (the application server Turbogears is built upon), Myghty (extended perl::Mason port, used by Pylons), mod_python (if you're an hard-core Apache fanatic), WebStack (if you want to deploy on almost any server), and some other pieces like formencode (form validation), SQLObject (ORM, used by Turbogears and Pylons), SQLAlchemy (another ORM, very promising, by the author of Myghty), Routes (port of RoR routes, used by Pylons) and a lot of templating systems. So you can even build your own fullstack framework from existing pieces (that's what Turbogears and Pylons are doing FWIW). And also whole lot of more specific solutions : Albatross, Quixote, Karrigel, Twisted/nevow, (...), and of course Zope 2.x and 3.x, but it may be overkill and long to learn. Also, FWIW, Trac is almost a usable (somewhat minimalist) framework on it's own. So the problem is not "are there good solutions", but "which one to choose" !-) The answer of course depends on what you want and what you like, but taking a few days to play with Turbogears, Django and Pylons might be a good idea. > I could do it in Python cgi (or mod_python). But it seems from all the > hype that this is not a good way to write scaleable, extensible web > applications. Trac is a perfect counter-example IMHO. -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
Jim Segrave wrote: > In article <[EMAIL PROTECTED]>, > Paddy <[EMAIL PROTECTED]> wrote: > >=== interv2 === > def interv2(inlist): > >... for i,val in enumerate(inlist): > >... if i==0: > >... tmp = val > >... elif val != valinc: > >... yield [tmp, valinc] > >... tmp = val > >... valinc = val+1 > >... yield [tmp, valinc] > >... > list(interv2(inlist)) > >[[3, 4], [6, 9], [12, 14], [15, 16]] > > > >=== END interv2 === > > This doesn't actually run, changing it to make it do so: > > def interv2(inlist): > tmp = valinc = 0 > for i,val in enumerate(inlist): > if i==0: > tmp = val > valinc = val + 1 > elif val != valinc: > yield [tmp, valinc] > tmp = val > valinc = val+1 > yield [tmp, valinc] > > it now works, but returns [0, 0] when passed an empty list, when it > should return nothing at all > -- > Jim Segrave ([EMAIL PROTECTED]) Jim, I had tabs/spaces indent problems when cut-n-pasting. What I ran was more like the version below, but i did a quick separation of the line that has the ';' in it and goofed. >>> def interv2(inlist): ... for i,val in enumerate(inlist): ... if i==0: ... tmp = val ... elif val != valinc: ... yield [tmp, valinc]; tmp = val ... valinc = val+1 ... yield [tmp, valinc] ... >>> list(interv2(inlist)) [[3, 4], [6, 9], [12, 14], [15, 16]] -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
In article <[EMAIL PROTECTED]>, Paddy <[EMAIL PROTECTED]> wrote: >=== interv2 === def interv2(inlist): >...for i,val in enumerate(inlist): >...if i==0: >...tmp = val >...elif val != valinc: >...yield [tmp, valinc] >... tmp = val >...valinc = val+1 >...yield [tmp, valinc] >... list(interv2(inlist)) >[[3, 4], [6, 9], [12, 14], [15, 16]] > >=== END interv2 === This doesn't actually run, changing it to make it do so: def interv2(inlist): tmp = valinc = 0 for i,val in enumerate(inlist): if i==0: tmp = val valinc = val + 1 elif val != valinc: yield [tmp, valinc] tmp = val valinc = val+1 yield [tmp, valinc] it now works, but returns [0, 0] when passed an empty list, when it should return nothing at all -- Jim Segrave ([EMAIL PROTECTED]) -- http://mail.python.org/mailman/listinfo/python-list
Re: Replace one element of a tuple (LONG)
Captain Dondo wrote: > What I'd like to do is build the correct selectlist in the first place, > rather than build the wrong one and then rebuild a correct one. This is sounding more like a SQL/DB problem and less like a Python one. If you have a field that is being pulled from the database that you would like to do a substitution on, I'm fairly sure MySQL includes a CASE statement in their flavor of SQL. Instead of performing a SELECT * in your script you could select the individual fields you want, and instead of just pulling the problematic column as is, you could pull it as something like "select case when sourcehost = x then y else sourcehost end case, ...". Naturally if an entire column needs to be replaced with a static value, you won't even need to use CASE. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
I did a little re-arranging of the generator version: def interv3(inlist): tmp = inlist[0] valinc = tmp+1 for val in inlist[1:]: if val != valinc: yield [tmp, valinc]; tmp = val valinc = val+1 yield [tmp, valinc] -- http://mail.python.org/mailman/listinfo/python-list
Re: struct: type registration?
On 2/06/2006 4:18 AM, Serge Orlov wrote:
> Giovanni Bajo wrote:
>> John Machin wrote:
>>> I am an idiot, so please be gentle with me: I don't understand why you
>>> are using struct.pack at all:
>> Because I want to be able to parse largest chunks of binary datas with custom
>> formatting. Did you miss the whole point of my message:
>>
>> struct.unpack("3liiSiiShh", data)
>
> Did you want to write struct.unpack("Sheesh", data) ? Seriously, the
> main problem of struct is that it uses ad-hoc abbreviations for
> relatively rarely[1] used functions calls and that makes it hard to
> read.
Indeed. The first time I saw something like struct.pack('20H', ...) I
thought it was a FORTRAN format statement :-)
>
> If you want to parse binary data use pyconstruct
>
Solved: Tktable, WinXP and ActiveState Python 2.4.3,x
[EMAIL PROTECTED] wrote:
> Hi,
> I have a python app that runs fine on MacOS X and Fedora Core 5.
>
> This evening I dragged the folder over to my windows partition and
> tried to run the rascal.
>
> The program starts up fine but at the first call to create a Table
> object
> I get
>
> Traceback (most recent call last):
> File
> "C:\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py",
> line 310, in RunScript
> exec codeObject in __main__.__dict__
> File "C:\Documents and
> Settings\Jerry\Desktop\PyPgBrowseUni\PyPgExplorer.py", line 7, in ?
> obj.main()
> File "C:\Documents and
> Settings\Jerry\Desktop\PyPgBrowseUni\Resources\PyPgBrowse.py", line 72,
> in main
> self.build_ui( info)
> File "C:\Documents and
> Settings\Jerry\Desktop\PyPgBrowseUni\Resources\PyPgBrowse.py", line
> 187, in build_ui
> rowtagcommand=self.rowproc
> File "C:\Documents and
> Settings\Jerry\Desktop\PyPgBrowseUni\Resources\Tktable.py", line 64, in
> __init__
> master.tk.call('load', '', 'Tktable' )
> TclError: package "Tktable" isn't loaded statically
> :
>
> I get the same error if I try to create a Table object from the command
> line
> in a console.
>
> I tried waving a dead chicken at my laptop but it did no good.
>
> Is there some special magic to get Tktable.py to play nice?
> I do have the latest Tcl from Active State loaded on my box and
> the Tktable in my Tk programs work well...
>
> Thanks for any insight
>
> Jerry
Thanks to the good folks at Active State here is a way to use tktable
from Python.
1) Put the wrapper file Tktable.py into C:\Python24\Lib\lib-tk
2) Copy the whole folder C:\Tcl\lib\Tktable* to C:\Python\tcl
Letter Rip
Thanks Jeff...
Jerry
--
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Re: An oddity in list comparison and element assignment
On Thu, 01 Jun 2006 15:12:23 -0700 [EMAIL PROTECTED] wrote: #> I believe that 'is' tests equality of reference, such that #> #> >>> a = range(1,3) #> >>> b = range(1,3) #> >>> a is b #> False #> #> The 'is' operator tells you whether a and b refer to the same object. #> What I've been discussing is whether == should test for "structural" #> equality so that a and b remain equivalent under parallel mutations #> (and also under single mutations to common references) What does "parallel mutations" mean? In particular, what should be the results of each of the following three comparisons: x, y, z = [1],[1],[1] a, b = [x,y], [y,z] c, d = [[1],[1]], [[1],[1]] a == b c == d a[0].remove(1) b[0].remove(1) a == b So, do I understand correctly that you would like first comparison (a==b) to return "False" and second comparison (c==d) to return "True"? -- Best wishes, Slawomir Nowaczyk ( [EMAIL PROTECTED] ) Living on Earth may be expensive, but it includes an annual free trip around the Sun. -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
[EMAIL PROTECTED] wrote: > hello, > > i'm looking for a way to have a list of number grouped by consecutive > interval, after a search, for example : > > [3, 6, 7, 8, 12, 13, 15] > > => > > [[3, 4], [6,9], [12, 14], [15, 16]] > > (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => > [6:9], and so on) > > i was able to to it without generators/yield but i think it could be > better with them, may be do you an idea? > > best regards, > > J. I did a proceedural version, then re-read your post and did a generator based version ;-) === interv1 === >>> inlist = [3, 6, 7, 8, 12, 13, 15] >>> tmp = [] >>> for i,val in enumerate(inlist): ... if i==0: ... tmp.append(val) ... elif val != valinc: ... tmp += [valinc, val] ... valinc = val+1 ... >>> tmp.append(valinc) >>> tmp [3, 4, 6, 9, 12, 14, 15, 16] >>> tmp[0::2] [3, 6, 12, 15] >>> tmp[1::2] [4, 9, 14, 16] >>> zip(tmp[0::2], tmp[1::2]) [(3, 4), (6, 9), (12, 14), (15, 16)] >>> === END interv1 === === interv2 === >>> def interv2(inlist): ... for i,val in enumerate(inlist): ... if i==0: ... tmp = val ... elif val != valinc: ... yield [tmp, valinc] ... tmp = val ... valinc = val+1 ... yield [tmp, valinc] ... >>> list(interv2(inlist)) [[3, 4], [6, 9], [12, 14], [15, 16]] === END interv2 === - Paddy. -- http://mail.python.org/mailman/listinfo/python-list
Re: argmax
David Isaac wrote: > 2. Is this a good argmax (as long as I know the iterable is finite)? > def argmax(iterable): return max(izip( iterable, count() ))[1] Other than the subtle difference that Peter Otten pointed out, that's a good method. However if the iterable is a list, it's cleaner (and more efficient) to use seq.index(max(seq)). That way you won't be creating and comparing all those tuples. def argmax(it): try: it.index except AttributeError: it = list(it) # Or if it would too expensive to convert it to list: #return -max((v, -i) for i, v in enumerate(it))[1] return it.index(max(it)) --Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter - changing existing Dialog?
On Thu, 2006-06-01 at 08:31 -0400, Michael Yanowitz wrote: > Hello: > > >I have a Tkinter GUI Dialog with many buttons and labels and text > widgets. > What I would like to do is, can I: > > 1) Disable/deactivate/hide a button, text widget that is already drawn (and >of course the opposite enable/activate/show it)? > > 2) Change the text of a label or button that is already drawn? > > based on actions taken by the user. Can it be done without destroying > the present dialog or the objects in it and creating a new one? > > Sorry for what probably is such a trivial and basic question. I just can't > find the answer or know what the technical term for what I want to do is to > search for it myself. To disable/deactivate a button widget, use the keyword 'state'. For example, import Tkinter as Tk root = Tk.Tk() bid = Tk.Button(root, text='test', state=Tk.NORMAL) bid.pack() bid.configure(state=Tk.DISABLED) If you want to hide the button (using Pack geometry manager): bid.pack_forget() You can pack it again using bid.pack() but it may be difficult to pack it back where you originally intended. If you are using the Grid geometry manager: bid.grid_forget() To put it back simply call grid again with the same row, column. Changing the text of a label or button already drawn is simply done by a call to the configure method on the button or label's text attribute: bid.configure(text='Help') Regards, John -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- http://mail.python.org/mailman/listinfo/python-list
Re: losing handles of open files
Please don't post non-text message bodies to discussion forums. Message bodies should be plain text. "Anthra Norell" <[EMAIL PROTECTED]> writes: > If a piece of code exits with an exception before it closes an open > file, that file seems to remain locked, which is real pain in the > butt You will want to examine the 'finally' clause, which is executed after the 'try' suite regardless of exceptions. http://docs.python.org/ref/exceptions.html> http://docs.python.org/ref/try.html#try> You may also be interested in the 'with' statement, coming in Python 2.5, which will be a more natural way of expressing this idiom. http://docs.python.org/dev/whatsnew/section-generators.html> -- \ "If nature has made any one thing less susceptible than all | `\others of exclusive property, it is the action of the thinking | _o__) power called an idea" -- Thomas Jefferson | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: TSV to HTML
Dennis Lee Bieber wrote:
> On 1 Jun 2006 03:29:35 -0700, "Brian" <[EMAIL PROTECTED]> declaimed the
> following in comp.lang.python:
>
> > Thank you for that response. Your code was very helpful to me. I
> > think that actually seeing how it should be done in Python was a lot
> > more educational than spending hours with trial and error.
> >
> It's not the best code around -- I hacked it together pretty much
> line-for-line from an assumption of what the Ruby was doing (I don't do
> Ruby -- too much PERL idiom in it)
>
> > One question (and this is a topic that I still have trouble getting my
> > arms around). Why is the text in STYLEBLOCK tripple quoted?
> >
> Triple quotes allow: 1) use of single quotes within the block
> without needing to escape them; 2) allows the string to span multiple
> lines. Plain string quoting must be one logical line to the parser.
>
> I've practically never seen anyone use a line continuation character
> in Python. And triple quoting looks cleaner than parser concatenation.
>
> The alternatives would have been:
>
> Line Continuation:
> STYLEBLOCK = '\n\
> \n\
> td {\n\
> border-left:1px solid #00;\n\
> padding-right:4px;\n\
> padding-left:4px;\n\
> white-space: nowrap;}\n\
> .cellTitle {\n\
> border-bottom:1px solid #00;\n\
> background:#e0;\n\
> font-weight: bold;\n\
> text-align: center; }\n\
> .cell0 { background:#3ff1f1;}\n\
> .cell1 { background:#f8f8f8;}\n\
> \n\
> '
> Note the \n\ as the end of each line; the \n is to keep the
> formatting on the generated HTML (otherwise everything would be one long
> line) and the final \ (which must be the physical end of line)
> signifying "this line is continued". Also note that I used ' rather than
> " to avoid escaping the " on text/css.
>
> Parser Concatenation:
> STYLEBLOCK = (
> '\n'
> "td {\n"
> "border-left:1px solid #00;\n"
> "padding-right:4px;\n"
> "padding-left:4px;\n"
> "white-space: nowrap;}\n"
> ".cellTitle {\n"
> "border-bottom:1px solid #00;\n"
> "background:#e0;\n"
> "font-weight: bold;\n"
> "text-align: center; }\n"
> ".cell0 { background:#3ff1f1;}\n"
> ".cell1 { background:#f8f8f8;}\n"
> "\n"
> )
>
> Note the use of ( ) where the original had """ """. Also note that
> each line has quotes at start/end (the first has ' to avoid escaping
> text/css). There are no commas separating each line (and the \n is still
> for formatting). Using the ( ) creates an expression, and Python is nice
> enough to let one split expressions inside () or [lists], {dicts}, over
> multiple lines (I used that feature in a few spots to put call arguments
> on multiple lines). Two strings that are next to each other
>
> "string1" "string2"
>
> are parsed as one string
>
> "string1string2"
>
> Using """ (or ''') is the cleanest of those choices, especially if
> you want to do preformatted layout of the text. It works similar to the
> Ruby/PERL construct that basically said: Copy all text up to the next
> occurrence of MARKER_STRING.
Thank you for your explanation, now it makes sense.
Brian
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Re: Replace one element of a tuple (LONG)
BartlebyScrivener wrote:
>>>I've looked at various search-and-replace snippets but none that address
>>>what I am trying to do
>
>
> I think you need to tell more about what you're trying to do. You say
> it's in a database? Is that why you can't just put the whole blob in
> your text editor and do search-and-replace?
>
> And is that also why you can't turn it into a giant string and do
> giantstring.replace('unwanted','wanted')
>
> rd
>
Fair enough. I am trying to pull records from one database (on
tooth.seiner.lan) and create a smaller table with only selected elements
in another database (on localhost aka hermes).
My code so far:
import MySQLdb
import sys, os, os.path, time, string, dialog
masterBackend="tooth.seiner.lan"
toGoBackend="hermes.seiner.lan"
masterDB=MySQLdb.connect(host=masterBackend,user="mythtv",passwd="mythtv",db="mythconverg")
# pull recordings from masterDB
c=masterDB.cursor()
c.execute("""SELECT title, subtitle, starttime FROM recorded""")
# build our dialog checkbox
d = dialog.Dialog(dialog="dialog")
d.add_persistent_args(["--backtitle", "Myth2Go"])
recordings=[]
for listing in c.fetchall():
recordings.append(
(listing[0]+'|'+listing[2].isoformat(),
listing[1],0))
recordings.sort()
(retcode, itemlist) = d.checklist(text="",
height=15, width=70, list_height=7,
choices=recordings,
title="Which recordings do you want to transfer?")
selectlist=[]
for listing in itemlist:
print listing
(rectitle, recdate) = listing.split('|',1)
c.execute("""SELECT * FROM recorded WHERE title=%s AND
starttime=%s""",(rectitle,recdate))
selectlist.append(c.fetchone())
The problem is the last line. I am creating a bunch of tuples that are,
for my purposes, incorrect. I would like to create them with
masterBackend replaced by toGoBackend.
Currently (I corrected a small bug based on another post) after a user
selects what recordings s/he wants, selectlist contains:
[
(1028L, datetime.datetime(2006, 5, 26, 7, 0), datetime.datetime(2006, 5,
26, 7, 30), 'Arthur', "What's Cooking?; Buster's Special Delivery", '',
'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L, 'Default', 9L,
'SH044107', 'EP0441070207', datetime.datetime(2006, 5, 26, 7, 31, 1),
1162899392L, 0.0, 0, datetime.date(2006, 5, 26), 0, 0L, 0),
(1028L, datetime.datetime(2006, 5, 27, 9, 0), datetime.datetime(2006, 5,
27, 9, 30), 'Arthur', 'Unfinished; D.W., Bossy Boots', '', 'Children',
'tooth.seiner.lan', None, 0L, None, 1L, 1L, 'Default', 9L, 'SH044107',
'EP0441070204', datetime.datetime(2006, 5, 27, 9, 31, 26), 1164783552L,
0.0, 0, datetime.date(2006, 5, 23), 0, 0L, 0),
(1028L, datetime.datetime(2006, 5, 30, 7, 0), datetime.datetime(2006, 5,
30, 7, 30), 'Arthur', 'Prunella Sees the Light; Return of the Snowball',
'Prunella prepares for a sleepover with Marina; D.W. protects a
snowball.', 'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L,
'Default', 9L, 'SH044107', 'EP0441070123', datetime.datetime(2006, 5,
30, 7, 31, 24), 1164179392L, 0.0, 1, datetime.date(2002, 11, 28), 0, 0L, 0)
]
which is the correct format to insert into the new database.
What I'd like to do is build the correct selectlist in the first place,
rather than build the wrong one and then rebuild a correct one.
I can't find a replace method that would work on a tuple (not surprising
since they're immutable) but I also can't find a replace function that
would replace an element of a tuple and return a new tuple.
--Yan
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Re: grouping a flat list of number by range
[EMAIL PROTECTED] wrote: > i'm looking for a way to have a list of number grouped by consecutive > interval, after a search, for example : > > [3, 6, 7, 8, 12, 13, 15] > > => > > [[3, 4], [6,9], [12, 14], [15, 16]] > > (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => > [6:9], and so on) > > i was able to to it without generators/yield but i think it could be > better with them, may be do you an idea? Sure: def group_intervals(it): it = iter(it) val = it.next() run = [val, val+1] for val in it: if val == run[1]: run[1] += 1 else: yield run run = [val, val+1] yield run --Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
I believe that 'is' tests equality of reference, such that >>> a = range(1,3) >>> b = range(1,3) >>> a is b False The 'is' operator tells you whether a and b refer to the same object. What I've been discussing is whether == should test for "structural" equality so that a and b remain equivalent under parallel mutations (and also under single mutations to common references) Cheers, Mike Maric Michaud wrote: > Le Jeudi 01 Juin 2006 18:00, [EMAIL PROTECTED] a écrit : > > Perhaps the most fundamental notion is mathematics is that the left and > > right sides of an equation remain identical after any operation applied > > to both sides. > > IMHO, you are not aware that the '=' symbol of mathematics exists in python, > it's the 'is' assertion. > > a is b > and then, do what you want with a (or b), a is b remains True. > > THIS is the meaning of expr1 = expr2, but in computer science, this is not as > important as it is in pure logic (most languages do not even provide the 'is' > assertion). > > -- > _ > > Maric Michaud > _ > > Aristote - www.aristote.info > 3 place des tapis > 69004 Lyon > Tel: +33 426 880 097 -- http://mail.python.org/mailman/listinfo/python-list
Re: grouping a flat list of number by range
In article <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> wrote: >hello, > >i'm looking for a way to have a list of number grouped by consecutive >interval, after a search, for example : > >[3, 6, 7, 8, 12, 13, 15] > >=> > >[[3, 4], [6,9], [12, 14], [15, 16]] > >(6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => >[6:9], and so on) > >i was able to to it without generators/yield but i think it could be >better with them, may be do you an idea? There are probably better ways, but this works > >best regards, > >J. class IterInterval(object): """Create an iterator which, given a list of integers, for each run of consecutive integers i...j, yields a two element list [i, j + 1] Singleton lists [i] return [i, i + 1] Empty lists return None """ def __init__(self, seq): self.seq = seq self.firstval = None self.index = 0 def __iter__(self): # firstval = the start of a run of consecutive integers # lastval = the last value found in the run # nextval = the most recent value taken from the input list if not self.firstval: # set up the first iteration if self.index >= len(self.seq): # empty list, return raise StopIteration self.firstval = lastval = int(self.seq[self.index]) self.index += 1 while True: if self.index >= len(self.seq): # list exhausted, output the last value read yield [self.firstval, lastval + 1] raise StopIteration nextval = int(self.seq[self.index]) self.index += 1 if nextval == lastval + 1: lastval = nextval continue else: # end of run - output the run, reset for next call yield [self.firstval, lastval + 1] self.firstval = lastval = nextval continue if __name__ == '__main__': for l in [[3, 6, 7, 8, 12, 13, 15], [2], []]: print l, "=>", [lst for lst in IterInterval(l)] /usr/home/jes% python interval.py [3, 6, 7, 8, 12, 13, 15] => [[3, 4], [6, 9], [12, 14], [15, 16]] [3] => [[3, 4]] [] => [] -- Jim Segrave ([EMAIL PROTECTED]) -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
On Thu, 01 Jun 2006 13:40:34 -0700 [EMAIL PROTECTED] wrote: #> Scott David Daniels wrote: #> > Would you say that envelope containing five $100 bills is equal to #> > an envelope containing five $100 bills with different serial numbers? #> Yes (unless I was testing the assertion that the second envelope did #> not contain counterfeits of the first) So, what if Bank of America later decided that bills with serial numbers containing "7" are no longer valid? In other word, *if* you assume equality must be preserved by future modifications, than no two different (modifiable) objects can ever be really equal. -- Best wishes, Slawomir Nowaczyk ( [EMAIL PROTECTED] ) I believe that math illiteracy affects 7 out of every 5 people. -- http://mail.python.org/mailman/listinfo/python-list
Re: urllib2 and HTTP 302
Laszlo Nagy <[EMAIL PROTECTED]> writes:
[...]
> how can I return the redirection URL?
> I tried to get this information from the exception but I could not. Is
> it possible to read it from the openerdirector?
> Any suggestions?
>
>
> try:
>self.post_multipart(
> url,
> [('uploadType','Inventory')],
> [('uploadFileName','inv.txt',fdata)]
> )
> except urllib2.HTTPError, e:
> if e.code == 302:
> return "I would like to get the URL to be redirected
> to"
> else:
> raise
redirected_url = e.geturl()
John
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Re: Finding a lost PYTHONPATH with find
Edward Elliott <[EMAIL PROTECTED]> writes:
> John J. Lee wrote:
>
> > find / -maxdepth 3 -size -100k -type f -exec grep -sli pythonpath '{}' \;
> >
> >
> > The minus in '-100k' (meaning "less than 100k") seems to be
> > undocumented, at least on my system.
>
> It should be standard in linux man pages, can't speak for other unices:
>
>TESTS
>Numeric arguments can be specified as
>
>+n for greater than n,
>
>-n for less than n,
>
>n for exactly n.
>
> Maybe you were fooled because it's not directly under the description of
> -size.
Yes, that's right -- thanks.
> > I suppose the -maxdepth is
> > redundant since I think find searches breadth-first by default.
>
> ??? maxdepth determines how deep the search will look, not the order the
> search occurs. Your search only find things within 3 levels of the root,
> unless your directory tree goes no deeper than that (very unlikely) the
> maxdepth can't be redundant.
It can if you hit Control-C as soon as it finds the damn thing :-) --
which is exactly what I would have done, of course.
John
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Re: An oddity in list comparison and element assignment
Truthfully, I wouldn't mind it at all. In Python, I frequently write things like i == int(f) or vice versa just to avoid subtle bugs that sometimes creep in when later modifications to code change the original assumptions. When working in C, I always set the compiler for maximum warnings and do my damndest to make them all go away. In the long run, time spent on rigorous coding always repays itself with interest in time saved debugging. Mike Erik Max Francis wrote: > [EMAIL PROTECTED] wrote: > > > With all due respect to your well-deserved standing in the Python > > community, I'm not convinced that equality shouldn't imply invariance > > under identical operations. > > Doo you really want > > 2 == 2.0 > > to be False? > > -- > Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/ > San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis >Without victory there is no survival. >-- Winston Churchill -- http://mail.python.org/mailman/listinfo/python-list
Re: Using print instead of file.write(str)
Yes, it saved my time big time.
Thank you Bruno.
I use the print >>>file to generate HTML files. print is very flexible and
nice.
The dictionary formatting that Brunto said is awesome!
Thanks again,
Alan
"Jon Clements" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Didn't know of the >> syntax: lovely to know about it Bruno - thank
you.
To the OP - I find the print statement useful for something like:
print 'this','is','a','test'
>>> 'this is a test'
(with implicit newline and implicit spacing between parameters)
If you want more control (more flexibility, perhaps?) over the
formatting of the output: be it spacing between parameters or newline
control, use the methods Bruno describes below.
I'm not sure if you can suppress the spacing between elements (would
love to be corrected though); to stop the implicit newline use
something like
print 'testing',
>>> 'testing'
(but - with the leading comma, the newline is suppressed)
I personally find that print is convenient for sentences (or writing
'lines').
Thought it worth pointing this out in case, like some I know, you come
across a cropper with certain output streams.
All the best,
Jon.
Bruno Desthuilliers wrote:
> A.M a écrit :
> > Hi,
> >
> >
> > I found print much more flexible that write method. Can I use print
> > instead
> > of file.write method?
> >
>
> f = open("/path/to/file")
> print >> f, "this is my %s message" % "first"
> f.close()
>
> To print to stderr:
>
> import sys
> print >> sys.stderr, "oops"
>
> FWIW, you and use string formating anywhere, not only in print statements:
>
> s = "some %s and % formating" % ("nice", "cool")
> print s
>
> You can also use "dict formating":
>
> names = {"other": "A.M.", "me" : "bruno"}
> s = "hello %(other)s, my name is %(me)s" % names
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Re: Replace one element of a tuple
>> I've looked at various search-and-replace snippets but none that address
>> what I am trying to do
I think you need to tell more about what you're trying to do. You say
it's in a database? Is that why you can't just put the whole blob in
your text editor and do search-and-replace?
And is that also why you can't turn it into a giant string and do
giantstring.replace('unwanted','wanted')
rd
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Re: grouping a flat list of number by range
[EMAIL PROTECTED] wrote: > i'm looking for a way to have a list of number grouped by consecutive > interval, after a search, for example : > > [3, 6, 7, 8, 12, 13, 15] > > => > > [[3, 4], [6,9], [12, 14], [15, 16]] > > (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => > [6:9], and so on) > > i was able to to it without generators/yield but i think it could be > better with them, may be do you an idea? Don't hold back your code. Would it work to replace each occurrence of result_list.append([start, stop]) with yield [start, stop] ? Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
Le Jeudi 01 Juin 2006 18:00, [EMAIL PROTECTED] a écrit : > Perhaps the most fundamental notion is mathematics is that the left and > right sides of an equation remain identical after any operation applied > to both sides. IMHO, you are not aware that the '=' symbol of mathematics exists in python, it's the 'is' assertion. a is b and then, do what you want with a (or b), a is b remains True. THIS is the meaning of expr1 = expr2, but in computer science, this is not as important as it is in pure logic (most languages do not even provide the 'is' assertion). -- _ Maric Michaud _ Aristote - www.aristote.info 3 place des tapis 69004 Lyon Tel: +33 426 880 097 -- http://mail.python.org/mailman/listinfo/python-list
Re: Using print instead of file.write(str)
I meant 'trailing': not leading.
mea culpa.
Jon.
Jon Clements wrote:
> Didn't know of the >> syntax: lovely to know about it Bruno - thank
> you.
>
> To the OP - I find the print statement useful for something like:
> print 'this','is','a','test'
> >>> 'this is a test'
> (with implicit newline and implicit spacing between parameters)
>
> If you want more control (more flexibility, perhaps?) over the
> formatting of the output: be it spacing between parameters or newline
> control, use the methods Bruno describes below.
>
> I'm not sure if you can suppress the spacing between elements (would
> love to be corrected though); to stop the implicit newline use
> something like
> print 'testing',
> >>> 'testing'
> (but - with the leading comma, the newline is suppressed)
>
> I personally find that print is convenient for sentences (or writing
> 'lines').
>
> Thought it worth pointing this out in case, like some I know, you come
> across a cropper with certain output streams.
>
> All the best,
>
> Jon.
>
>
>
> Bruno Desthuilliers wrote:
> > A.M a écrit :
> > > Hi,
> > >
> > >
> > > I found print much more flexible that write method. Can I use print
> > > instead
> > > of file.write method?
> > >
> >
> > f = open("/path/to/file")
> > print >> f, "this is my %s message" % "first"
> > f.close()
> >
> > To print to stderr:
> >
> > import sys
> > print >> sys.stderr, "oops"
> >
> > FWIW, you and use string formating anywhere, not only in print statements:
> >
> > s = "some %s and % formating" % ("nice", "cool")
> > print s
> >
> > You can also use "dict formating":
> >
> > names = {"other": "A.M.", "me" : "bruno"}
> > s = "hello %(other)s, my name is %(me)s" % names
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Re: struct: type registration?
On 2/06/2006 3:44 AM, Giovanni Bajo wrote:
> John Machin wrote:
>
>>> Looks like you totally misread my message.
>> Not at all.
>>
>> Your function:
>>
>> def mystring_pack(s):
>> if len(s) > 20:
>> raise ValueError, "a mystring can be at max 20 chars"
>> s = (s + "\0"*20)[:20]
>> s = struct.pack("20s", s)
>> return s
>>
>> can be even better replaced by (after reading the manual "For packing,
>> the string is truncated or padded with null bytes as appropriate to
>> make it fit.") by:
>>
>> def mystring_pack(s):
>> if len(s) > 20:
>> raise ValueError, "a mystring can be at max 20 chars"
>> return s
>> # return s = (s + "\0"*20)[:20] # not needed, according to the
>> manual # s = struct.pack("20s", s)
>> # As I said, this particular instance of using struct.pack is a
>> big fat no-op.
>
> John, the point of the example was to show that one could write custom
> packer/unpacker which calls struct.pack/unpack and, after that,
> post-processes the results to obtain some custom data type.
What you appear to be doing is proposing an API for extending struct by
registering custom type-codes (ASCII alphabetic?) each requiring three
call-back functions (mypacker, myunpacker, mylength).
Example registration for an "S" string (fixed storage length, true
length determined on unpacking by first occurrence of '\0' (if any)).
struct.register("S", packerS, unpackerS, lengthS)
You give no prescription for what those functions should do. You provide
"examples" which require reverse engineering to deduce of what they are
intended to be exemplars.
Simple-minded folk like myself might expect that the functions would
work something like this:
Packing: when struct.pack reaches the custom code in the format, it does
this (pseudocode):
obj = _get_next_arg()
itemstrg = mypacker(obj)
_append_to_output_string(itemstrg)
Unpacking: when struct.unpack reaches a custom code in the format, it
does this (pseudocode):
n = mylength()
# exception if < n bytes remain
obj = myunpacker(remaining_bytes[:n])
_append_to_output_tuple(obj)
Thus, in a simple case like the NUL-terminated string:
def lengthS():
return 20
def packerS(s):
assert len(s) <= 20
return s.ljust(20, '\0')
# alternatively, return struct.pack("20s", s)
def unpackerS(bytes):
assert len(bytes) == 20
i = bytes.find('\0')
if i >= 0:
return bytes[:i]
return bytes
In more complicated cases, it may be useful for either/both the
packer/unpacker custom functions to call struct.pack/unpack to assist in
the assembly/disassembly exercise. This should be (1) possible without
perturbing the state of the outer struct.pack/unpack invocation (2)
sufficiently obvious to warrant little more than a passing mention.
> Now, I apologize
> if my example wasn't exactly the shortest, most compact, most pythonic piece
> of code. It was not meant to be. It was meant to be very easy to read and
> very clear in what it is being done. You are nitpicking that part of my code
> is a no-op. Fine.
Scarcely a nitpick. It was very clear that parts of it were doing
absolutely nothing in a rather byzantine & baroque fashion. What was
unclear was whether this was by accident or design. You say (*after* the
examples) that "As shown, the custom packer/unpacker can call the
original pack/unpack as a basis for their work. ... when called
recursively ...". What basis for what work? As for recursion, I see no
"19s", "18s", etc here :-)
> Sorry if this confused you.
It didn't. As a self-confessed idiot, I am resolutely and irredeemably
unconfused.
> I was just trying to show a
> simple pattern:
>
> custom packer: adjust data, call struct.pack(), return
> custom unpacker: call struct.unpack(), adjust data, return
>
> I should have chosen a most complex example probably, but I did not want to
> confuse readers. It seems I have confused them by choosing too simple an
> example.
The problem was that you chose an example that had minimal justification
(i.e. only the length check) for a custom packer at all (struct.pack
pads the "s" format with NUL bytes) and no use at all for a call to
struct.unpack inside the custom unpacker.
Cheers,
John
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Re: Add file to zip, or replace file in zip
Skip over the file in question when you first are zipping the directory. Unfortunately you cannot replace or remove a file from a zip without unzipping and rezipping all the contents. -Chris On Wed, May 31, 2006 at 03:10:53PM +0800, majj81 wrote: >hi: > Good afternoon. > Has this problem solved in the URL >[1]http://mail.python.org/pipermail/python-list/2006-April/338849.html . >Now I have the same problem to deal with. If you have any suggestion >please tell me. > Thanks. >Johnny Ma >come from China > > > > >?? ?? ?? ?? ?? 1/2? ?? ?? ?? ?? ?? ?? ?? ?? >[2]?? ? ?? ?? '? ?? ?? ?? ?? ?? 1/2? ?? ?? ?? 1/4 1/4 ?? '' ?? Ajax >1/4 1/4 126 ??D 1/4? ?? ?? ?? ?? ?? ?? > > References > >Visible links >1. http://mail.python.org/pipermail/python-list/2006-April/338849.html >2. http://www.126.com/ > -- > http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Replace one element of a tuple
Captain Dondo wrote: > I have an array(?) (sorry, I'm new* to python so I'm probably mangling > the terminology) that looks like this: > > [((1028L, datetime.datetime(2006, 5, 30, 7, 0), datetime.datetime(2006, > 5, 30, 7, 30), 'Arthur', 'Prunella Sees the Light; Return of the > Snowball', 'Prunella prepares for a sleepover with Marina; D.W. protects > a snowball.', 'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L, > 'Default', 9L, 'SH044107', 'EP0441070123', datetime.datetime(2006, 5, > 30, 7, 31, 24), 1164179392L, 0.0, 1, datetime.date(2002, 11, 28), 0, 0L, > 0),), ((1028L, datetime.datetime(2006, 5, 4, 10, 0), > datetime.datetime(2006, 5, 4, 10, 30), 'Bob the Builder', 'Using Clues', > '', 'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L, 'Default', > 6L, 'SH326087', 'EP3260870141', datetime.datetime(2006, 5, 4, 10, 31, > 30), 1163673536L, 0.0, 1, datetime.date(2005, 3, 19), 0, 0L, 0),)] > > I want to replace every instance of 'tooth.seiner.lan' with 'localhost'. > There may be lots and lots of these entries (they're pulled from my > mythtv database). > > I could brute-force this by rewriting the whole thing and replacing > every 9th element but there has to be a better way > > I've looked at various search-and-replace snippets but none that address > what I am trying to do > > --Yan > > *I'm not really new to python, just very very rusty. Last time I used > it was about 3 years ago, and I was equally clueless There's a lot of parenthesis :) not easy to read, but unless I'm seeing something odd, you have string literals in a tuple. So I don't think your going to find a better way than brute force recreation. FYI lists are between [] and are mutable Tuples are between () and are immutable. If I'm countin paren's right you have a list that contains a tuple, that contains another tuple with 1 element in it. so you can recreate the tuples... or convert the whole thing to a list of lists. -- http://mail.python.org/mailman/listinfo/python-list
Re: Using print instead of file.write(str)
Didn't know of the >> syntax: lovely to know about it Bruno - thank
you.
To the OP - I find the print statement useful for something like:
print 'this','is','a','test'
>>> 'this is a test'
(with implicit newline and implicit spacing between parameters)
If you want more control (more flexibility, perhaps?) over the
formatting of the output: be it spacing between parameters or newline
control, use the methods Bruno describes below.
I'm not sure if you can suppress the spacing between elements (would
love to be corrected though); to stop the implicit newline use
something like
print 'testing',
>>> 'testing'
(but - with the leading comma, the newline is suppressed)
I personally find that print is convenient for sentences (or writing
'lines').
Thought it worth pointing this out in case, like some I know, you come
across a cropper with certain output streams.
All the best,
Jon.
Bruno Desthuilliers wrote:
> A.M a écrit :
> > Hi,
> >
> >
> > I found print much more flexible that write method. Can I use print instead
> > of file.write method?
> >
>
> f = open("/path/to/file")
> print >> f, "this is my %s message" % "first"
> f.close()
>
> To print to stderr:
>
> import sys
> print >> sys.stderr, "oops"
>
> FWIW, you and use string formating anywhere, not only in print statements:
>
> s = "some %s and % formating" % ("nice", "cool")
> print s
>
> You can also use "dict formating":
>
> names = {"other": "A.M.", "me" : "bruno"}
> s = "hello %(other)s, my name is %(me)s" % names
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Re: integer to binary...
[EMAIL PROTECTED] wrote: > does anyone know a module or something to convert numbers like integer > to binary format ? > > for example I want to convert number 7 to 0111 so I can make some > bitwise operations... > > Thanks Use the gmpy module. >>> import gmpy >>> a = 14 >>> b = 7 >>> c = 8 >>> help(gmpy.digits) Help on built-in function digits: digits(...) digits(x[,base]): returns Python string representing x in the given base (2 to 36, default 10 if omitted or 0); leading '-' present if x<0, but no leading '+' if x>=0. x must be an mpz, or else gets coerced into one. >>> print gmpy.digits(a,2) 1110 >>> print gmpy.digits(b,2) 111 >>> print gmpy.digits(c,2) 1000 >>> help(gmpy.setbit) Help on built-in function setbit: setbit(...) setbit(x,n,v=1): returns a copy of the value of x, with bit n set to value v; n must be an ordinary Python int, >=0; v, 0 or !=0; x must be an mpz, or else gets coerced to one. >>> d = gmpy.setbit(c,1,1) >>> print gmpy.digits(d,2) 1010 >>> help(gmpy.scan1) Help on built-in function scan1: scan1(...) scan1(x, n=0): returns the bit-index of the first 1-bit of x (that is at least n); n must be an ordinary Python int, >=0. If no more 1-bits are in x at or above bit-index n (which can only happen for x>=0, notionally extended with infinite 0-bits), None is returned. x must be an mpz, or else gets coerced to one. >>> help(gmpy.scan0) Help on built-in function scan0: scan0(...) scan0(x, n=0): returns the bit-index of the first 0-bit of x (that is at least n); n must be an ordinary Python int, >=0. If no more 0-bits are in x at or above bit-index n (which can only happen for x<0, notionally extended with infinite 1-bits), None is returned. x must be an mpz, or else gets coerced to one. >>> print gmpy.scan1(a) 1 >>> print gmpy.scan1(b) 0 >>> print gmpy.scan1(c) 3 >>> print gmpy.scan1(d) 1 >>> print gmpy.scan0(a) 0 >>> print gmpy.scan0(b) 3 >>> print gmpy.scan0(c) 0 >>> print gmpy.scan0(d) 0 >>> help(gmpy.popcount) Help on built-in function popcount: popcount(...) popcount(x): returns the number of 1-bits set in x; note that this is 'infinite' if x<0, and in that case, -1 is returned. x must be an mpz, or else gets coerced to one. >>> print gmpy.popcount(a) 3 >>> print gmpy.popcount(b) 3 >>> print gmpy.popcount(c) 1 >>> print gmpy.popcount(d) 2 >>> help(gmpy.hamdist) Help on built-in function hamdist: hamdist(...) hamdist(x,y): returns the Hamming distance (number of bit-positions where the bits differ) between x and y. x and y must be mpz, or else get coerced to mpz. >>> print gmpy.hamdist(a,b) 2 >>> print gmpy.hamdist(a,c) 2 >>> print gmpy.hamdist(a,d) 1 >>> print gmpy.hamdist(b,c) 4 >>> print gmpy.hamdist(b,d) 3 >>> print gmpy.hamdist(c,d) 1 -- http://mail.python.org/mailman/listinfo/python-list
grouping a flat list of number by range
hello, i'm looking for a way to have a list of number grouped by consecutive interval, after a search, for example : [3, 6, 7, 8, 12, 13, 15] => [[3, 4], [6,9], [12, 14], [15, 16]] (6, not following 3, so 3 => [3:4] ; 7, 8 following 6 so 6, 7, 8 => [6:9], and so on) i was able to to it without generators/yield but i think it could be better with them, may be do you an idea? best regards, J. -- http://mail.python.org/mailman/listinfo/python-list
Re: WinPops
Roger Upole wrote:
>
> "Hari Sekhon" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
>> Hi,
>> Is there a way of sending winpops (Windows Pop-Up / Net Send messages)
>> in python?
>>
>> Perhaps some library or something that I can use under both Windows and
>> Linux?
>>
>> Hari
>
> On Windows, you can use win32net.NetMessageBufferSend.
>
> Roger
>
On Linux, i use the smbclient binary:
from subprocess import *
q=Popen(['smbclient','-M','maggy'],stdin=PIPE)
q.stdin.write('hello!')
q.stdin.close()
q.wait()
Peter
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Replace one element of a tuple
I have an array(?) (sorry, I'm new* to python so I'm probably mangling the terminology) that looks like this: [((1028L, datetime.datetime(2006, 5, 30, 7, 0), datetime.datetime(2006, 5, 30, 7, 30), 'Arthur', 'Prunella Sees the Light; Return of the Snowball', 'Prunella prepares for a sleepover with Marina; D.W. protects a snowball.', 'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L, 'Default', 9L, 'SH044107', 'EP0441070123', datetime.datetime(2006, 5, 30, 7, 31, 24), 1164179392L, 0.0, 1, datetime.date(2002, 11, 28), 0, 0L, 0),), ((1028L, datetime.datetime(2006, 5, 4, 10, 0), datetime.datetime(2006, 5, 4, 10, 30), 'Bob the Builder', 'Using Clues', '', 'Children', 'tooth.seiner.lan', None, 0L, None, 1L, 1L, 'Default', 6L, 'SH326087', 'EP3260870141', datetime.datetime(2006, 5, 4, 10, 31, 30), 1163673536L, 0.0, 1, datetime.date(2005, 3, 19), 0, 0L, 0),)] I want to replace every instance of 'tooth.seiner.lan' with 'localhost'. There may be lots and lots of these entries (they're pulled from my mythtv database). I could brute-force this by rewriting the whole thing and replacing every 9th element but there has to be a better way I've looked at various search-and-replace snippets but none that address what I am trying to do --Yan *I'm not really new to python, just very very rusty. Last time I used it was about 3 years ago, and I was equally clueless -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Python: Do we have the concept of Hash in Python?
"Fredrik Lundh" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > A.M wrote: > >> This is my 1st day that I am seriously diving into Python and I have to >> finish this application by the end of today. Maybe it wasn't a good idea >> to choose the language that I don't know when I have to deliver my work >> in such short time. > > are your boss aware of this ? > > > > are your boss aware of this ? In fact my boss is quite impressed with my progress so far. I am a little confused about the fact that you got frustrated with my posts today. I am not asking for a big tutorial or deepest philosophy behind the concepts. The answer to this post could be just the word "Dictionary" which is 10 key stroke ! Does this hurt? -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
[EMAIL PROTECTED] wrote: > With all due respect to your well-deserved standing in the Python > community, I'm not convinced that equality shouldn't imply invariance > under identical operations. Doo you really want 2 == 2.0 to be False? -- Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/ San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis Without victory there is no survival. -- Winston Churchill -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter: select multiple entries in Listbox widget?
Oh, thanks a lot Rob. Bernard On 6/1/06, Rob Williscroft <[EMAIL PROTECTED]> wrote: > Bernard Lebel wrote in news:mailman.6413.1149178158.27775.python- > [EMAIL PROTECTED] in comp.lang.python: > > > Hello, > > > > Is there an option or a way to allow the selection of multiple entries > > in the Listbox widget? I could not find any, and would like to allow > > the end user to select multiple entries. > > > > > > When configuring use: > > selectmode = "multiple" > > e.g.: > > import Tkinter as tk > > root = tk.Tk() > > a = tk.Listbox( root, selectmode = "multiple" ) > for i in range(10): > a.insert( i, str(i) + " item" ) > > a.pack() > root.mainloop() > > I found the answer here: > > http://www.python.org/doc/life-preserver/ClassListbox.html > > Though I had to guess the `= "multiple"` part. > > Rob. > -- > http://www.victim-prime.dsl.pipex.com/ > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
Yes (unless I was testing the assertion that the second envelope did not contain counterfeits of the first) Scott David Daniels wrote: > Would you say that envelope containing five $100 bills is equal to > an envelope containing five $100 bills with different serial numbers? -- http://mail.python.org/mailman/listinfo/python-list
Re: how to print newline in xml?
I use Python/XML packages are xml.dom.minidom and xml.dom.ext (second just for PrettyPrint) -- http://mail.python.org/mailman/listinfo/python-list
if not CGI:
I've never done anything on the web. I mean, never developed anything. (I've got accounts on dA and wikipedia and half-a-dozen other things; I know HTML and enough JavaScript to hack away at it when friends need help). Mostly because I've never had anything worth doing: I've written a set of python CGI programs (an eCards site) and set up apache, just because I wanted to learn how. It used raw files; no database. And it sits there, working just about flawlessly, at http://localhost/maxecards/. I've even done a minor security audit, just to learn how (I met a hacker and he impressed me). But now I'm ready to do it in the real world. Nothing complicated, but a real project. And I have to choose my tools. Zope, Plone, Django, what are these? I don't have to stick with Python, although it's my preferred language. I know Python, Java and C++. But I'm ready to learn Ruby if RoR is as good as they say. I could do it in Python cgi (or mod_python). But it seems from all the hype that this is not a good way to write scaleable, extensible web applications. There's a reason I'm asking here: I like Python. But I only learned it because I had incentive (3 local monetary units in the computer olympiad; I won 1). Is RoR incentive enough? --Max -- http://mail.python.org/mailman/listinfo/python-list
Re: An oddity in list comparison and element assignment
Considering the number of new programmers who get bit by automatic coercion, I wish Dennis Ritchie had made some different choices when he designed C. But then I doubt he ever dreamed it would become so wildly successful. Being a curmudgeon purist I'd actually prefer it if Python raised a TypeError on float vs integer comparisons. Cheers, Mike Kent Johnson wrote: > [EMAIL PROTECTED] wrote: > > Hi Alex, > > With all due respect to your well-deserved standing in the Python > > community, I'm not convinced that equality shouldn't imply invariance > > under identical operations. > > > > Perhaps the most fundamental notion is mathematics is that the left and > > right sides of an equation remain identical after any operation applied > > to both sides. Our experience of the physical world is similar. If I > > make identical modifications to the engines of two identical > > automobiles, I expect the difference in performance to be identical. > > If my expectation is met, I would assert that either the two vehicles > > were not identical to begin with or that my modifications were not > > performed identically. > > But programming is not mathematics and assignment is not an equation. > How about this: > > In [1]: a=3.0 > > In [2]: b=3 > > In [3]: a==b > Out[3]: True > > In [4]: a/2 == b/2 > Out[4]: False > > Kent -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Python: Do we have the concept of Hash in Python?
"Fredrik Lundh" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > A.M wrote: > >> This is my 1st day that I am seriously diving into Python and I have to >> finish this application by the end of today. Maybe it wasn't a good idea >> to choose the language that I don't know when I have to deliver my work >> in such short time. > > are your boss aware of this ? > > > > are your boss aware of this ? What is wrong with *this*? Yes, they are aware of *this*. The application is not mission critical system. It is just a simple reporting tool. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best Python Editor
Fredrik Lundh napisał(a): >>Can anyone tell me a good python editor/IDE? > > vim! jEdit! >>It would be great if you can provide the download link also. > > google it! google it! :D(I love these Vim <-> Emacs disputes) -- Jarek Zgoda http://jpa.berlios.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Using print instead of file.write(str)
A.M a écrit :
> Hi,
>
>
> I found print much more flexible that write method. Can I use print instead
> of file.write method?
>
f = open("/path/to/file")
print >> f, "this is my %s message" % "first"
f.close()
To print to stderr:
import sys
print >> sys.stderr, "oops"
FWIW, you and use string formating anywhere, not only in print statements:
s = "some %s and % formating" % ("nice", "cool")
print s
You can also use "dict formating":
names = {"other": "A.M.", "me" : "bruno"}
s = "hello %(other)s, my name is %(me)s" % names
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Re: How to format datetime values
"BartlebyScrivener" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Are you trying to get banned, or what? > > It's the equivalent of me asking you: > > Hey, does Ruby have anything like dictionaries and will you teach me > about strings? Oh, and what's an object? > > Go read the bleeping tutorial. > > rd > Well, I did investigate all tutorial and google and I wasn't able to find any built-in way for datetime formatting in Python. In fact I cannot find any way to format a long integer into 99,999, format. I know how to format strings with C printf like formatter, but I am sure what I am trying to do can't be done with C printf formatting. I also found that mx.DateTime perfectly does date formatting and much more, but I don't want to add another step to the deployment process. >> It's the equivalent of me asking you: >> and will you teach me about strings? Oh, and what's an object? The answer to this post could be just a function name. I don't think I asked about broad concepts such as the object or strings. What I am asking here is just a clue. -- http://mail.python.org/mailman/listinfo/python-list
