Re: why in returns values for array and keys for dictionary
On Aug 26, 10:49 am, ++imanshu [EMAIL PROTECTED] wrote:
Hi,
Wouldn't it be nicer to have 'in' return values (or keys) for both
arrays and dictionaries.
NO!
When you iterate over a list (or even a array) it is the members of
the list in the order they appear that is of interest. When you
iterate over a dictionary it is the relationship between the (unique)
key and the (possibly non-unique) value that is of interest. Moreover
the sequence of values in a dictionary lacks meaning.
What is the 'key' of a list? It's index? It would be cumbersome to
iterate over the range(len(list)) and then have to use the index
values to pull out the values from that list. On the otherhand it
would be useless for 'in' (in the sense of for x in {...}) to return a
series of unordered values, with no way to get at the key, rather than
keys (from which the values are directly accessible).
And what would you like file_like objects, for example, to return?
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Re: Equivalents of Ruby's ! methods?
On Aug 26, 9:47 am, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Mon, 25 Aug 2008 17:04:07 +, Grzegorz Staniak wrote: On 25.08.2008, Terry Reedy [EMAIL PROTECTED] wroted: The newish sorted() and reversed() built-ins were meant to complement list.sort and list.reverse, not replace them. BTW, is there a reason why sorted() on a list returns a list, while reversed() on the same list returns an iterator? Until the day that somebody discovers how to sort a list without seeing all the items first, there's no point in sorted() returning an iterator. To nitpick, this is not strictly true: sure, you're at best O(nlogn) on sorting the entire list, but you could return the first element of the 'sorted' list in O(n) (if you don't mind using a O(n^2) algorithm for the whole sort). i.e. if you have a use case where you're only likely to look at the first few elements of a sorted list, it would make some sense to have an iterator. -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help with extension modules built in debug mode
[EMAIL PROTECTED] wrote: I've come to the conclusion that posting about Embedded Python on the Python forums is a complete waste of time. I hope I can get some useful insights here. (just curious, but what are the Python forums? isn't the newsgroup/mailing list *the* Python forum?) /F -- http://mail.python.org/mailman/listinfo/python-list
Non-evil multithreaded WSGI server?
In a recent experiment I've done this: from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler from wsgiref.simple_server import make_server, demo_app from SocketServer import ThreadingMixIn # Let's make a WSGI server that can use multiple threads. class ThreadedHTTPServer(ThreadingMixIn, HTTPServer): Handle requests in a separate thread. # Evil! ;-) from wsgiref.simple_server import WSGIServer as MyWSGIServer MyWSGIServer.__bases__ = (ThreadedHTTPServer,) Now I wonder if there's a less evil way that does not involve copy paste of the WSGIServer code (only couple of lines, but I hate duplication)?! -- Gerhard -- http://mail.python.org/mailman/listinfo/python-list
Re: rspec for python
Gerhard Haring wrote: Have you actually used this rspec thing in Ruby? I always wonder with such things. Same with all the other hyped technologies of yesteryear. Anybody out there who really uses model-driven development? -- Gerhard Two laws are (the) most fundamental in our field. 1. The Church-Turing thesis says that all computable systems (aka prog languages and their spinoffs) are equivalent 2. Wittgenstein's The limits of my language are the limits of my world says that significant differences in computing power are (ultimately) differences in language. Hence what a language can (and cannot) do are always of deep interest. Specifically: whether rpsec works -- I dont know -- Ive not used it. There are attempts in the python world: specipy and pyspec but they dont seem mature yet. I am also interested in what Joh says Compare Rake and Scons - the Ruby and Python embedded DSL build systems that are intended to replace Make, Ant and similar external build DSLs. You can see the difference in fluency. What is the difference? And how much is due to the relatively greater maturity of rake and how much due to the intrinsic differences of python and ruby? Anyhow which due you prefer? -- http://mail.python.org/mailman/listinfo/python-list
Re: python xslt library
Owen Zhang wrote: Can anyone recommand the best performance python xslt library? lxml. It's based on libxml2/libxslt. http://codespeak.net/lxml Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: File copying from a menu
Brandon wrote: I'm attempting to have a file copied from a menu selection. The menu already exists, but it won't even create the menu item. If anyone has any ideas, please let me know. try cutting down your code to a minimal example that illustrates the problem, and post that code (that'll also allow us to figure out what library you're using to create the menu...). /F -- http://mail.python.org/mailman/listinfo/python-list
mailbox module
Hi all. I am trying to use mailbox module, mbox class like this:
import mailbox
m1 = mailbox.mbox('./ra9ftm2')
But it gives the following:
ra9ftm:/home/ra9ftm/pyemail# python mbox1.py
Traceback (most recent call last):
File mbox1.py, line 2, in ?
m1 = mailbox.mbox('./ra9ftm2')
AttributeError: 'module' object has no attribute 'mbox'
ra9ftm:/home/ra9ftm/pyemail#
What's wrong?
I am using Debian 4.0 Etch for my tests. May be old version of python
in this repository?
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Re: why in returns values for array and keys for dictionary
Marc 'BlackJack' Rintsch wrote:
On Mon, 25 Aug 2008 19:57:06 -0700, alex23 wrote:
On Aug 26, 10:49 am, ++imanshu [EMAIL PROTECTED] wrote:
Wouldn't it be nicer to have 'in' return values (or keys) for
both
arrays and dictionaries. Arrays and Dictionaries looked so similar in
Python until I learned this difference.
[…]
In both cases, 'in' returns a boolean indicating the existence of an
item in the list, or a key in the dict. I'm not sure why you'd need it
to return the item you're checking for the existence of, as you'd have
to have that item before you could do the check.
Have I missed what you're asking for here? Could you provide a
pseudocode example to demonstrate what you mean?
The OP isn't talking about the ``in`` operator but ``in`` as part of
``for … in …``. So it's actually the question why ``list(a_dict)``
doesn't return a list of values but a list of keys.
That is basically the same question. Iterating over a list gives you
its elements, and using the `in` operator with lists tells you whether
or not an object is an element of the list. Iterating over a dictionary
gives you its _keys_, not its values, and the `in` operator with
dictionaries tells you whether or not a _key_ is in the dictionary.
l = [1, 2, 3]
for x in l: print x
...
1
2
3
0 in l
False
1 in l
True
d = {'a': 1, 'b': 2, 'c': 3}
for x in d: print x
...
a
c
b
'a' in d
True
1 in d
False
The reason why people find it more useful to deal with keys rather than
values of a dictionary during iteration or containment testing is ...
because that tends to be what you're usually more interested in, and is
more efficient. For another thing, if you're doing a lot of testing for
containment in values, then it's likely you're not using the right data
structure, or combination of data structures. That's not what
dictionaries are for.
--
Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/
San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis
Well I have been puppetized / Oh how I have compromised
-- Lamya
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Re: why in returns values for array and keys for dictionary
++imanshu wrote: Wouldn't it be nicer to have 'in' return values (or keys) for both arrays and dictionaries. Arrays and Dictionaries looked so similar in Python until I learned this difference. It's because dealing with keys makes far more sense, since that's how the dictionary data structure works. If you're doing this an awful lot -- whether testing for inclusion or iterating -- then you're probably using the wrong data structure. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis Well I have been puppetized / Oh how I have compromised -- Lamya -- http://mail.python.org/mailman/listinfo/python-list
Re: Micro-threading PEP proposal announcement
Sorry Bruce, When can I read this PEP ? I'm interesting Bye On Mon, Aug 25, 2008 at 7:15 PM, Bruce Frederiksen [EMAIL PROTECTED]wrote: I wanted to make everybody aware that I've posted a (rather long and involved) PEP proposal for adding micro-threading to Python on python-ideas for feedback and review. In a nutshell, this proposal implements the Twisted Deferred/Reactor at the C level so that the Python programmer gets the advantages that Twisted offers without having to write their code in an event driven style. Thus, legacy Python code not written in the Twisted style (Django, TurboGears, WSGI apps) will gain the benefits of Twisted with almost no additional work. This PEP provides similar benefits to GUI toolkits where, again, Python programmers have been faced with event driven programming. So using this PEP, GUI toolkits could hide this event driven programming from the Python programmer, making GUI programming much easier. For example, you would no longer have to use a modal dialog just to make the programming easier. The C-level Deferreds and Reactor are not made visible to the Python programmer (as they are in Twisted). Rather, what is visible is a very simple micro-thread that allows for start_and_forget threads, parallel threads (where you're only interested in the final return value) and fully cooperative threads communicating over micro-pipes (which, BTW, gives us a new way to write generators that allows one generator to simply call another one to have the second generator's output included with its own output without having to capture and pass back values). As there is a great deal of traffic on comp.lang.python, I don't expect to be able to keep up with the posts here and would prefer to discuss this on python-ideas... If there is any interest in this, please let me know! If I don't see any interest, I'll assume that it's not solving a real problem and will let it quietly die on the vine... Thank you for your attention! -bruce -- http://mail.python.org/mailman/listinfo/python-list -- Pau Freixes Linux GNU/User -- http://mail.python.org/mailman/listinfo/python-list
Re: mailbox module
ok, may be it is truth, because class UnixMailbox is working. I found it in Depricated classess and methods in manual :( here is only version 2.4 in Debian ra9ftm: I am using Debian 4.0 Etch for my tests. May be old version of python in this repository? -- http://mail.python.org/mailman/listinfo/python-list
How to manipulate list of dictionary
Hi,
Need some help, I have a list of dictionary as below,
table = [{Part #:Washer,Po #:AE00128,qty:100},
{Part #:Brake Pad,Po #:AE00154,qty:150},
{Part #:Mesh,Po #:AE00025,qty:320},
{Part #:Mouse,Po #:AE00207,qty:120},
{Part #:Insulator,Po #:AE0013,qty:190}]
How to manipulate the table?
I need to search for the Po #, and display the result as below.
Part # : Mouse
Po # : AE00207
Qty: 120 pcs
Regards,
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Re: smart quotes
Adrian Smith wrote: Can anyone tell me how to get rid of smart quotes in html using Python? I've tried variations on stuff = string.replace(stuff, \“, \), but to no avail, presumably because they're not standard ASCII. Convert the string to unicode. For that you have to know its encoding. I assume UTF-8: s = a “smart quote” example u = s.decode(utf-8) Now you can replace the quotes (I looked up the codes in wikipedia): u.replace(u\u201c, ).replace(u\u201d, ) u'a smart quote example' Alternatively, if you have many characters to remove translate() is more efficient: u.translate(dict.fromkeys([0x201c, 0x201d, 0x2018, 0x2019])) u'a smart quote example' If necessary convert the result back to the original encoding: clean = u.translate(dict.fromkeys([0x201c, 0x201d, 0x2018, 0x2019])) clean.encode(utf-8) 'a smart quote example' Peter -- http://mail.python.org/mailman/listinfo/python-list
Are dictionaries the same as hashtables?
Are dictionaries the same as hashtables? -- http://mail.python.org/mailman/listinfo/python-list
How to bind an event in Tix combo box?
Hi, I'm a newbie and created a new combo box with Tix. The combo box is filled with the required items. I've used Tkinter's listbox and used the ListboxSelect event and bind that with a callback. Now, I want to do the same stuff with the Tix combo box. Please suggest how can I do the same in Tix combo box. Thanks and regards, Rajat -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. PS: your sig was *a bit* longer than you question. please don't do that... signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
On Aug 26, 9:43 am, Martin Marcher [EMAIL PROTECTED] wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. PS: your sig was *a bit* longer than you question. please don't do that... signature.asc 1KViewDownload my what? -- http://mail.python.org/mailman/listinfo/python-list
Re: extract text from ods TableCell using odfpy
Ok. Sorted it out, but only after taking a round trip over xml.minidom. Here's the working code: #!/usr/bin/python from odf.opendocument import Spreadsheet from odf.opendocument import load from odf.table import TableRow,TableCell from odf.text import P doc = load(/tmp/match_data.ods) d = doc.spreadsheet rows = d.getElementsByType(TableRow) for row in rows[:2]: cells = row.getElementsByType(TableCell) for cell in cells: tps = cell.getElementsByType(P) if len(tps) 0: for x in tps: print x.firstChild -- http://mail.python.org/mailman/listinfo/python-list
ctypes - loading 'librsvg-2-2.dll'
Any ideas why a particular dll won't load on Windows XP Pro using ctypes? The dll in question is 'librsvg-2-2.dll' (a link if anyone cares to try!!! http://ftp.gnome.org/pub/gnome/binaries/win32/librsvg/2.22/) The other dlls from the GTK libraries seem to load okay, so I'm more than puzzled!! I get the following results (whichever class I use): l=CDLL(r'D:\SILSign\librsvg-2-2.dll') Traceback (most recent call last): File input, line 1, in module File C:\PYTHON25\LIB\ctypes\__init__.py, line 349, in __init__ self._handle = _dlopen(self._name, mode) WindowsError: [Error 127] The specified procedure could not be found Best regards, Tim -- http://mail.python.org/mailman/listinfo/python-list
Re: How to manipulate list of dictionary
2008/8/26 ajak_yahoo [EMAIL PROTECTED]:
Need some help, I have a list of dictionary as below,
table = [{Part #:Washer,Po #:AE00128,qty:100},
{Part #:Brake Pad,Po #:AE00154,qty:150},
{Part #:Mesh,Po #:AE00025,qty:320},
{Part #:Mouse,Po #:AE00207,qty:120},
{Part #:Insulator,Po #:AE0013,qty:190}]
How to manipulate the table?
I need to search for the Po #, and display the result as below.
Part # : Mouse
Po # : AE00207
Qty: 120 pcs
Well, that's a really bad data structure for what you want to do, but
you can do it with something like (untested):
wanted = 'AE00207'
for part in table:
if part['Po #'] == wanted:
print Part #:\t%(Part #)s\nPo #:\t%(Po #)s\nQty #:\t%(qty)s % part
--
Cheers,
Simon B.
[EMAIL PROTECTED]
http://www.brunningonline.net/simon/blog/
GTalk: simon.brunning | MSN: small_values | Yahoo: smallvalues | Twitter: brunns
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Re: property() usage - is this as good as it gets?
David Moss a écrit : Hi, I want to manage and control access to several important attributes in a class and override the behaviour of some of them in various subclasses. Below is a stripped version of how I've implemented this in my current bit of work. It works well enough, but I can't help feeling there a cleaner more readable way of doing this (with less duplication, etc). Is this as good as it gets or can this be refined and improved especially if I was to add in a couple more attributes some fairly complex over-ride logic? (snip code) Remember that properties have nothing magical - they're just one possible (and very handy) way to use the descriptor protocol to implement computed attributes. If you have to resort to any non-obvious trick or just too much boilerplate code with properties, then it's probably time to implementent your own custom descriptor object. -- http://mail.python.org/mailman/listinfo/python-list
Re: rules of thumb for cross os code
DwBear75 a écrit : I am considering using python as a replacement for a lot of bash scripting that I have been doing. I would like to be as cross platform as possible, writing scripts for both windows and linux. Are there any guides are general rules of thumb on 1) keeping code os independant obvious Use os.path, avoid any os-specific module. /obvious 2) nifty lambda's or other things to create functions fit for the environment You don't need lambdas here. import random some_condition = random.choice((True, False)) if some_condition: def myfunc(): print myfunc for 'somecondition==True' else: def myfunc(): print myfunc for 'somecondition==False' -- http://mail.python.org/mailman/listinfo/python-list
Retrieve Win32 domain name
I'm looking for a method to retrieve a Windows Domain name (not a DNS Domain name). I know this can be done by simply reading an environment variable, however on the machines I need to work with sometimes the environment variables can be messed-up and are not trustworthy. Is there somebody who knows the Win32 library who can point me to the function I need? The Win32Net seems to contain a whole load of functions for manipulating Windows networking resources, however I couldn't find a function which simply returned information about the local computer. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Retrieve Win32 domain name
I'm looking for a method to retrieve a Windows Domain name (not a DNS Domain name). I know this can be done by simply reading an environment variable, however on the machines I need to work with sometimes the environment variables can be messed-up and are not trustworthy. Is there somebody who knows the Win32 library who can point me to the function I need? The Win32Net seems to contain a whole load of functions for manipulating Windows networking resources, however I couldn't find a function which simply returned information about the local computer. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Python String Immutability Broken!
Simon Brunning: You can indeed use ctypes to modify the value of a string - see http://tinyurl.com/5hcnwl. You can use it to crash the OS, too. My advice - don't. Thanks for the link. Any advice on what to do or use as an I/O structure for dissemination? Ken Seehart: 8--- using ctypes to make 1+14 = 10 -- I love ctypes. So cool. It's not supposed to be safe. And here I thought I was weird… Life is either a daring adventure or nothing. Security does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than exposure. *Helen Keller http://www.quotationspage.com/quotes/Helen_Keller/* /US blind deaf educator (1880 - 1968)/ Of course I would not hire anyone who believes this quote, other than Helen Keller, if she were still with us. Why not? – as I see it, the Keller quote states the literal truth of the matter – we all live under an illusion of security – but then that might just be because I am South African, and the country is run by cattle thieves. It is quite possible to write a small program that works using abused strings. But my life better not depend on it. Among other things, if you use the abused string as a key anywhere, you will not get correct results. Trying to change the length of the string will cause disasters. Lengthening a string will corrupt memory, and shortening the string will not shorten it but rather embed '\0' in it. Understood. – remember I am using it as a kind of array of “pseudoports” - memory representations of what goes on on wires on the outside. So only a real madman would try to impute the kind of cross bit correlation needed to use the bunch of bits as a key. The length would be fixed, governed by the existence of real hardware on the outside. Ken Seehart again: Yes, there is a better way. Use a character array instead of a string. The original reason I used a string directly instead of array.array was to try to skip the serialisation step when disseminating the information via sockets. As you can appreciate, this is all “hot stuff” as it represents said wire states, and is of interest system wide. So lets explore this further – lets say I use two arrays – one to represent the stuff that must be output, and one to represent the latest inputs read. Then, I think, first prize would be the ability to “publish” that information as a shared memory block, that can be accessed by other python processes. Then it will be possible to a priori “chop up the ownership” of the various bits, so that a process can simply monitor the bits of interest to it, setting or clearing the bits of the outputs it is responsible for. In this way the work could be divided amongst many processes. Then, on a periodic basis, the I/O would be done, much like one would do it in an embedded system using an interrupt driven ticker routine. That would be really cool. Does anybody know how to get such memory sharing done in Python? (Linux only) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: setattr and getattr, when to use?
Jason Scheirer a écrit : (snip) The 5% of your time when you are doing metaprogramming or other abuses of the object system are when you use get/setattr. What makes you label metaprogramming and get/setattr as abuses ??? -- http://mail.python.org/mailman/listinfo/python-list
Re: Total No. of Records in a File?
W. eWatson a écrit : I have an ordinary text file with a CR at the end of a line, and two numbers in each line. Is there some way to determine the number of lines (records) in the file before I begin reading it? How could you know how many times a given character appears in file without reading the whole file ? You could of course store metadata about one file in another file[1], but then you'd have to read and parse this other file, and it might go out of sync. [1] or at the begining of your 'data' file - but you still have to rad at least this part, and you still have the potential sync problem. Or you could use a fixed-size binary format for your records, and try dividing the file size by the record size. What's your concrete use case, exactly ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Total No. of Records in a File?
W. eWatson a écrit : Fredrik Lundh wrote: W. eWatson wrote: I have an ordinary text file with a CR at the end of a line, and two numbers in each line. Is there some way to determine the number of lines (records) in the file before I begin reading it? In the general case, no. A file is just a bunch of bytes. If you know that all lines have exactly the same length, you can of course fetch the file size and divide by the line size, but that doesn't work for arbitrary files. Why do you need to know the number of lines before reading it, btw? /F Actually, it was a matter of curiosity, and maybe absent mindedness. I was envisioning a program where I might want to run up and down a file a lot, sometimes deleting a record interactively at the request of the user. However, I wanted to keep him alert to the total number of records remaining. However, in retrospect, I more likely do this with files in a folder. I also want him to be able to skip around in the Win OS folder by saying something like go forward 3 files. I'd like not to have to read all the files between the two points. The whole idea needs some more thinking. The whole idea is that you should learn what a DBMS is good for, IMHO. -- http://mail.python.org/mailman/listinfo/python-list
Re: A variables variables
castironpi a écrit :
On Aug 23, 7:25 pm, Gandalf [EMAIL PROTECTED] wrote:
how can I declare a variable with another variable name?
for example I will use PHP:
$a= hello;
$a_hello=baybay;
print ${'a_'.$a) //output: baybay
how can i do it with no Arrays using python
thanks!
Here's one idea.
a= 'hello'
a_hello= 'bayb'
print eval( 'a_'+ a )
bayb
Please avoid this kind of yucky ugly hacks.
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Re: What is class method?
MeTheGameMakingGuy a écrit : On Aug 24, 6:32 pm, Hussein B [EMAIL PROTECTED] wrote: Hi, I'm familiar with static method concept, but what is the class method? how it does differ from static method? when to use it? -- class M: def method(cls, x): pass method = classmethod(method) -- Thank you for your time. Firstly, don't use method = classmethod(method). Decorators are far better. The following code has the same effect: class M: @classmethod def method(cls, x): pass Far more readable, right? Yes, but will only work with Python = 2.4. There are cases where you want to keep compatibility with Python 2.3... Class methods are useful if you've got lots of inheritance happening. The first argument passed in is the class calling the method. Handy for a mix-in: it can add methods affecting the actual class it's mixed into, rather than messing with the mix-in itself. I'm not sure I get your point here. As far as I'm concerned, classmethods are useful anywhere you need to work on the class object itself. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is class method?
Maric Michaud a écrit : (snip) It is a common advice that staticmethod should not exist in python, as they do nothing compared to module level functions, They do nothing more, but are accessible thru a class object instead of being accessible thru a module object. It sometimes happens to be useful (for a very very low value of 'sometimes' as far as I'm concerned, but still...) -- http://mail.python.org/mailman/listinfo/python-list
Re: why in returns values for array and keys for dictionary
On Aug 26, 11:52 am, Erik Max Francis [EMAIL PROTECTED] wrote: ++imanshu wrote: Wouldn't it be nicer to have 'in' return values (or keys) for both arrays and dictionaries. Arrays and Dictionaries looked so similar in Python until I learned this difference. It's because dealing with keys makes far more sense, since that's how the dictionary data structure works. If you're doing this an awful lot -- whether testing for inclusion or iterating -- then you're probably using the wrong data structure. Thanks for the detailed replies. Python seems to be taking the pragmatic approach here instead of the pure one. And yes it makes more sense. Thanks, ++imanshu -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 18 N 121 57 W AIM, Y!M erikmaxfrancis Well I have been puppetized / Oh how I have compromised -- Lamya -- http://mail.python.org/mailman/listinfo/python-list
Re: generate methods at runtime, but the wrong one gets called
Maric Michaud a écrit : (snip) i don't get your design, it seems over-complicated to mee at first glance. aol / -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
On Aug 26, 5:43 pm, Martin Marcher [EMAIL PROTECTED] wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. Please clarify: (1) Nothing in where? In the Python dictionary implementation? (2) What do you mean by sane collision handling? What do you mean by simply overwriting? TIA, John -- http://mail.python.org/mailman/listinfo/python-list
Re: How to manipulate list of dictionary
Simon Brunning a écrit :
2008/8/26 ajak_yahoo [EMAIL PROTECTED]:
Need some help, I have a list of dictionary as below,
table = [{Part #:Washer,Po #:AE00128,qty:100},
{Part #:Brake Pad,Po #:AE00154,qty:150},
{Part #:Mesh,Po #:AE00025,qty:320},
{Part #:Mouse,Po #:AE00207,qty:120},
{Part #:Insulator,Po #:AE0013,qty:190}]
How to manipulate the table?
I need to search for the Po #, and display the result as below.
Part # : Mouse
Po # : AE00207
Qty: 120 pcs
Well, that's a really bad data structure for what you want to do, but
you can do it with something like (untested):
wanted = 'AE00207'
for part in table:
if part['Po #'] == wanted:
print Part #:\t%(Part #)s\nPo #:\t%(Po #)s\nQty #:\t%(qty)s % part
Which will not be very efficient if you happen to have lot of items in
your list and or a lot of searches to do.
The next solution is to maintain an index, ie:
def make_index(table, key):
index = {}
for record in enumerate(table):
index.setdefault(record[key], []).append(record)
return index
po_index = make_index(table, Po #)
results = po_index.get('AE00207', None)
But this won't scale up if you have millions of records. So the next
next solution is to use a true database - either a RDBMS, or an embedded
one like SQLite.
--
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Re: Are dictionaries the same as hashtables?
Martin Marcher wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. The term collision is rather well defined when talking about associative arrays using hashing (which python's dicts are): it means that two distinct keys produce the same hash-value, leading to a bucket collision. And of course python deals with that sanely, and creates a list of objects inside the bucket which is traversed and comparison is used to determine which actual value to retrieve. Python does not have a one key maps to a list of values-semantics - which I consider the sane choice... However, you can have that using the defaultdict for example: listdict = defaultdict(list) listdict[key].append(value) Diez -- http://mail.python.org/mailman/listinfo/python-list
logging exceptions
why doesn't logging throw any exception when it should? how do I
configure logging to throw exceptions?
try:
... logging.fatal('asdf %d', '123')
... except:
... print 'this line is never printed'
...
Traceback (most recent call last):
File /Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/logging/__init__.py, line 744, in emit
msg = self.format(record)
File /Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/logging/__init__.py, line 630, in format
return fmt.format(record)
File /Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/logging/__init__.py, line 418, in format
record.message = record.getMessage()
File /Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/logging/__init__.py, line 288, in getMessage
msg = msg % self.args
TypeError: int argument required
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Python LDAP
Hi I am trying to make a simple Python script using LDAP. The module is imported OK, but when I call the function open or initialize, I get this error: Traceback (most recent call last): File /home/juan/workspace/amquare/src/nutum/amquare/amquare.py, line 122, in module conn.connect() File /home/juan/workspace/amquare/src/nutum/amquare/ldap_util.py, line 39, in connect self.conn = ldap.initialize(self.host, self.port) File /usr/lib/python2.5/site-packages/ldap/functions.py, line 87, in initialize return LDAPObject(uri,trace_level,trace_file,trace_stack_limit) File /usr/lib/python2.5/site-packages/ldap/ldapobject.py, line 70, in __init__ self._l = ldap.functions._ldap_function_call(_ldap.initialize,uri) File /usr/lib/python2.5/site-packages/ldap/functions.py, line 59, in _ldap_function_call result = func(*args,**kwargs) LDAPError: (2, 'No such file or directory') What file is not found? I have lots of searches but don't get any answer. Anyone know how to solve this? Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
cnb [EMAIL PROTECTED] writes: Are dictionaries the same as hashtables? The 'dict' type in Python has certain behaviour, as specified in the language reference. In CPython they are implemented as hash tables, but I don't recall anything that specifies they *must* be implemented that way. So my answer would be maybe, but don't count on it. Write your program to the specified behaviour of the language, not to the underlying implementation. -- \“With Lisp or Forth, a master programmer has unlimited power | `\ and expressiveness. With Python, even a regular guy can reach | _o__) for the stars.” —Raymond Hettinger | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Is my thinking Pythonic?
Fredrik Lundh a écrit : Bruno Desthuilliers wrote: Given the lack of proper support for the descriptor protocol in old-style classes and a couple other diverging behaviors, I wouldn't say that advising newcomers to use new-style classes is so pointless. Yeah, but if you don't need descriptors, new-style classes don't buy you anything Except being python-3000 ready wrt/ diverging behavious - like overriding __magic__ methods on a per-instance basis. Ok, this is certainly not a very common case, but still we've seen questions about this on this ng... (except a slight slowdown in certain situations). Dogmatic dogmatic ??? use of new-style classes (or any other new feature) isn't pythonic. You're right to quote the word new here - how many years since Python grew a new object model explicitely intended to replace the original one ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Overwriting property- can't set attribute
norseman a écrit : Gregor Horvath wrote: Hi, why is this code failing? class B(object): pass B.testattr = property(lambda s:hallo) b = B() b.testattr = test Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) /tmp/python-14202ViU.py in module() 14 B.testattr = property(lambda s:hallo) 15 b = B() --- 16 b.testattr = test 17 18 type 'exceptions.AttributeError': can't set attribute -- Greg -- http://mail.python.org/mailman/listinfo/python-list b = B() # synonyms Not exactly, no. You probably missed the call operator applied to B. (snip erroneous explanation). -- http://mail.python.org/mailman/listinfo/python-list
Re: Overwriting property- can't set attribute
Gregor Horvath a écrit : Hi, why is this code failing? class B(object): pass B.testattr = property(lambda s:hallo) b = B() b.testattr = test Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) /tmp/python-14202ViU.py in module() 14 B.testattr = property(lambda s:hallo) 15 b = B() --- 16 b.testattr = test 17 18 type 'exceptions.AttributeError': can't set attribute It's not failing, it's doing exactly what's expected. You made testattr a read-only property by not providing a setter. -- http://mail.python.org/mailman/listinfo/python-list
Ctypes module - looking for a way to dynamically call exported function from a set of dlls
Hi, I'm using the ctypes module to load my dlls. I have some 10 dlls the names of those are passed to a fucntion which then loads the passed dll. Now every dll has a getversion function. eg: A.dll, B.dll, C.dll are the dlls and GetVersion functions are as: A_getVersion(), B_getVersion(), C_getVesion() The functionality I'm lookking for is that depending on the dll passed the right getVersion should be passed. I'm able to load the all the dlls passed to the function but I'm not able to call the function names dynamically Please help Regards, Rajat -- http://mail.python.org/mailman/listinfo/python-list
RPCXML hide implementation.
Hi I'm working recently with XMLRPC for python and It never was so easy. But I've meet a obstacle. Because python is not giving us any reasonable encapsulation mechanism, I have problems with hiding some part of the implementation. When class has 2 methods and I want to make rpc private only ONE of them. I can always use __name. But what in case when I really need to use those two methods inside other class as a public, but not by RPC Simple code: class RpcClass: def one(self): #visible by RPC, available as public for other class return one def two(self): #INVISIBLE by RPC, available as public for other class return two Server.register_instance(RpcClass()) Thanks -- http://mail.python.org/mailman/listinfo/python-list
properties with subscripted variables
Hi, I work on the python module AVC (http://avc.inrim.it) useful for the development of applications with GUIs. AVC is based on the property mechanism: any a variable controlled by AVC is set as a property, so when it is assigned by the application program, the __set__ function is called and AVC does its job. This works fine with non sequence types and with sequence types when are assigned as a whole, without subscripting. When the assignment has a subscript, the __set__ method is no more called. This is a limitation from the point of view of AVC. My goal would be to be able to intercept (trigger a call to a method of my module) any kind of variable assignment, even if it is a sequence type with a subscript. There is a way to reach this result with properties or with other ways? Best regards, F. Pollastri -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Strinh Immutability Broken!
Gabriel Genellina: To avoid altering the equilibrium of the whole universe, use ctypes.create_string_buffer: http://python.net/crew/theller/ctypes/tutorial.html#fundamental-data-types Thanks Gabriel – looks like I really have to spend more time with that excellent document. Patrick Maupin: Whenever I do low-level stuff like this, I'm in one of two modes: Mode #1: I'm using somebody else's C library and the overhead of doing so is small. Mode #2: I need to code my own low-level stuff (for speed, IO access, whatever). This seems to be where I am at. In mode 1, I try not to break out a compiler. ctypes is great for this, and the results are pure python to the extent that you can give pure python to someone else with the same C library, and it will work. No muss, no fuss, no makefile, no question that ctypes is awesome stuff. In mode 2, I have to break out a compiler. I almost never do this without ALSO breaking out Pyrex. Pyrex is also awesome stuff, and in Pyrex, you can easily create a (new) Python string for your results without having to worry about reference counting or any other really nasty low level interpreter details. You can code a lot of stuff in pure Pyrex, and you can easily mix and match Pyrex and C. Pyrex and ctypes are both tools which let me connect to non-Python code without having to remember to handle Python interpreter internals correctly. If I can get by with ctypes, I do, but if I actually have to code in something other than Python to get the job done, I bypass ctypes and go straight for Pyrex. Don’t know anything about Pyrex except that it is not in the standard library on Suse – will try to read up on it. Thanks. Terry Reedy: http://python.net/crew/theller/ctypes/tutorial.html#arrays Which essentially is the bytearray type of 3.0. How does it differ from plain old array.array(b,”The quick brown fox”)? - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Libraries for internal SOA components
Hi. I'm looking for libraries for implementing SOA components (not necessery web services). Most of the components are not communicating with the world. Language independence is not very important (Python is everywhere :). Important requirement is ability to process requests in parallel, and because we (of course) use CPython then simple threading is not sufficient. The solution with XMLRPC server from stdlib with ForkingMixin works, but it seems it's not suited for production use. It has the disadvantage of supporting simple types only. Pyro supports all Python types but uses threading for parallelization only I think. This could be overcomed of course (eg. using 'processing' package and worker processes), but anybody uses Pyro for SOA? Another option is to jump into Twisted world, but I would rather use a library that I can use like I want than a framework. Anyway it seems that even in Twisted I have to program parallelization by myself, like in this example: http://www.artima.com/weblogs/viewpost.jsp?thread=230001 . Any hints or advices? :) -- http://mail.python.org/mailman/listinfo/python-list
Setting my Locale
Good morning Guys, I'm running python 2.5 on a Debian based system and I'm looking for your advice on how to set the locale for my application. I've read through the locale module documentation http://docs.python.org/lib/module-locale.html and tried a couple of the examples but can't seem to get it working. For instance, when I attempt to run the following code: import locale locale.setlocale(locale.LC_ALL, 'de_DE') I get an exception raised by the application which says: Traceback (most recent call last): File locale_test.py, line 2, in module locale.setlocale(locale.LC_ALL, 'de_DE') File /usr/lib/python2.5/locale.py, line 478, in setlocale return _setlocale(category, locale) locale.Error: unsupported locale setting My questions are; what would be causing this error? Do I need any additional packages installed on the system for this locale support to work properly? How can I get a list of available locales? Many thanks for any advice guys, Robert -- http://mail.python.org/mailman/listinfo/python-list
Re: why in returns values for array and keys for dictionary
++imanshu: Wouldn't it be nicer to have 'in' return values (or keys) for both arrays and dictionaries. Arrays and Dictionaries looked so similar in Python until I learned this difference. D language works like you say, and it's awful. With a key you can find its value, but given only the value you can't find its key. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: properties with subscripted variables
Fabrizio Pollastri a écrit : Hi, I work on the python module AVC (http://avc.inrim.it) useful for the development of applications with GUIs. AVC is based on the property mechanism: any a variable controlled by AVC is set as a property, so when it is assigned by the application program, the __set__ function is called and AVC does its job. This works fine with non sequence types and with sequence types when are assigned as a whole, without subscripting. When the assignment has a subscript, the __set__ method is no more called. Nope, but the __get__ method is. This is a limitation from the point of view of AVC. My goal would be to be able to intercept (trigger a call to a method of my module) any kind of variable assignment, even if it is a sequence type with a subscript. There is a way to reach this result with properties or with other ways? The code: obj.prop[x] = y is equivalent to: prop = obj.prop prop[x] = y IOW, you just have to return from prop.__get__ a custom sequence type implementing __setitem__ the way you see fit. Also, remember that properties are just one possible way to use the descriptor protocol to implement computed attributes. You can define your own descriptor objects. HTH -- http://mail.python.org/mailman/listinfo/python-list
[ANNOUNCE] pygtkmvc-1.2.2 has been released
Version 1.2.2 of pygtkmvc has been released. Project homepage: http://pygtkmvc.sourceforge.net Download: http://sourceforge.net/projects/pygtkmvc/ == About pygtkmvc == pygtkmvc is a fully Python-based implementation of the Model-View-Controller (MVC) and Observer patterns for the PyGTK2 toolkit. MVC is a pattern that can be successfully used to design and develop well structured GUI applications. The MVC pattern basically helps in separating semantics and data of the application, from their representation. The Observer pattern helps to weaken dependencies among parts that should be separated, but need to be connected each other. pygtkmvc provides a powerful and still simple infrastructure to help designing and implement GUI applications based on the MVC and Observer patterns. The framework has been designed to be: * Essential and small, it does only what it was designed for. * Not an external dependency for your application: it fits in 80KB and can be released along with it. * Easy to understand and to use; fully documented. * Portable: straightly runs under many platforms. License: LGPL === About release 1.2.2 === This is a minor release that fixes two major bugs about adapters. A few new examples about adapters have been also added. Thanks to Alessandro Dentella sandro TA e-den TOD it for reporting both bugs. -- Roberto Cavada roboogle TA gmail TOD com PA HREF=http://pygtkmvc.sourceforge.net;pygtkmvc 1.2.2/A - Pygtk MVC is a thin, multiplatform framework that helps to design and develop GUI applications based on the PyGTK toolkit. (26-Aug-08) -- http://mail.python.org/mailman/listinfo/python-list
Re: RPCXML hide implementation.
x Simple code: x class RpcClass: x def one(self): #visible by RPC, available as public for other class x return one x def two(self): #INVISIBLE by RPC, available as public for other x class x return two x Server.register_instance(RpcClass()) Just register the method you want to publish, not the entire instance. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
On Aug 26, 7:36 pm, Diez B. Roggisch [EMAIL PROTECTED] wrote: Martin Marcher wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. The term collision is rather well defined when talking about associative arrays using hashing (which python's dicts are): it means that two distinct keys produce the same hash-value, leading to a bucket collision. And of course python deals with that sanely, and creates a list of objects inside the bucket which is traversed and comparison is used to determine which actual value to retrieve. I see neither buckets nor lists in the CPython svn trunk version of dictobject.c and IIRC it's been using open addressing for a very long time. -- http://mail.python.org/mailman/listinfo/python-list
Split function for host:port in standard lib
HI! Is there a function in the standard lib which can be used to split a string containg 'host:port' into a tuple (host,port) and also does this reliably for IPv6 addresses? Ciao, Michael. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python LDAP
Juan wrote: self.conn = ldap.initialize(self.host, self.port) [..] LDAPError: (2, 'No such file or directory') You have to pass in a LDAP URI as documented here: http://python-ldap.sourceforge.net/doc/html/ldap.html#ldap.initialize Use of compability function ldap.open() is deprecated and might vanish in future versions of python-ldap. See also Demo/initialize.py in python-ldap's source distribution. Ciao, Michael. -- http://mail.python.org/mailman/listinfo/python-list
Date type in win32com?
Hi. I'm migrating a VBScript into python. How should I convert Date type parameter in VBScript's COM interface with win32com? I couldn't find any answer yet... Thank you in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: logging exceptions
Alexandru Mosoi napisał(a):
why doesn't logging throw any exception when it should? how do I
configure logging to throw exceptions?
try:
... logging.fatal('asdf %d', '123')
... except:
... print 'this line is never printed'
...
[...]
You need to subclass your handler and redefine `handleError` method.
See: http://docs.python.org/lib/node409.html
HTH,
Rob
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Re: Split function for host:port in standard lib
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
AFAIK port names cannot contain any colons, so python2.5's
'host:port' .rsplit(':') should do the job. On 2.5 you probably
need to do something like
s = addr.rindex(':')
host, port = addr[:s], addr[s+1:]
Best,
Manuel
On Aug 26, 2008, at 1:31 PM, Michael Ströder wrote:
HI!
Is there a function in the standard lib which can be used to split
a string containg 'host:port' into a tuple (host,port) and also
does this reliably for IPv6 addresses?
Ciao, Michael.
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eYyGqdIl8ONJxznwJYZ78Cc=
=s8rW
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What's your first choice if you have to write a C module for python?
Hi all, I read this interesting post comparing Boost.Python with Pyd: http://pyd.dsource.org/vsboost.html What's your opinion about it? What's your first choice when you have write a C/C++ module for Python? -- http://mail.python.org/mailman/listinfo/python-list
Re: Private attribute
Steven D'Aprano wrote: snip def SomeClass(object): _gridsize = 0.8 The leading underscore tells callers that they change the attribute at their own risk. An even more Pythonic approach is to write your class that makes no assumptions about gridsize, and thus explicitly supports any reasonable grid size. The parent class, makes no assumption about grid-size, and I have put a great deal of functionality there. The methods of the derived class that depend on a gridsize of 8mm are mostly concerned with standard LaTeX glyphs (from a specific font) at standard LaTeX sizes. I am fitting a small subset of them into my grid by hand, in a way that I don't think could be easily automated even if I use the metric information. Not impossible, just too much hastle. The general rationale of the project is 'pen-and-ink' algorithms for arithmetic, on quadrille paper. It is to create figures that will be imported into LaTeX later. (By the way, it is perfectly easy to re-scale the figure after the digits, carry-figures, and other glyphs are placed. So long as you don't mind the font-size within the figure to be out of kilter with the font-size of the main run of LaTeX text.) I hope this explains why I have decided on a Read-only attribute, the first one ever, apart from a quick try-out when I started with Python. And that was when Guido was still in Amsterdam. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's your first choice if you have to write a C module for python?
[EMAIL PROTECTED]: I read this interesting post comparing Boost.Python with Pyd: http://pyd.dsource.org/vsboost.html What's your opinion about it? What's your first choice when you have write a C/C++ module for Python? That's not exactly a post. Pyd works well enough, it's easy to use and requires very little extra code for the interface, I've used it several times. But it's designed for D, not for C/C++, so in some situations it can be useless. For C/C+ + you can find any kind of lib to wrap with Swig/ SIP/ Boost Python/ Cython/ etc, but you can't find much for D yet. And the D community is very small, so there's just 1 person that updates Pyd, so updates are slow, support limited (but it exists, on the #D IRC channel) and so on. D surely isn't as complex as C++, and it's way nicer, but it's not simple either, so learning it may require some time. Another thing to think about is that C code sometimes may be even two times faster than D code, so if max speed is essential, then D may not be the best choice. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Sharing common memory space (In form of List) across the python processes.
Hi, Thanks for your reply Terry. I am still not done with this problem. Please tell me can a server send a list object using socket programming to the requesting client? If yes, how? I am getting the following error TypeError: send() argument 1 must be string or read-only buffer, not list For sending list object I tried the following code: - Server Code: - - someList = [ 1, 2, 7, 9, 0 ] pickledList = pickle.dumps ( id(someList) ) # Our thread class: class ClientThread ( threading.Thread ): # Override Thread's __init__ method to accept the parameters needed: def __init__ ( self, channel, details ): self.channel = channel self.details = details threading.Thread.__init__ ( self ) def run ( self ): print 'Received connection:', self.details [ 0 ] self.channel.send ( pickledList ) self.channel.close() print 'Closed connection:', self.details [ 0 ] # Set up the server: server = socket.socket ( socket.AF_INET, socket.SOCK_STREAM ) server.bind ( ( '', 2727 ) ) server.listen ( 5 ) # Have the server serve forever: while True: channel, details = server.accept() print channel, details ClientThread ( channel, details ).start() Client Code: - - class ConnectionThread ( threading.Thread ): def run ( self ): # Connect to the server: client = socket.socket ( socket.AF_INET, socket.SOCK_STREAM ) client.connect ( ( 'localhost', 2727 ) ) #print 'Connected!!',client # Retrieve and unpickle the list object: lst= pickle.loads ( client.recv ( 1024 ) ) # Close the connection client.close() # Let's spawn a few threads: for x in xrange ( 10 ): ConnectionThread().start() - In the above code I am able to get the id of the server List in the client, but can not access the content at the client. And if I send the pickled list to the client, it creates a new list at the client end, which is not desirable. Please suggest how to share a in-memory list object across two different programs? Thanks. Piyush. =-=-= Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you -- http://mail.python.org/mailman/listinfo/python-list
Re: why in returns values for array and keys for dictionary
On Aug 26, 4:04 pm, ++imanshu [EMAIL PROTECTED] wrote: On Aug 26, 11:52 am, Erik Max Francis [EMAIL PROTECTED] wrote: ++imanshu wrote: Wouldn't it be nicer to have 'in' return values (or keys) for both arrays and dictionaries. Arrays and Dictionaries looked so similar in Python until I learned this difference. It's because dealing with keys makes far more sense, since that's how the dictionary data structure works. If you're doing this an awful lot -- whether testing for inclusion or iterating -- then you're probably using the wrong data structure. Thanks for the detailed replies. Python seems to be taking the pragmatic approach here instead of the pure one. And yes it makes more sense. Anyway, there is two obvious choice when dealing with dictionary looping: return the keys and return the key and value. The python designer thought that it is trivial to get the value from key so returning both key and value, when the value might not be used at all, is redundant and might cause a slow down. In the case where it is actually needed for practicality (usually one-liner), then dict.iteritems() is provided, in other cases where you don't need the key (usually when you're applying a uniform function to dictionary or to convert it to a list), dict.itervalues() is provided, and for completeness dict.iterkeys() which is completely useless in a for-loop is provided (the only case where it _might_ be useful is in callbacks). Anyway, in short (in code): for key in dict: print key, dict[key] is exactly the same as: for key, value in dict.iteritems(): print key, value or for key in dict: value = dict[key] print key, value # the next line is not needed if you don't modify an immutable value dict[key] = value -- http://mail.python.org/mailman/listinfo/python-list
Re: Sharing common memory space (In form of List) across the python processes.
On Tue, 26 Aug 2008 18:18:53 +0530 Piyush Chechani [EMAIL PROTECTED] wrote: Please suggest how to share a in-memory list object across two different programs? Perhaps you want to investigate XML-RPC. Check the docs for some example scripts for both client and server. P.S. Please drop the legal crap from your postings. This is a public list and such things are just a waste of space. -- D'Arcy J.M. Cain [EMAIL PROTECTED] | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list
Re: Filling in Degrees in a Circle (Astronomy)
On Aug 23, 6:12 am, W. eWatson [EMAIL PROTECTED] wrote: The other night I surveyed a site for astronomical use by measuring the altitude (0-90 degrees above the horizon) and az (azimuth, 0 degrees north clockwise around the site to 360 degrees, almost north again) of obstacles, trees. My purpose was to feed this profile of obstacles (trees) to an astronomy program that would then account for not sighting objects below the trees. When I got around to entering them into the program by a file, I found it required the alt at 360 azimuth points in order from 0 to 360 (same as 0). Instead I have about 25 points, and expected the program to be able to do simple linear interpolation between those. Is there some simple operational device in Python that would allow me to create an array (vector) of 360 points from my data by interpolating between azimuth points when necessary? All my data I rounded to the nearest integer. Maybe there's an interpolation operator? As an example, supposed I had made 3 observations: (0,0) (180,45) and (360,0). I would want some thing like (note the slope of the line from 0 to 179 is 45/180 or 0.25): alt: 0, 0.25, 0.50, 0.75, ... 44.75, 45.0 az : 0, 1, 2, 3, 180 Of course, I don't need the az. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7 N, 121° 2' 32 W, 2700 feet Web Page: www.speckledwithstars.net/ Linear interpolation is simple, any mathematician would know. It's just like this: hA = height at point A hB = height at point B hN = height at point N (what we're finding) l = horizontal distance between A and B n = horizontal position measured from A hN = hA + ((n / l) * (hB - hA)) so: def interpolate(n, A, B): # A, B is two-tuple of (angle, height) of # the nearest known points surrounding n oA, hA = A oB, hB = B l = oB - oA return hA + ((n / l) * (hB - hA)) -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to set/get an object property
Steven D'Aprano a écrit : (snip) But it's quite rare to see double-underscore really private attributes in Python code. It is considered to go against the spirit of the language. Not necessarily against the spirit - it's mostly than __name_mangling is only really useful when you want to protect a really vital implementation attribute from being *accidentaly* overridden, and mostly annoying anywhere else. I'm told that in Java it is quite difficult to change a class from using public attributes to getters/setters, That's an understatement. Java has *no* support for computed attributes, so you just can *not* turn a public attribute into a computed one. and therefore many Java developers prefer to use getters/setters right from the beginning. Truth is that they have no other choice if they want to be able to decouple implementation from interface. -- http://mail.python.org/mailman/listinfo/python-list
Re: Programmatically exit the REPL
Without reading your post properly or having tried to do the same thing myself: I think you might want to have a look at ipython; it gives a better REPL and embedding ipython should give you plenty of hits as well. Matthew Fitzgibbons [EMAIL PROTECTED] writes: I've got a pretty complex interactive command line program. Instead of writing my own REPL, I'm using the Python interpreter (an infinitely better solution). This program has two threads, a background thread and the REPL thread. When you call quit() or sys.exit() in the REPL thread, everything is perfectly happy. However, the background thread does some long-running jobs, and I want it to have the ability to exit the program when the job is complete. When I call quit() or sys.exit() from the background thread, the REPL merrily continues on its way. This is a very frustrating problem, so I'm hoping someone can shed some light on it. Am I missing something simple? Or is this just impossible? I don't see anything about breaking out of interact() in the code module docs. Here's a minimal example: #!/usr/bin/env python -i # You get the same behavior using code.interact() import sys import time import threading def end_the_program(): # works if you call it from the REPL thread, # but not the background thread print called end_the_program() sys.exit() # quit() # using quit() rather than sys.exit() # results in identical behavior keep_going = True def runner(): while keep_going: time.sleep(0.1) end_the_program() threading.Thread(target=runner).start() # end example Here's the console session (edited for clarity): Desktop$ ./exit_repl.py keep_going = False called end_the_program() # notice we didn't exit here end_the_program() called end_the_program() # but we did exit here Desktop$ -Matt -- -- http://mail.python.org/mailman/listinfo/python-list
Empece hacer un blog de python http://binsd.wordpress.com/
La verdad que me da un poco de vergüenza pero bueno no se como colaborar con la comunidad python entonces empecé hacer conjunto de entradas en mi blog para todos aquellos que recién se inician en python.Aun no llegue a explicar objetos pero estaría bueno que me digan si voy por buen camino :-). Desde ya muchas gracias y perdón por las molestias. la direccion del blog es http://binsd.wordpress.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Need help with extension modules built in debug mode
On Tue, 26 Aug 2008 08:20:44 +0200, Fredrik Lundh [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: I've come to the conclusion that posting about Embedded Python on the Python forums is a complete waste of time. I hope I can get some useful insights here. (just curious, but what are the Python forums? isn't the newsgroup/mailing list *the* Python forum?) http://python-forum.org/pythonforum/index.php -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
On Tue, Aug 26, 2008 at 9:52 AM, cnb [EMAIL PROTECTED] wrote:
On Aug 26, 9:43 am, Martin Marcher [EMAIL PROTECTED] wrote:
On 2008-08-26 00:32:20, cnb wrote:
Are dictionaries the same as hashtables?
Yes, but there is nothing in there that does sane collision handling
like making a list instead of simply overwriting.
PS: your sig was *a bit* longer than you question. please don't do
that...
signature.asc
1KViewDownload
my what?
Hehe,
it was *my* sig... i was using some old box with a mut config that
still had the fortune script in it... sorry.
Anyway what I meant by collision handling was:
$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:31:22)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type help, copyright, credits or license for more information.
l = {}
l
{}
l[a] = 12
l[b] = 13
l
{'a': 12, 'b': 13}
l[a] = This is a collision
l
{'a': 'This is a collision', 'b': 13}
As you see position a is simply overwritten. Probably sane doesn't
really apply because how could the python creators possibly know
whether I just want to overwrite the value or indeed want some form of
collision handling (talk about lists vs. trees with there
subforms...)...
If one would want that he/she/it could still subclass dict and do more magic.
/martin
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python multitask
Hi ! I want use many comands in same python script . I want to use openoffice and pyuno . I try this cmdoo=openoffice.org -accept='socket,host=localhost,port=2002;urp;' subprocess.call(cmdoo, shell=True) but i need to execute another comand and need to stop subprocess Thank you ! -- http://mail.python.org/mailman/listinfo/python-list
GUI programming with python
Hello Everyone It's my very first email to this group. i am a beginner programmer of python. it it possible to build Desktop application using python. Which IDE should i use for this purpose? I will be glad if anyone can give link of python ebook. Thanks in Advance Zamil -- http://mail.python.org/mailman/listinfo/python-list
atomic increment
how can i do an atomic read+increment? something like with lock: old = atomic_int atomic_int += 1 but in one operation -- http://mail.python.org/mailman/listinfo/python-list
Re: [ctypes-users] ctypes - loading 'librsvg-2-2.dll'
On 26/08/2008, Tim Grove [EMAIL PROTECTED] wrote:
Any ideas why a particular dll won't load on Windows XP Pro using
ctypes?
I'm going to take a stab in the dark here and suggest it's because you
have multiple (different) copies of iconv.dll on your PATH.
l=CDLL(r'D:\SILSign\librsvg-2-2.dll')
Traceback (most recent call last):
File input, line 1, in module
File C:\PYTHON25\LIB\ctypes\__init__.py, line 349, in __init__
self._handle = _dlopen(self._name, mode)
WindowsError: [Error 127] The specified procedure could not be found
I get this on my current setup, where I've been messing around trying
to recompile lynx against iconv. I also get a popup saying The
procedure entry point libiconv_set_relocation_prefix could not be
located in the dynamic link library iconv.dll.
Doing this worked for me:
C:\set PATH=C:\Program Files\Common Files\GTK\2.0\bin
C:\C:\Python24\python.exe -c import ctypes; print
ctypes.CDLL('librsvg-2-2')
CDLL 'librsvg-2-2', handle 68e4 at bd9b50
Change the paths to your equivalents and try it, see if you have the
same or a similar dependency problem.
Martin
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libxml2dom - parsing maligned html
Hi... I'm using quick test with libxml2dom === import libxml2dom aa=libxml2dom.parseString(foo) ff=libxml2dom.toString(aa) print ff === -- when i start, foo is: html body /body /html html body . . . /body /html --- when i print ff it's: html body /body /html --- so it's as if the parseString only reads the initial html tree. i've reviewed as much as i can find regarding libxml2dom to try to figure out how i can get it to read/parse/handle both html trees/nodes. i know, the html is maligned/screwed-up, but i can't seem to find any app (tidy/beautifulsoup) that can know which one of the html trees to throw out/remove!! technically, both html trees are valid, it's just that they both shouldn't be in the file!!! thoughts/comments appreciated thanks -- http://mail.python.org/mailman/listinfo/python-list
python portable installation?
Hi, I have searched the online manuals, faqs and forums, but i haven't found a satisfactory explanation ... most probably my fault ;) I have found 2 projects, one commercial and another free, that deal with the installation and running of python code on portable/removable devices, my questions are: (1) Is this scenario not yet contemplated in the official releases, and (2) Why is such a big issue? Will appreciate your comments, Thanks in advance Luismi -- http://mail.python.org/mailman/listinfo/python-list
Re: libxml2dom - parsing maligned html
On 26 Aug, 17:28, bruce [EMAIL PROTECTED] wrote: so it's as if the parseString only reads the initial html tree. i've reviewed as much as i can find regarding libxml2dom to try to figure out how i can get it to read/parse/handle both html trees/nodes. Maybe there's some possibility to have libxml2 read directly from a file descriptor and to stop after parsing the first document, leaving the descriptor open; currently, this isn't supported by libxml2dom, however. Another possibility is to feed text to libxml2 until it can return a well-formed document, which I do as part of the libxml2dom.xmpp module, but I don't really support this feature in the public API. Again, improvements to libxml2dom may happen if I find the time to do them. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: atomic increment
Alexandru Mosoi wrote: how can i do an atomic read+increment? something like with lock: old = atomic_int atomic_int += 1 but in one operation As above - the lock (under the assumption that it is actually a threading.Lock) will ensure that. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: libxml2dom - parsing maligned html
bruce wrote: I'm using quick test with libxml2dom === import libxml2dom aa=libxml2dom.parseString(foo) ff=libxml2dom.toString(aa) print ff === -- when i start, foo is: html body /body /html html body . . . /body /html --- when i print ff it's: html body /body /html --- so it's as if the parseString only reads the initial html tree. i've reviewed as much as i can find regarding libxml2dom to try to figure out how i can get it to read/parse/handle both html trees/nodes. i know, the html is maligned/screwed-up, but i can't seem to find any app (tidy/beautifulsoup) that can know which one of the html trees to throw out/remove!! technically, both html trees are valid, it's just that they both shouldn't be in the file!!! What about splitting the string on html and them parsing each part on its own? Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: python portable installation?
luismi wrote: I have searched the online manuals, faqs and forums, but i haven't found a satisfactory explanation ... most probably my fault ;) I have found 2 projects, one commercial and another free, that deal with the installation and running of python code on portable/removable devices, my questions are: (1) Is this scenario not yet contemplated in the official releases, and (2) Why is such a big issue? there's no problem putting a python program, including a full runtime, anywhere on any disk. the above tools simply streamline the process. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
In article [EMAIL PROTECTED], Diez B. Roggisch [EMAIL PROTECTED] wrote: Martin Marcher wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? . . . Python does not have a one key maps to a list of values-semantics - which I consider the sane choice... However, you can have that using the defaultdict for example: listdict = defaultdict(list) listdict[key].append(value) Diez ? I'm lost. As I understand your terms, Python's dictionaries map keys to objects, but you would prefer that Python's dictionaries map keys only to lists of values. That *sounds* like a complexification, at best. Are you trying to make a point about implementation aligning with semantics? -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
Martin Marcher wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. are you sure you know what collision handling means in this context? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: File copying from a menu
Ok, below is a portion of the code that first (near as I can tell because I had nothign to do with desgining the program) sets up the menu (setupMenuBar) and then adds the commands to be used with the items: def setupMenuBar(self): menubar = self.menuBar() file_ = menubar.addMenu(File) file_.addAction(self.importEx) file_.addAction(self.exitAct) def createActions(self): fileMenu = QtGui.QMenu(self.tr(File), self) self.importEx = QtGui.QAction(self.tr(Import Excel Document), self) self.importEx.setShortcut(self.tr(Ctrl+E)) self.importEx.setStatusTip(self.tr(Import Excel Document)) self.connect(self.importEx, QtCore.SIGNAL(triggered()), self.importExcel) self.exitAct = QtGui.QAction(self.tr(Exit), self) self.exitAct.setShortcut(self.tr(Ctrl+Q)) self.exitAct.setStatusTip(self.tr(Exit the application)) self.connect(self.exitAct, QtCore.SIGNAL(triggered()), self, QtCore.SLOT(close())) Fredrik Lundh [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Brandon wrote: I'm attempting to have a file copied from a menu selection. The menu already exists, but it won't even create the menu item. If anyone has any ideas, please let me know. try cutting down your code to a minimal example that illustrates the problem, and post that code (that'll also allow us to figure out what library you're using to create the menu...). /F -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI programming with python
zamil was kind enough to say: [cut] If your needs are very basic, you can stick with the tk module that comes with python. It's not really feature-packed, but it's maintained and pretty cross-platform. Otherwise, you can pick any supported widget set you like and use the proper python bindings. You didn't tell us which OS you'd work with, hence we can't tell you what's the best choice (if there's any). BTW you should be able to enjoy GTK+, QT or Swing (if using Jython on Java) or anything found in MS.NET (if using IronPython) - or you can go for wxPython as well. GUI Designers are widget-set related - I can suggest gazpacho for GTK+. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: What's your first choice if you have to write a C module for python?
一首诗 wrote: I read this interesting post comparing Boost.Python with Pyd: http://pyd.dsource.org/vsboost.html What's your opinion about it? What's your first choice when you have write a C/C++ module for Python? There is no such thing as a C/C++ language. Seriously, both are really different and require different approaches. That said, when writing a C++ module I use Boost.Python, for one because Boost is already part of many C++ projects but also because it is simply very easy and convenient to use. There is another alternative, ctypes, which also works but it IMHO brings many of the disadvantages of C to Python. In particular those are manual resource management and lack of exceptions. Looking at Boost.Python though, you can simply throw a C++ exception and it gets mapped to a Python exception, and resource management is also a non issue since you can make ownership transfers explicit. Now, concerning pyd, I think you are comparing apples to oranges. If you had asked which language I would chose to write a Python plugin, that would have been a totally different thing. To that, the answer is in order of preference: 1. Python ;) 2. C++ with Boost.Python 3. C with ctypes cheers Uli -- Sator Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
Diez B. Roggisch wrote: I don't know the exact names of the involved structures - I named them liberally from my understanding of how associative arrays based on hashing are implemented. But the below code shows that hash-collisions can occur without corrupting data http://en.wikipedia.org/wiki/Open_addressing Open addressing, or closed hashing, is a method of collision resolution in hash tables. With this method a hash collision is resolved by probing, or searching through alternate locations in the array (the probe sequence) until either the target record is found, or an unused array slot is found, which indicates that there is no such key in the table. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Are dictionaries the same as hashtables?
Cameron Laird wrote: In article [EMAIL PROTECTED], Diez B. Roggisch [EMAIL PROTECTED] wrote: Martin Marcher wrote: On 2008-08-26 00:32:20, cnb wrote: Are dictionaries the same as hashtables? . . . Python does not have a one key maps to a list of values-semantics - which I consider the sane choice... However, you can have that using the defaultdict for example: listdict = defaultdict(list) listdict[key].append(value) Diez ? I'm lost. As I understand your terms, Python's dictionaries map keys to objects, but you would prefer that Python's dictionaries map keys only to lists of values. That *sounds* like a complexification, at best. Are you trying to make a point about implementation aligning with semantics? The OP seems to want that (or at least sees it as one of two viable design choices), see his other answer in this thread. I certainly *don't* agree with that, I merely pointed out that python comes with means to easily create such a data-structure in the case it is needed. Diez -- http://mail.python.org/mailman/listinfo/python-list
Best idiom for looping over input?
What's the best Python idiom for this C construct?
while ((x = next()) != END) {
}
Now I'm doing
x = next()
while x != END:
x = next()
There's not an iterator for this function, or I would
just use
for x in ...
Many TIA!
Mark
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Mark Harrison
Pixar Animation Studios
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Newbie needs help
Greetings all,
I'm wanting to maintain what values in one file and call them in
another. The purpose being to keep a single location where url's,
login's and passwords can be maintained, then called as needed from
another file.
In file #1 I have...
import time
import os
import sys
url = 'http://zoo/'
adminlogin = 'Zebra'
adminpassword = 'Zebra12$'
-
In file #2 I have the following...
from cPAMIE import PAMIE
#Imports - used to setup / control finding files
import time
import os
import sys
import loginout#name of the file retaining all url/login info
from log import log
#Create New Pamie Object
ie=PAMIE()
ie=Visible =1
t=time
adminlogin (ie,url)
if ie.findText ('Site Status: Active'):
log ('PASSED -- ADMIN Module - ADMIN Login Admin Tab Navigation
Successful')
else:
log ('WARNING -- ADMIN Module Login Admin Tab Navigation
FAILED')
time.sleep(2)
What am I doing incorrectly to not have file two log in when
executed. All files are in the same directory. Keep it simple...
I'm new at this.
THNX
--
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Re: Return a string result with out breaking loop
Hi I have done this without error
:D
Yield returns the result I am looking for... however it does not
continue looping. It does the same thing as return would
any suggestions
my code is as follows
serveraddr = ('', )
srvr = ThreadingServer(serveraddr, SimpleXMLRPCRequestHandler,
allow_none=True)
srvr.register_instance(theApp())
srvr.register_introspection_functions()
def watchos(path_to_watch=C:\\):
#get path or maintain current path of app
FILE_LIST_DIRECTORY = 0x0001
try: path_to_watch or .
except: path_to_watch = .
path_to_watch = os.path.abspath(path_to_watch)
out1 = Watching %s at %s % (path_to_watch, time.asctime()) + \n\n
# FindFirstChangeNotification sets up a handle for watching
# file changes.
while 1:
hDir = win32file.CreateFile (
path_to_watch,
FILE_LIST_DIRECTORY,
win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE,
None,
win32con.OPEN_EXISTING,
win32con.FILE_FLAG_BACKUP_SEMANTICS,
None
)
change_handle = win32file.ReadDirectoryChangesW (
hDir,
1024,
True,#Heap Size include_subdirectories,
win32con.FILE_NOTIFY_CHANGE_FILE_NAME |
win32con.FILE_NOTIFY_CHANGE_DIR_NAME |
win32con.FILE_NOTIFY_CHANGE_ATTRIBUTES |
win32con.FILE_NOTIFY_CHANGE_SIZE |
win32con.FILE_NOTIFY_CHANGE_LAST_WRITE |
win32con.FILE_NOTIFY_CHANGE_SECURITY,
None,
None
)
# Loop forever, listing any file changes. The WaitFor... will
# time out every half a second allowing for keyboard interrupts
# to terminate the loop.
ACTIONS = {
1 : Created,
2 : Deleted,
3 : Updated,
4 : Renamed from something,
5 : Renamed to something
}
results = change_handle
for action, files in results:
full_filename = os.path.join(path_to_watch, files)
theact = ACTIONS.get(action, Unknown)
out2 = str(full_filename) ++ str(theact)
yield str(out2)
servg = watchos()
srvr.register_function(servg.next, 'watchos')
srvr.register_multicall_functions()
srvr.serve_forever()
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Re: Programmatically exit the REPL
Alexander Schmolck wrote: Without reading your post properly or having tried to do the same thing myself: I think you might want to have a look at ipython; it gives a better REPL and embedding ipython should give you plenty of hits as well. Thanks for the tip; I hadn't heard of ipython before. I will certainly check it out. However, if anyone knows how to break out of the interactive interpreter from another thread, I'd still very much like to hear about it. :) -Matt -- http://mail.python.org/mailman/listinfo/python-list
Re: Best idiom for looping over input?
On Tue, 26 Aug 2008 16:42:30 GMT, [EMAIL PROTECTED] wrote:
What's the best Python idiom for this C construct?
while ((x = next()) != END) {
}
Now I'm doing
x = next()
while x != END:
x = next()
There's not an iterator for this function, or I would
just use
for x in ...
Use the magical second parameter to the `iter´ builtin:
for x in iter(next, END):
...
Jean-Paul
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Re: Newbie needs help
Is the loginout file named loginout.py ? It needs to be for the
import to work. If the import works, you have to refer to those
variables within the right namespace, ie : loginout.url,
loginout.adminlogin, etc.
On Tue, Aug 26, 2008 at 12:46 PM, frankrentef [EMAIL PROTECTED] wrote:
Greetings all,
I'm wanting to maintain what values in one file and call them in
another. The purpose being to keep a single location where url's,
login's and passwords can be maintained, then called as needed from
another file.
In file #1 I have...
import time
import os
import sys
url = 'http://zoo/'
adminlogin = 'Zebra'
adminpassword = 'Zebra12$'
-
In file #2 I have the following...
from cPAMIE import PAMIE
#Imports - used to setup / control finding files
import time
import os
import sys
import loginout#name of the file retaining all url/login info
from log import log
#Create New Pamie Object
ie=PAMIE()
ie=Visible =1
t=time
adminlogin (ie,url)
if ie.findText ('Site Status: Active'):
log ('PASSED -- ADMIN Module - ADMIN Login Admin Tab Navigation
Successful')
else:
log ('WARNING -- ADMIN Module Login Admin Tab Navigation
FAILED')
time.sleep(2)
What am I doing incorrectly to not have file two log in when
executed. All files are in the same directory. Keep it simple...
I'm new at this.
THNX
--
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--
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Re: Are dictionaries the same as hashtables?
On Tue, Aug 26, 2008 at 11:12 AM, Fredrik Lundh [EMAIL PROTECTED] wrote: Martin Marcher wrote: Are dictionaries the same as hashtables? Yes, but there is nothing in there that does sane collision handling like making a list instead of simply overwriting. are you sure you know what collision handling means in this context? I think the confusion comes from thinking that dictionaries are (really) hash tables and thus that things like collision handling are exposed to the user of the data structure. In this sense, no, dictionaries are *not* hash tables. They are mappings of keys to values, and they use hash tables as part of their implementation. -- http://mail.python.org/mailman/listinfo/python-list
Re: extract text from ods TableCell using odfpy
frankentux wrote: Ok. Sorted it out, but only after taking a round trip over xml.minidom. Here's the working code: #!/usr/bin/python from odf.opendocument import Spreadsheet from odf.opendocument import load from odf.table import TableRow,TableCell from odf.text import P doc = load(/tmp/match_data.ods) d = doc.spreadsheet rows = d.getElementsByType(TableRow) for row in rows[:2]: cells = row.getElementsByType(TableCell) for cell in cells: tps = cell.getElementsByType(P) if len(tps) 0: for x in tps: print x.firstChild -- http://mail.python.org/mailman/listinfo/python-list = cd /opt find . -name *odf* -print (empty) cd /usr/local/lib/python2.5 find . -name *odf* -print (empty) OK - where is it? :) Steve [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Best idiom for looping over input?
[EMAIL PROTECTED] wrote:
What's the best Python idiom for this C construct?
while ((x = next()) != END) {
}
iter is your friend:
for x in iter(next, END):
...
details:
help(iter)
Help on built-in function iter in module __builtin__:
iter(...)
iter(collection) - iterator
iter(callable, sentinel) - iterator
Get an iterator from an object. In the first form, the
argument must supply its own iterator, or be a sequence.
In the second form, the callable is called until it
returns the sentinel.
/F
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sum up numbers in a list
hi all,
i have a list, for example;
L=[]
L.append('10')
L.append('15')
L.append('20')
len(L)
3
print L
['10', '15', '20']
is there a way to sum up all the numbers in a list? the number of objects
in the list is vary, around 50 to 60. all objects are 1 to 3 digit positive
numbers.
all i can think of is check the length of the list (in the above example,
3), then L[0]+L[1]+L[2] ..
is there a better way to do the job? thanks.
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Re: Return a string result with out breaking loop
Andrew wrote: Yield returns the result I am looking for... however it does not continue looping. It does the same thing as return would the XML-RPC protocol doesn't really support your use case; for each call, the client issues a complete request package, and the server produces a complete response in return. /F -- http://mail.python.org/mailman/listinfo/python-list
Reading from text file
I want to read from text file, 25 lines each time i press enter key, just like the python documentation. i`m using Python 2.5, Windows XP Thank you -- http://mail.python.org/mailman/listinfo/python-list
