Re: Just finished reading of What’s New In Python 3.0
Fitzgerald had been an alcoholic since his college days, and became notorious during the 1920s for his extraordinarily heavy drinking, leaving him in poor health by the late 1930s. According to Zelda's biographer, Nancy Milford, Scott claimed that he had contracted tuberculosis, but Milford dismisses it as a pretext to cover his drinking problems. However, Fitzgerald scholar Matthew J. Bruccoli contends that Fitzgerald did in fact have recurring tuberculosis, and Nancy Milford reports that Fitzgerald biographer Arthur Mizener said that Scott suffered a mild attack of tuberculosis in 1919, and in 1929 he had what proved to be a tubercular hemorrhage. It has been said that the hemorrhage was caused by bleeding from esophageal varices. -- http://mail.python.org/mailman/listinfo/python-list
Re: Use-cases for alternative iterator
Steven D'Aprano wrote: The iter() built-in takes two different forms, the familiar iter(iterable) we all know and love, and an alternative form: iter(callable, sentinel) I've never seen this second form in actual code. Does anyone use it, and if so, what use-cases do you have? I found 36 examples (7% of all iter() calls) on my Kubuntu: /usr/lib/pymodules/python2.6/multiprocessing/pool.py iter(taskqueue.get, None) /usr/lib/pymodules/python2.6/multiprocessing/tests.py iter(self.child_conn.recv, None) iter(q.get, None) iter(conn.recv_bytes, SENTINEL) iter(conn.recv, None) iter(conn.recv, 'STOP') /usr/lib/pymodules/python2.6/multiprocessing/examples/mp_workers.py iter(input.get, 'STOP') /usr/lib/pymodules/python2.6/pychecker2/util.py iter(Parents(obj), None) /usr/lib/pymodules/python2.6/processing/pool.py iter(inqueue.get, None) iter(taskqueue.get, None) iter(get, None) /usr/lib/pymodules/python2.6/processing/tests/__init__.py iter(self.child_conn.recv, None) iter(conn.recvBytes, '') iter(conn.recv, None) iter(conn.recv, 'STOP') /usr/lib/pymodules/python2.6/IPython/Extensions/ipipe.py iter(self, obj) iter(self, obj) iter(self, obj) /usr/lib/pymodules/python2.6/nose/plugins/multiprocess.py iter(get, 'STOP') /usr/lib/pymodules/python2.6/django/db/models/sql/query.py iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)), self.connection.features.empty_fetchmany_value) iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)), sentinel) /usr/lib/pymodules/python2.6/httplib2/__init__.py iter(self, domain) /usr/lib/pymodules/python2.6/MySQLdb/cursors.py iter(self.fetchone, None) /usr/lib/pymodules/python2.6/MoinMoin/server/server_wsgi.py iter(lambda: fileobj.read(bufsize), '') /usr/lib/python2.6/mailbox.py iter(self.readline, ) iter(self.next, None) iter(self.next, None) /usr/lib/python2.6/multiprocessing/pool.py iter(taskqueue.get, None) /usr/lib/python2.6/dist-packages/mutagen/id3.py iter(iter(parts).next, None) /usr/lib/python2.6/dist-packages/twisted/python/zipstream.py iter(lambda : self.read(1), ) /usr/lib/python2.6/dist-packages/twisted/web2/test/test_stream.py iter(s.read, None) /usr/lib/python2.6/dist-packages/twisted/test/test_compat.py iter(IterableCounter(20).next, 10) /usr/lib/python2.6/dist-packages/setuptools/command/sdist.py iter(f.readline, '') /usr/lib/python2.6/dist-packages/lxml/cssselect.py iter(self.next, None) /usr/lib/python2.6/dist-packages/bzrlib/smart/protocol.py iter(_body_decoder.read_next_chunk, None) /usr/lib/python2.6/dist-packages/bzrlib/tests/test_smart_transport.py iter(decoder.read_next_chunk, None) 467 36 7.15705765408 -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 11:17:08 +0200, Anssi Saari wrote: Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) I used Fortran and C. Pascal was pretty popular then as was BASIC; likely included. I know there was an Ada compiler as well; required by DOD, as it was the 'language of choice'. Some days the DOD is just foolish, dictating what must work better on hardware. Sort of like the need to push Java or C-Sharp on everything. Ada always reminded me of Cobol. Oh yes, Cobol also worked on VMS (yikes! the columns just right issues!). I remember a Properties officer, upset that I wanted pricing data included in the printout. Adding that was beyond the 132 character output of the page. She seemed quite upset when I asked just for the 4 of 18 columns I was interested in, be printed. By 1998, Cobol programs were rare (although the language was pretty easy to learn). So: Fortran, C, Pascal, Cobol, Ada and ... APL. Let's see how many remember that very fun language (and I mean fun). GrayShark -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 00:26:37 -0800, Dennis Lee Bieber wrote: On Thu, 10 Mar 2011 19:55:02 + (UTC), Grant Edwards invalid@invalid.invalid declaimed the following in gmane.comp.python.general: vt200 terminals. The vt200 wasn't a TV. It was a character-based, mostly-ANSI-escape-sequence, computer terminal connected via async I think the order went the other way -- I think most of the ANSI sequences were inherited from the VT52/VT100 terminals. Are you implying ascii came after the VT52/VT110 terminals? VT52 is a ascii code based piece of shit, including the backspace/return character set (which Windows still honors like it's a deity). Working from the old days, the ascii set used 0-127 (zero - seventh bit) to represent special keys and sounds, letters, numbers and common punctuations. The eight bit was reserved for error correct. Remember this was a serial 'printer' console language. It need updating as much as the QWERTY keyboard does. Sometime after 1975, graphical glyphs were added, using the eighth bit. Some VT models supported the extended ascii, as did IBM-DOS. Strange the history one remembers. -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Thu, 2011-03-10, Martin Gregorie wrote: On Thu, 10 Mar 2011 20:31:11 +, Grant Edwards wrote: You tricked me by saying only DEC VAX/VMS programmers would know what it was. In fact, many, many Unix programmers knew about curses (and still do) and very few VMS programmers ever did. C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. From the context the only DEC VAX/VMS programmers remark applied to the VT-100. However, the OP is wrong about that - VT-100s were well-known and popular devices in the 8-bit microprocessor world too, together with assorted clones. In addition, many other terminals had a VT-100 emulation mode. IIRC all the Wyse terminals had that. But he wrote VT-200, not VT-100. I assumed he meant those (vt200) had some exotic graphics mode. The VT-xxx series was pretty heterogenous, although most of us think of them as more or less fancy VT-100s. /Jorgen -- // Jorgen Grahn grahn@ Oo o. . . \X/ snipabacken.se O o . -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 04:39:02 -0600, GrayShark wrote: I think the order went the other way -- I think most of the ANSI sequences were inherited from the VT52/VT100 terminals. Are you implying ascii came after the VT52/VT110 terminals? VT52 is a ascii code based piece of shit, including the backspace/return character set (which Windows still honors like it's a deity). He said ANSI, not ASCII. Any, yes I think VT100 preceeded ANSI escape codes too. ANSI codes are very similar to VT100 escape codes. I don't remember seeing ANSI codes before the MS-DOS ANSI driver was introduced but I'd used VT100s long before that on assorted minis and 8-bit micros. Working from the old days, the ascii set used 0-127 (zero - seventh bit) to represent special keys and sounds, letters, numbers and common punctuations. The eight bit was reserved for error correct. Remember this was a serial 'printer' console language. It need updating as much as the QWERTY keyboard does. Sometime after 1975, graphical glyphs were added, using the eighth bit. Some VT models supported the extended ascii, as did IBM-DOS. Strange the history one remembers. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | -- http://mail.python.org/mailman/listinfo/python-list
PyCon
Hello, I noticed the old presentations at PyCon aren't avaliable anymore. http://us.pycon.org/2010/ http://us.pycon.org/2009/ Does anyone know where else I can get these presentations? -- --- Get your facts first, then you can distort them as you please.-- -- http://mail.python.org/mailman/listinfo/python-list
Re: PyCon
http://blip.tv/search?q=pycon http://blip.tv/search?q=pyconHTH Nick On Fri, Mar 11, 2011 at 4:45 AM, Rita rmorgan...@gmail.com wrote: Hello, I noticed the old presentations at PyCon aren't avaliable anymore. http://us.pycon.org/2010/ http://us.pycon.org/2009/ Does anyone know where else I can get these presentations? -- --- Get your facts first, then you can distort them as you please.-- -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Python SIG for Healthcare IT
For those seeking to work with Python-based tools in the healthcare IT industry, this SIG (special interest group) can provide a forum to discuss challenges and hopefully foster knowledge sharing and tools development. Relevant topics include tools for working with healthcare standard data formats, industry news items, professional development, and success stories about Python and open source in the healthcare industry. Along the way, this SIG page can be updated with links to relevant projects and resources. If this interests you, please join this discussion on the mailing list: http://mail.python.org/mailman/listinfo/healthcare This is a new list, so it has no archives as of yet. If you're attending PyCon today, please join us in a face to face meeting at 1pm in the Hanover A open space room. As with all open space meetings, all are welcome, including those with no healthcare IT background interested in joining the industry. -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On 2011-03-10 14:55:02 -0500, Grant Edwards said: Eh? Those are viddotex/teletext systems aren't they? I thought the OP was talking about a character-based windowing and form-handling library used by applications that ran under VAX/VMS on vt200 terminals. The vt200 wasn't a TV. It was a character-based, mostly-ANSI-escape-sequence, computer terminal connected via async serial (RS-232 typically) to a mini/mainframe computer (a DEC VAX running VMS in this context). NAPLPS isn't, but you're correct about the others. NAPLPS had character encoded graphics as well as vector drawing codes. It was based on an earlier ANSI x.500 protocol that was used in Teleltex, etc., but I've forgotten the exact name/designation. In the US, most of the Teletex work was done on DEC hardware, AFAIK... Best, Charles -- http://mail.python.org/mailman/listinfo/python-list
Re: Passing Functions
On Mar 11, 2:00 am, MRAB pyt...@mrabarnett.plus.com wrote:
On 11/03/2011 01:13, yoro wrote:
Hi,
I am having an issue with passing values from one function to another
- I am trying to fill a list in one function using the values
contained in other functions as seen below:
infinity = 100
invalid_node = -1
startNode = 0
#Values to assign to each node
class Node:
distFromSource = infinity
previous = invalid_node
visited = False
#read in all network nodes
def network():
f = open ('network.txt', 'r')
theNetwork = [[int(node) for node in line.split(',')] for line in
f.readlines()]
print theNetwork
return theNetwork
#for each node assign default values
def populateNodeTable():
nodeTable = []
index = 0
f = open('network.txt', 'r')
for line in f:
node = map(int, line.split(','))
nodeTable.append(Node())
print The previous node is ,nodeTable[index].previous
print The distance from source is
,nodeTable[index].distFromSource
index +=1
nodeTable[startNode].distFromSource = 0
return nodeTable
#find the nearest neighbour to a particular node
def nearestNeighbour(currentNode, theNetwork):
nearestNeighbour = []
nodeIndex = 0
for node in nodeTable:
if node != 0 and currentNode.visited == false:
nearestNeighbour.append(nodeIndex)
nodeIndex +=1
return nearestNeighbour
if __name__ == __main__:
nodeTable = populateNodeTable()
theNetwork = network()
nearestNeighbour(currentNode, theNetwork, )
So, I am trying to look at the values provided by the network
function, set all nodes to 'visited = false' in populateNodeTable
function and then determine the nodes' nearest neighbour by looking at
the values provided in the previous function, though I get this error
message:
if node != 0 and currentNode.visited == false:
AttributeError: 'int' object has no attribute 'visited'
I'm not sure what to try next
In nearestNeighbour, 'currentNode' is an int because that's what you're
passing in ... except that you aren't.
You're passing in the value of the global 'currentNode', which doesn't
exist. Perhaps you meant 'startNode'?
When I run the above program I get:
Traceback (most recent call last):
File C:\Documents and Settings\Administrator\Desktop\network.py,
line 49, in module
nearestNeighbour(currentNode, theNetwork, )
NameError: name 'currentNode' is not defined
I've found the error, I had to type in:
for node in nodeTable:
if node != 0 and Node.visited == False:
--
http://mail.python.org/mailman/listinfo/python-list
Re: Just finished reading of What’s New In Python 3.0
On Thu, 2011-03-10 at 17:58 -0800, n00m wrote: http://docs.python.org/py3k/whatsnew/3.0.html What's the fuss abt it? Imo all is ***OK*** with 3k (in the parts I understand). I even liked print as a function **more** than print as a stmt Now I think that Py3k is better than all prev pythons and cobras. n00m: GET A BLOG. -- http://mail.python.org/mailman/listinfo/python-list
Grabbing user's agent and OS type
Hello, I use os.environ[HTTP_USER_AGENT] and is very convenient to retrieve the user's agent type but how could we also retrieve the user's OS type? OS type and agent type and version do appear in the same string. I somehow have to grab the 'OS' type(Windows) and the user's agent/ version(Chrome 11) The string is: [code] Mozilla/5.0 (Windows; Windows NT 6.1) AppleWebKit/534.23 (KHTML, like Gecko) Chrome/11.0.686.0 Safari/534.23 [/code] How am i supposed to filter the string since the subsparts of the string isn't always the same and maybe also in different positions within the each time different returned string? For example from he above string i only need to know that the OS type is 'Windows' and that the agent type is 'Chrome 11' But those strings vary in each case. If it cant be done by filtering the value of os.environ[HTTP_USER_AGENT] is there any other easier way that i can retrive those values? -- http://mail.python.org/mailman/listinfo/python-list
Creating a very simple revision system for photos in python
I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. We are talking about large numbers of photos and some of them are large in size as well, but the functionality does not have to be a full fledged revision system, just handle checking out, checking in, handling conflicts, rollbacks etc, preferrably without storing complete copies of the files in question for every operation. Thanks for any input. :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing user's agent and OS type
On Fri, 11 Mar 2011 06:37:42 -0800, Νικόλαος Κούρας wrote: Hello, I use os.environ[HTTP_USER_AGENT] and is very convenient to retrieve the user's agent type but how could we also retrieve the user's OS type? sys.platform 'linux2' os.name 'posix' OS type and agent type and version do appear in the same string. I somehow have to grab the 'OS' type(Windows) and the user's agent/ version(Chrome 11) The string is: [code] Mozilla/5.0 (Windows; Windows NT 6.1) AppleWebKit/534.23 (KHTML, like Gecko) Chrome/11.0.686.0 Safari/534.23 [/code] How am i supposed to filter the string since the subsparts of the string isn't always the same and maybe also in different positions within the each time different returned string? useragent = Mozilla/5.0 blah blah blah agent = useragent.lower() if mozilla in agent: print user-agent claims to be Mozilla compatible if chrome in agent: print user-agent claims to be Chrome compatible if safari in agent: print user-agent claims to be Safari compatible if python in agent: print user-agent claims to be a Python program, module or script if lynx in agent: print user-agent claims to be the Lynx browser if links in agent: print user-agent claims to be the Links browser if windows in agent: print user-agent claims that the operating system is Windows # and so on print remember that user-agents can, and frequently do, lie I think you give the user-agent string too much credit. Despite what some people think, including some browser developers, it's a free-form string and can contain anything the browser wants. There's no guarantee that fields will appear in a particular order, or even appear at all. If you're doing feature detection by parsing the UA string, you're in a state of sin. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On 03/11/2011 04:24 AM, GrayShark wrote: Oh yes, Cobol also worked on VMS (yikes! the columns just right issues!). IDENTIFICATION DIVISION. PROGRAM-ID. PAIN-PAIN-PAIN. PROCEDURE DIVISION. DISPLAY 'Thanks for dredging up painful memories'. DISPLAY 'I've spent 15 years working to suppress'. STOP RUN. :) -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
Aw! to stray down memory lane. Well enough straying. Back to work. GrayShark -- http://mail.python.org/mailman/listinfo/python-list
Re: PyCon
On 3/11/2011 7:45 AM, Rita wrote: http://us.pycon.org/2010/ http://us.pycon.org/2009/ Try the wayback machine: http://replay.waybackmachine.org/20100701160843/http://us.pycon.org/2010/about/ -- http://mail.python.org/mailman/listinfo/python-list
How to get python class serializable and well parsed by JSON
Hi people, I've created very nice post here: http://stackoverflow.com/questions/5274690/how-to-get-python-class-serializable-and-well-parsed-by-json-custom-encoder-deco Yes, there are solutions over the internet, but nothing works for my custom types. If you could answer, please read it. Be happy! Arthur -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On 2011-03-11, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: On Thu, 10 Mar 2011 19:55:02 + (UTC), Grant Edwards invalid@invalid.invalid declaimed the following in gmane.comp.python.general: vt200 terminals. The vt200 wasn't a TV. It was a character-based, mostly-ANSI-escape-sequence, computer terminal connected via async I think the order went the other way -- I think most of the ANSI sequences were inherited from the VT52/VT100 terminals. Ah. I didn't mean to imply order, only that the vt200 used ANSI escape sequences with some extensions. -- Grant Edwards grant.b.edwardsYow! I am a jelly donut. at I am a jelly donut. gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On 2011-03-11, Anssi Saari a...@sci.fi wrote: Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? From what I remember, FORTRAN what probably the most popular. Pascal was also well supported and somewhat widely used (especially in academia). Then there was BLISS-32 for the low-level stuff. C seemed to be an afterthought and had a very kludged feel to it. VMS's file I/O didn't correspond very will with the C byte stream model, and C's view of line-termination didn't play well with everything else. My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) -- Grant Edwards grant.b.edwardsYow! Is it NOUVELLE at CUISINE when 3 olives are gmail.comstruggling with a scallop in a plate of SAUCE MORNAY? -- http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing user's agent and OS type
Thanks a lot Steven! The following code worked like a charm! ** agent = os.environ['HTTP_USER_AGENT'] # determination of user browser agent = agent.lower() if 'chrome' in agent: agent = 'Chrome' if 'firefox' in agent: agent = 'Firefox' if 'opera' in agent: agent = 'Opera' if 'safari' in agent: agent = 'Safari' if 'msie' in agent: agent = 'IE' *** I just want to have an idea of what browser a guest is using when hitting my webpage. http://www.superhost.gr/?show=log now includes also that filed in the logging process. But if i wanted the OS also? sys.platform is for retrieving the host OS type that the script is running and not the guest OS type. -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a very simple revision system for photos in python
On Mar 11, 9:56 am, Thomas W thomas.weh...@gmail.com wrote: I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. We are talking about large numbers of photos and some of them are large in size as well, but the functionality does not have to be a full fledged revision system, just handle checking out, checking in, handling conflicts, rollbacks etc, preferrably without storing complete copies of the files in question for every operation. Thanks for any input. :-) Most traditional revision systems excel at managing text, but suck at binary. I recall that Picassa has a revision system It occurs to me you could use Uuencoding to make binaries more amendable to handling by text-oriented revision systems -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a very simple revision system for photos in python
On 11/03/2011 16:05, Chris Hulan wrote: On Mar 11, 9:56 am, Thomas Wthomas.weh...@gmail.com wrote: I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. We are talking about large numbers of photos and some of them are large in size as well, but the functionality does not have to be a full fledged revision system, just handle checking out, checking in, handling conflicts, rollbacks etc, preferrably without storing complete copies of the files in question for every operation. Thanks for any input. :-) Most traditional revision systems excel at managing text, but suck at binary. I recall that Picassa has a revision system It occurs to me you could use Uuencoding to make binaries more amendable to handling by text-oriented revision systems I'm not sure there's much point in doing that. Certainly Subversion, and I imagine the other main RCS, handle binary data perfectly well; I mean, they don't stop when they come across a NUL byte or anything like that. You can't do much with the result except retrieve it, but I'm not sure that uuencodeing (or any other encoding) adds anything there, either. FWIW TortoiseSvn offers an image-diff utility which superimposes the two versions of an image with an alpha blend (if that's what it's called). It's basically the electronic equivalent of holding two sheets of paper up to the light. Don't know if this helps the OP, mind you. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 15:58:20 +, Grant Edwards wrote: On 2011-03-11, Anssi Saari a...@sci.fi wrote: Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? From what I remember, FORTRAN what probably the most popular. Pascal was also well supported and somewhat widely used (especially in academia). Then there was BLISS-32 for the low-level stuff. C seemed to be an afterthought and had a very kludged feel to it. VMS's file I/O didn't correspond very will with the C byte stream model, and C's view of line-termination didn't play well with everything else. My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) I don't remember much of any language being that portable. I do remember it was very easy to take DEC Fortran and compile it without much issue on SGI/Irix. Much more scary was a program converted to C from Fortran (there were precompiler for that) ran slow on Irix then straight Fortran. That was godsend for simulation engineers. I agree, VAX/VMS's i/o model was slow in C. In fortran it was fast as they did all the opens when the program started, regardless of where the open statement was in the code. I even had a legacy program, open and close a file in a subroutine (a no no) that ran fast; debugging code. DEC fortran only opened the file once. Had some way of deciding if a write was an overwrite or an append. The program ran fast as 'normal' (that being without the open and close). When I ported the program to an Moto 88000 daughter processor board, the program ran slow as hell. The 88000 board used a Fortran-C compiler, that obeyed the open and close statements. Each time the program ran that subroutine, It opened, then closed a log file. Each statement required the daughter board to call, via the q-bus, the host OS (VMS), stop, wait for VMS to open a file, continue, then stop, wait for VMS to close the file. The correction was easy, get rid of the legacy debug code. The coder had never used the debugger program or a profiler; amazing! Well after both, debugging code removed and a run through a profile, the code ran fast as hell. 20 sims in the time the microvax III did one. That was probably the only reason we didn't move off VAX/VMS (that and old programmer inertia). Inertia, friend and foe. Otherwise I worked with a host of government contractors, each with their own version of C; each used their specialized version to prevent tax payer contracts from going to another contractor. Thank goodness for standardization. Finally the DOD could drop CSC or EDS over priced contracts to maintain code. Unfortunately, could, should and did don't have the same meaning at the end of the day. GrayShark. -- http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing user's agent and OS type
2011/3/11 Νικόλαος Κούρας nikos.kou...@gmail.com: Thanks a lot Steven! The following code worked like a charm! ** agent = os.environ['HTTP_USER_AGENT'] # determination of user browser agent = agent.lower() if 'chrome' in agent: agent = 'Chrome' if 'firefox' in agent: agent = 'Firefox' if 'opera' in agent: agent = 'Opera' if 'safari' in agent: agent = 'Safari' if 'msie' in agent: agent = 'IE' *** For compatibility reasons (and because it's also WebKit based), Chrome also identifies itself as Safari. Just look at the User-Agent string you posted in the original message: Mozilla/5.0 (Windows; Windows NT 6.1) AppleWebKit/534.23 (KHTML, like Gecko) Chrome/11.0.686.0 Safari/534.23 Because of the order of your checks here (and because you're using if instead of elif), Chrome will be reported as Safari. I suppose you can fix it for now, but what happens when another browser comes along and claims to be MSIE-compatible? Notice that Chrome, like every other browser, introduces itself as Netscape 5 (Mozilla). After giving you the platform, Chrome correctly identifies itself as using WebKit as the rendering engine but then name-drops KHTML (which Webkit was forked from) and Gecko (Firefox's rendering engine) so that it will get the version of sites optimized for those engines (if they haven't identified webkit yet) before identifying itself as Chrome and then Safari (for the same reason). Like Steven said, User-Agent strings aren't all that useful for identifying the browser. I just want to have an idea of what browser a guest is using when hitting my webpage. http://www.superhost.gr/?show=log now includes also that filed in the logging process. But if i wanted the OS also? I don't think anyone fakes the OS, unless some website is being really stupid and claims Windows-only instead of IE-only. Just check for the OS name. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get python class serializable and well parsed by JSON
Common guys, help me, sweet heart to finish my job and go with my friend in the bar. Today we have a blues night :) Love it! Christina -- http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing user's agent and OS type
On 03/11/2011 09:59 AM, Νικόλαος Κούρας wrote: ** agent = os.environ['HTTP_USER_AGENT'] # determination of user browser agent = agent.lower() if 'chrome' in agent: agent = 'Chrome' if 'firefox' in agent: agent = 'Firefox' if 'opera' in agent: agent = 'Opera' if 'safari' in agent: agent = 'Safari' if 'msie' in agent: agent = 'IE' *** I just want to have an idea of what browser a guest is using when hitting my webpage. http://www.superhost.gr/?show=log now includes also that filed in the logging process. I now have a sudden urge to use Firefox's User-Agent Switcher add-on to change my UA string to something like Chrome Firefox MSIE Opera Safari Mozilla Lynx Links Dillo Win32 Windows Linux OpenBSD Mac OS X and browse your site :) -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get python class serializable and well parsed by JSON
Currently trying to pick up my ava http://en.gravatar.com/christinasanders21 for StackOverflow, which site I found very good for my questions, didn't I? Yes, and there are problem when adding a picture. Web admins should be careful. Can anyone explain me my problem ? : Christina -- http://mail.python.org/mailman/listinfo/python-list
Re: Just finished reading of What’s New In Python 3.0
On Thu, 10 Mar 2011 17:58:50 -0800, n00m wrote: http://docs.python.org/py3k/whatsnew/3.0.html What's the fuss abt it? Imo all is ***OK*** with 3k (in the parts I understand). Some of use Python 2.x as a general-purpose Unix scripting language. For that purpose, Python 3.x's obsession with Unicode is a sufficient reason to avoid it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a very simple revision system for photos in python
On 11 Mar, 17:23, Tim Golden m...@timgolden.me.uk wrote: On 11/03/2011 16:05, Chris Hulan wrote: On Mar 11, 9:56 am, Thomas Wthomas.weh...@gmail.com wrote: I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. We are talking about large numbers of photos and some of them are large in size as well, but the functionality does not have to be a full fledged revision system, just handle checking out, checking in, handling conflicts, rollbacks etc, preferrably without storing complete copies of the files in question for every operation. Thanks for any input. :-) Most traditional revision systems excel at managing text, but suck at binary. I recall that Picassa has a revision system It occurs to me you could use Uuencoding to make binaries more amendable to handling by text-oriented revision systems I'm not sure there's much point in doing that. Certainly Subversion, and I imagine the other main RCS, handle binary data perfectly well; I mean, they don't stop when they come across a NUL byte or anything like that. You can't do much with the result except retrieve it, but I'm not sure that uuencodeing (or any other encoding) adds anything there, either. FWIW TortoiseSvn offers an image-diff utility which superimposes the two versions of an image with an alpha blend (if that's what it's called). It's basically the electronic equivalent of holding two sheets of paper up to the light. Don't know if this helps the OP, mind you. TJG Hmm ... encoding my photos using uuencoding will just eat up space, it adds about 40% or so ( if I remember correctly ) to the total size of the encoded file, a file which may allready be 10+ MB. That`s the problem using git and friends as well; it creates full copies of the files and that`s part of the thing I want to avoid, if possible. Sounds like this is a task for more experienced users than me, but I`m gonna take a stab at it anyway, allthough my ideas for a solution is pretty basic and simple. Anyway, thanks a lot for your input :-) Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Passing Functions
On 3/11/2011 5:49 AM, yoro wrote: I've found the error, I had to type in: for node in nodeTable: if node != 0 and Node.visited == False: That's just your first error. (Also, you shouldn't have anything but Node items in nodeTable, so you don't need the node != 0.) The biggest problem is at #Values to assign to each node class Node: distFromSource = infinity previous = invalid_node visited = False Those are variables of the entire class. Every instance of Node shares the same variables. You need class Node: def __init__(self) : self.distFromSource = infinity self.previous = invalid_node self.visited = False John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Compile time evaluation of dictionaries
On 3/10/2011 8:23 AM, Gerald Britton wrote:
Today I noticed that an expression like this:
one:%(one)s two:%(two)s % {one: is the loneliest number, two:
can be as bad as one}
could be evaluated at compile time, but is not:
CPython barely evaluates anything at compile time.
John Nagle
--
http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing user's agent and OS type
On 11 Μαρ, 18:39, Tim Chase python.l...@tim.thechases.com wrote: On 03/11/2011 09:59 AM, Νικόλαος Κούρας wrote: ** agent = os.environ['HTTP_USER_AGENT'] # determination of user browser agent = agent.lower() if 'chrome' in agent: agent = 'Chrome' if 'firefox' in agent: agent = 'Firefox' if 'opera' in agent: agent = 'Opera' if 'safari' in agent: agent = 'Safari' if 'msie' in agent: agent = 'IE' *** I just want to have an idea of what browser a guest is using when hitting my webpage. http://www.superhost.gr/?show=log now includes also that filed in the logging process. I now have a sudden urge to use Firefox's User-Agent Switcher add-on to change my UA string to something like Chrome Firefox MSIE Opera Safari Mozilla Lynx Links Dillo Win32 Windows Linux OpenBSD Mac OS X and browse your site :) -tkc ROFLMAO !!! I guess the previous code that i corrected after seeing Benjamin's response: == # determination of user browser agent = agent.lower() if 'chrome' in agent: agent = 'Chrome' elif 'firefox' in agent: agent = 'Firefox' elif 'opera' in agent: agent = 'Opera' elif 'safari' in agent: agent = 'Safari' elif 'msie' in agent: agent = 'Explorer' else: agent = 'Other' would still be failing since it seems that it is a matter of order what response will be presented. So if you use firefox for browser with the UA string tweaker on with a string of Chrome Firefox MSIE Opera Safari Mozilla Lynx Links Dillo Win32 Windows Linux OpenBSD Mac OS X and browse my site the result will always be 'Chrome' since the 1st match will always be TRUE and nothing else get checked. :-) But in a real example if a UA string contains the substring 'Chrome' then the browser must be Chrome(there is no point containing the substring 'Firefox' in UA when the browser is 'Chrome', unlike Mozilla which is a common subtring to both of the browsers UA) -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
On Mar 10, 9:25 pm, Robert sigz...@gmail.com wrote: Is there a push to one toolkit or the other? -- Robert I've mainly used Tkinter for a few reasons: - It's what I already know - It's pretty simple - Most people who have Python have it too, so there's no crazy dependencies - It looks decent on Gnome and KDE, good on Winodws and Mac - I can develop a full featured GUI in a few hours, no sweat (partly because it's simple, partly because I know it) I've tried PyGTK and PyQt before, but they were both more complicated than I'd like. I decided to stick with Tkinter because I was proficient with it. Rafe -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't Want Visitor To See Nuttin'
On Fri, Mar 11, 2011 at 3:54 AM, Ian Kelly ian.g.ke...@gmail.com wrote: On Wed, Mar 9, 2011 at 2:01 PM, Victor Subervi victorsube...@gmail.com wrote: titleMaya 2012: Transform At the Source/title Yow. You're designing a Maya 2012 website to help some travel company bilk gullible people out of thousands of dollars? I would be ashamed to have anything to do with this. Um...just for the record, these guys have ben featured on the FRONT PAGES OF: The Wall Street Journal The Los Angeles Times The San Francisco Chronicle and have appeared on: Eye-To-Eye with Connie Chung CNN's Travel Guide and National Geographic's Travel Magazine called them the graddaddy of metaphysical tours. If you'll go to the About Us page you'll see their photo with the Dalai Lama. They're ligit :) Beno -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't Want Visitor To See Nuttin'
On Fri, Mar 11, 2011 at 4:26 AM, Dennis Lee Bieber wlfr...@ix.netcom.comwrote: On Thu, 10 Mar 2011 18:00:10 -0800 (PST), alex23 wuwe...@gmail.com declaimed the following in gmane.comp.python.general: He's comp.lang.python's version of Sisyphus. Or maybe Sisyphus' boulder...I forget where I was going with this. The boulder -- given that we are the ones suffering... G OK, fine, don't respond. The page works. I'm changing names and email addresses. CU as someone else. Bye, Beno -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On 2011-03-11, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: On Fri, 11 Mar 2011 11:17:08 +0200, Anssi Saari a...@sci.fi declaimed the following in gmane.comp.python.general: Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) The system language was BLISS; though I don't know of any end-users programming in it. I think I did, once, when I need to do something involving 128-bit integers. Or maybe I just used assembly language -- BLISS wasn't much higher level than assembly. I also seem to remember occasionally seeing stuff written in BLISS on DECUS tapes, but it wasn't at all common. My 20 years on VMS was primarily F77, with some Pascal and some C. -- Grant Edwards grant.b.edwardsYow! But was he mature at enough last night at the gmail.comlesbian masquerade? -- http://mail.python.org/mailman/listinfo/python-list
IDLE doesn't start
Hi,
I just installed Python 3.1.1 via link in the book Python Programming for the
absolute beginner third edition. But IDLE won't start. When I try to open IDLE
the Windows hourglass just flashes briefly but nothing happens after that. No
error messages.
My operating system is XP Professional Version 2002 Service Pack 3.
I have uninstalled and reinstalled several times but nothing changes. I select
Install for All Users during the installation.
I have also tried installing instead the 3.2 version from the python.org
website but the same issue arises - IDLE doesn't launch.
When I open a command prompt, and type:
c:\python32\python.exe -m idlelib.idle
The message that comes is as follows:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Ceonnc:\python32\python.exe -m idlelib.idle
Traceback (most recent call last):
File c:\python32\lib\runpy.py, line 160, in _run_module_as_main
__main__, fname, loader, pkg_name)
File c:\python32\lib\runpy.py, line 73, in _run_code
exec(code, run_globals)
File c:\python32\lib\idlelib\idle.py, line 11, in module
idlelib.PyShell.main()
File c:\python32\lib\idlelib\PyShell.py, line 1374, in main
root = Tk(className=Idle)
File c:\python32\lib\tkinter\__init__.py, line 1674, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, want
objects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following directories:
{C:\IBMTOOLS\Python22\tcl\tcl8.4} C:/IBMTOOLS/Python22/tcl/tcl8.5 c:/python3
2/lib/tcl8.5 c:/lib/tcl8.5 c:/lib/tcl8.5 c:/library c:/library c:/tcl8.5.9/libra
ry c:/tcl8.5.9/library
C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl: version conflict for package Tcl: ha
ve 8.5.9, need exactly 8.4
version conflict for package Tcl: have 8.5.9, need exactly 8.4
while executing
package require -exact Tcl 8.4
(file C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl line 19)
invoked from within
source C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl
(uplevel body line 1)
invoked from within
uplevel #0 [list source $tclfile]
Someone told me: “You certainly have a TCL_LIBRARY environment variable set on
your system,
it should be removed”.
How do I remove TCL_LIBRARY, or do I change some numbers somewhere, and isn’t
it risky to tinker with the Python settings already on my computer?
Thanks for any help, I really would like to get going with Python!
--
http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 11:52:13 +, Jorgen Grahn wrote: On Thu, 2011-03-10, Martin Gregorie wrote: On Thu, 10 Mar 2011 20:31:11 +, Grant Edwards wrote: You tricked me by saying only DEC VAX/VMS programmers would know what it was. In fact, many, many Unix programmers knew about curses (and still do) and very few VMS programmers ever did. C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. From the context the only DEC VAX/VMS programmers remark applied to the VT-100. However, the OP is wrong about that - VT-100s were well-known and popular devices in the 8-bit microprocessor world too, together with assorted clones. In addition, many other terminals had a VT-100 emulation mode. IIRC all the Wyse terminals had that. But he wrote VT-200, not VT-100. I assumed he meant those (vt200) had some exotic graphics mode. The VT-xxx series was pretty heterogenous, although most of us think of them as more or less fancy VT-100s. You're right - he did say VT-200. Can't remember using one. However, I did buy a used VT-103 at some point and dumped it fairly rapidly as it had no manuals and I couldn't get it to work as a terminal (no wonder - I've since found out that it was really a standalone box with an LSI-11/23 crammed into the VT-100 box). It got swapped for a Wyse 120 - an excellent terminal with a white phosphor rather than green. Grayshark was right too: the ANSI control code standard preceded the VT-100 - I live and learn - and because of that there was no commonality between VT-50/52 and VT-100 escape codes. Details here: http://vt100.net/vt_history BTW, there was no such thing as a VT-200 - there was a VT-220 text terminal (which I think the OP was remembering) and the VT-240 and 241 terminals, which were totally different graphics terminals that accepted Tektronics graphics commands: comparing a VT-220 to a VT-240/241 would be like comparing an Epson dot-matric printer to an HP 7485 plotter! -- martin@ | Martin Gregorie gregorie. | Essex, UK org | -- http://mail.python.org/mailman/listinfo/python-list
Re: send function keys to a legacy DOS program
On Mar 10, 7:58 pm, Justin Ezequiel justin.mailingli...@gmail.com wrote: Greetings, We have an old barcode program (MSDOS and source code unavailable.) I've figured out how to populate the fields (by hacking into one of the program's resource files.) However, we still need to hit the following function keys in sequence. F5, F2, F7 Is there a way to pipe said keys into the program? Use expect on unix or pexpect if you're looking for the python implementation. -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 15:53:20 +, Grant Edwards wrote: I think the order went the other way -- I think most of the ANSI sequences were inherited from the VT52/VT100 terminals. Ah. I didn't mean to imply order, only that the vt200 used ANSI escape sequences with some extensions. I got that wrong: ANSI defined the VT-100 control codes. See above. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | -- http://mail.python.org/mailman/listinfo/python-list
Re: Just finished reading of What’s New In Python 3.0
On Thu, Mar 10, 2011 at 11:59 PM, n00m n...@narod.ru wrote: Fitzgerald had been an alcoholic since his college days, and became notorious during the 1920s for his extraordinarily heavy drinking, leaving him in poor health by the late 1930s. According to Zelda's biographer, Nancy Milford, Scott claimed that he had contracted tuberculosis, but Milford dismisses it as a pretext to cover his drinking problems. However, Fitzgerald scholar Matthew J. Bruccoli contends that Fitzgerald did in fact have recurring tuberculosis, and Nancy Milford reports that Fitzgerald biographer Arthur Mizener said that Scott suffered a mild attack of tuberculosis in 1919, and in 1929 he had what proved to be a tubercular hemorrhage. It has been said that the hemorrhage was caused by bleeding from esophageal varices. N00m? That's an ad-hominem against your own quote. :) You're illustrating your point? Yes, being able to maintain two or more competing, and sometimes even conflicting, hypotheses in one's mind at the same time is crucial to the scientific method. Whether one person did so while drinking too much or not. -- http://mail.python.org/mailman/listinfo/python-list
Re: send function keys to a legacy DOS program
On 3/10/2011 4:58 PM Justin Ezequiel said... Greetings, We have an old barcode program (MSDOS and source code unavailable.) I've figured out how to populate the fields (by hacking into one of the program's resource files.) However, we still need to hit the following function keys in sequence. F5, F2, F7 Is there a way to pipe said keys into the program? I know it's not really a python problem but I got nowhere else to go. I've tried other barcode solutions but none give the same output. WSH sendkeys? Emile -- http://mail.python.org/mailman/listinfo/python-list
Two random lists from one list
Hello All, I am just looking to see if there is perhaps a more efficient way of doing this below (works -- creates two random teams from a list of players). Just want to see what the experts come up with for means of learning how to do things better. Thanks for any responses! ### import random players = [jake, mike, matt, rich, steve, tom, joe, jay] teamA = random.sample(players, 4) print teamA teamB = [] for p in players: if p not in teamA: teamB.append(p) print teamB -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
You can use sets: teamA = set(random.sample(players, 4)) teamB = set(players) - teamA HTH -- Miki Tebeka miki.teb...@gmail.com http://pythonwise.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
I used wxPython in several occasion, was very happy with it. Free, great docs, great community. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get python class serializable and well parsed by JSON
Ok, guys. I used my bro account. Now I'm here. By the way is anybody going to be in Paris Sunday night ? I invite you if you would help :))) Kiss, well yet 30 minutes at work and I'm free... Sophie -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a very simple revision system for photos in python
On Fri, Mar 11, 2011 at 6:56 AM, Thomas W thomas.weh...@gmail.com wrote: I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. We are talking about large numbers of photos and some of them are large in size as well, but the functionality does not have to be a full fledged revision system, just handle checking out, checking in, handling conflicts, rollbacks etc, preferrably without storing complete copies of the files in question for every operation. Thanks for any input. :-) Check out the rolling_checksum portion of backshift, and pyrabinf: http://stromberg.dnsalias.org/svn/backshift/trunk/ http://stromberg.dnsalias.org/svn/pyrabinf/ You could probably use a variable-length, shift-resistant blocking to chop the inputs into binary chunks, and then make a checkin consist of a series pointers (pathnames in a filesystem trie or keys into something like mongodb) to those chunks, to avoid duplications. Actually, something like this could probably be wrapped around Mercurial or SVN or whatever, depending on what your needs are. I originally set up pyrabinf as a wrapper for a preexisting C++ Rabin Fingerprinting algorithm; this is probably the more traditional way of doing such blocking. However, I've been playing around with rolling my own algorithm in pure python (and also with Cython) using something that boils down to a rolling (boxcar) sum of the bytes, so it'll work in pypy. So far, it seems to be working fine. Rabin Fingerprinting should be less subject to generating the same blocking for a file that has two adjacent bytes swapped, but in my project, and I suspect in yours, that doesn't really matter. But also check out http://mercurial.selenic.com/wiki/BfilesExtension - this might be less time consuming for you, better leveraging an existing tool. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
On Mar 11, 1:21 pm, noydb jenn.du...@gmail.com wrote: Hello All, I am just looking to see if there is perhaps a more efficient way of doing this below (works -- creates two random teams from a list of players). Just want to see what the experts come up with for means of learning how to do things better. Thanks for any responses! ### import random players = teamA = random.sample(players, 4) print teamA teamB = [] for p in players: if p not in teamA: teamB.append(p) print teamB How about: players = [jake, mike, matt, rich, steve, tom, joe, jay] random.shuffle(players) teamA, TeamB = players[:4],players[4:] -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
noydb wrote: Hello All, I am just looking to see if there is perhaps a more efficient way of doing this below (works -- creates two random teams from a list of players). Just want to see what the experts come up with for means of learning how to do things better. Thanks for any responses! ### import random players = [jake, mike, matt, rich, steve, tom, joe, jay] teamA = random.sample(players, 4) print teamA teamB = [] for p in players: if p not in teamA: teamB.append(p) print teamB How about random.shuffle(players) teamA = players[:4] teamB = players[4:] teamA, teamB (['tom', 'mike', 'jay', 'rich'], ['jake', 'matt', 'joe', 'steve']) -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
Catenate the lists into a new list. Then randomize the order of the new list by iterating over each element in turn, swapping it with a random element elsewhere in the same list (optionally including swapping it with itself - that's easier and still gives good randomization). This gives linear time (n+m). On Fri, Mar 11, 2011 at 10:21 AM, noydb jenn.du...@gmail.com wrote: Hello All, I am just looking to see if there is perhaps a more efficient way of doing this below (works -- creates two random teams from a list of players). Just want to see what the experts come up with for means of learning how to do things better. Thanks for any responses! ### import random players = [jake, mike, matt, rich, steve, tom, joe, jay] teamA = random.sample(players, 4) print teamA teamB = [] for p in players: if p not in teamA: teamB.append(p) print teamB -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
On 03/11/2011 12:21 PM, noydb wrote: I am just looking to see if there is perhaps a more efficient way of doing this below (works -- creates two random teams from a list of players). Just want to see what the experts come up with for means of learning how to do things better. ### import random players = [jake, mike, matt, rich, steve, tom, joe, jay] teamA = random.sample(players, 4) print teamA teamB = [] for p in players: if p not in teamA: teamB.append(p) print teamB I'd be tempted to do temp = players[:] # copy players random.shuffle(temp) # you could directly shuffle players # if you don't care about mangling it team_a = temp[:4] team_b = temp[4:] del temp # optional This assumes you want balanced-ish teams. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get python class serializable and well parsed by JSON
I can not open your link. Are you sure you provided the correct link? - Gennadiy gennad.zlo...@gmail.com On Fri, Mar 11, 2011 at 10:36 PM, Arthur Mc Coy 1984docmc...@gmail.comwrote: Currently trying to pick up my ava http://en.gravatar.com/christinasanders21 for StackOverflow, which site I found very good for my questions, didn't I? Yes, and there are problem when adding a picture. Web admins should be careful. Can anyone explain me my problem ? : Christina -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Using MSW GUI DLLS: PYWIN32, WMI, WINSHELL
I'm using MSW DLL calls thru the 3 packages listed as well as ctypes calls on Win7 64-bit. I believe all the packages were developed in the XP days. Some calls just don't seem to work consistently on Win7. Specifically, I'm trying to reposition and resize application main windows and change their minimized or zoomed state to "normal". Sometimes the calls work, some time they just don't. I've scoured all the DLL library calls and haven't found any unobvious dependencies. Foe example, the calls to IsIconic always returns True even when the app window has been restored. Another: A call to ctypes.windll.user32.ShowWindow( hwnd, win32con.SW_MAXIMIZE ) *must* be made just before a call to ctypes.windll.user32.ShowWindow( hwnd, win32con.SW_NORMAL ) to consistently get it to go NORMAL from a different state. But, then there is an annoying full screen-sized flash of white that happens. This never happens when manually clicking on the iconized Taskbar button. Obviously, Win7 is doing something different from the obvious. Are there any insights to this behaviors ? -- http://mail.python.org/mailman/listinfo/python-list
How to use python JSON custom parser in example ?
Hi all, I reuploaded my message. http://stackoverflow.com/questions/5277180/how-to-use-python-json-custom-parser-in-example From now no brother accounts. Huh :) Sophie -- http://mail.python.org/mailman/listinfo/python-list
Re: IDLE doesn't start
It seems that you have already had Python 2.2 installed in the directory
C:/IBMTOOLS/Python22
Can you open the console and type there next commands and provide the
output?
echo %TCL_LIBRARY%
echo %TK_LIBRARY%
echo %PYTHONPATH%
You can unset environment variable in 'my computer' properties, more details
are, for example, here
http://vlaurie.com/computers2/Articles/environment.htm
- Gennadiy gennad.zlo...@gmail.com
On Fri, Mar 11, 2011 at 11:58 PM, Ceonn Bobst ceonnbo...@yahoo.com wrote:
Hi,
I just installed Python 3.1.1 via link in the book Python Programming for
the absolute beginner third edition. But IDLE won't start. When I try to
open IDLE the Windows hourglass just flashes briefly but nothing happens
after that. No error messages.
My operating system is XP Professional Version 2002 Service Pack 3.
I have uninstalled and reinstalled several times but nothing changes. I
select Install for All Users during the installation.
I have also tried installing instead the 3.2 version from the
python.orgwebsite but the same issue arises - IDLE doesn't launch.
When I open a command prompt, and type:
c:\python32\python.exe -m idlelib.idle
The message that comes is as follows:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Ceonnc:\python32\python.exe -m idlelib.idle
Traceback (most recent call last):
File c:\python32\lib\runpy.py, line 160, in _run_module_as_main
__main__, fname, loader, pkg_name)
File c:\python32\lib\runpy.py, line 73, in _run_code
exec(code, run_globals)
File c:\python32\lib\idlelib\idle.py, line 11, in module
idlelib.PyShell.main()
File c:\python32\lib\idlelib\PyShell.py, line 1374, in main
root = Tk(className=Idle)
File c:\python32\lib\tkinter\__init__.py, line 1674, in __init__
self.tk = _tkinter.create(screenName, baseName, className,
interactive, want
objects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following
directories:
{C:\IBMTOOLS\Python22\tcl\tcl8.4} C:/IBMTOOLS/Python22/tcl/tcl8.5
c:/python3
2/lib/tcl8.5 c:/lib/tcl8.5 c:/lib/tcl8.5 c:/library c:/library
c:/tcl8.5.9/libra
ry c:/tcl8.5.9/library
C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl: version conflict for package
Tcl: ha
ve 8.5.9, need exactly 8.4
version conflict for package Tcl: have 8.5.9, need exactly 8.4
while executing
package require -exact Tcl 8.4
(file C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl line 19)
invoked from within
source C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl
(uplevel body line 1)
invoked from within
uplevel #0 [list source $tclfile]
Someone told me: “You certainly have a TCL_LIBRARY environment variableset on
your system,
it should be removed”.
How do I remove TCL_LIBRARY, or do I change some numbers somewhere, and
isn’t it risky to tinker with the Python settings already on my computer?
Thanks for any help, I really would like to get going with Python!
--
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--
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Re: IDLE doesn't start
Ceonn Bobst wrote:
snip
When I open a command prompt, and type:
c:\python32\python.exe -m idlelib.idle
The message that comes is as follows:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Ceonnc:\python32\python.exe -m
idlelib.idle
Traceback (most recent call last):
File c:\python32\lib\runpy.py, line 160, in _run_module_as_main
__main__, fname, loader, pkg_name)
File c:\python32\lib\runpy.py, line 73, in _run_code
exec(code, run_globals)
File c:\python32\lib\idlelib\idle.py, line 11, in module
idlelib.PyShell.main()
File c:\python32\lib\idlelib\PyShell.py, line 1374, in main
root = Tk(className=Idle)
File c:\python32\lib\tkinter\__init__.py, line 1674, in __init__
self.tk = _tkinter.create(screenName, baseName, className,
interactive,
want objects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following
directories: {C:\IBMTOOLS\Python22\tcl\tcl8.4}
C:/IBMTOOLS/Python22/tcl/tcl8.5 c:/python3 2/lib/tcl8.5
c:/lib/tcl8.5
c:/lib/tcl8.5 c:/library c:/library c:/tcl8.5.9/libra ry
c:/tcl8.5.9/library C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl:
version
conflict for package Tcl: ha ve 8.5.9, need exactly 8.4
version conflict for package Tcl: have 8.5.9, need exactly 8.4
while executing
package require -exact Tcl 8.4
(file C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl line 19)
invoked from within
source C:/IBMTOOLS/Python22/tcl/tcl8.4/init.tcl
(uplevel body line 1)
invoked from within
uplevel #0 [list source $tclfile]
Someone told me: “You certainly have a TCL_LIBRARY environment
variable
set on your system, it should be removed”.
How do I remove TCL_LIBRARY, or do I change some numbers somewhere,
and
isn’t it risky to tinker with the Python settings already on my
computer?
Thanks for any help, I really would like to get going with Python!
Hello,
You have an older version of Python on your machine in C:/IBMTOOLS.
It's likely that the TCL_LIBRARY is pointing to the version of TCL
installed there, and this is causing problems for your more modern
Python install.
You change change Windows environment variables using the instructions
here: http://support.microsoft.com/kb/310519. Changing the
environment variable is the documented solution for this - see
http://bugs.python.org/issue5528.
If you keep a note of the environment variable you can always
reinstate it later.
You can find some comments about the purpose of the IBMTOOLS folder at
http://forum.thinkpads.com/viewtopic.php?f=8t=216.
All the best,
Kev
--
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Re: Purely historic question: VT200 text graphic programming
On 2011-03-11, Martin Gregorie martin@address-in-sig.invalid wrote: BTW, there was no such thing as a VT-200 - there was a VT-220 text terminal (which I think the OP was remembering) and the VT-240 and 241 terminals, which were totally different graphics terminals that accepted Tektronics graphics commands: comparing a VT-220 to a VT-240/241 would be like comparing an Epson dot-matric printer to an HP 7485 plotter! The 220 and 240/241 weren't fundamentally different display technologies they way a dot-matrix differs from a pen-plotter. Both were raster-scan CRT tubes (AFAICT, they used identical CRT tubes and driver hardwar). When used in text mode, the 240 wasn't really any different than the 220. But, the 240 also supported a graphics mode that allowed apps to draw using vector commands). I remember writing an app using the ReGIS command set to draw a clock with a moving second hand on a 240. Comparing a vt220 to a vt240 is like comparing a black-and-white epson 9-pin dot-matrix printer that can't do graphics with a balck-and-white epson 9-pin dot-matrix printer than can do graphics. -- Grant Edwards grant.b.edwardsYow! I've got a COUSIN at who works in the GARMENT gmail.comDISTRICT ... -- http://mail.python.org/mailman/listinfo/python-list
Re: Tk MouseWheel Support
On Thu, 10 Mar 2011 21:56:52 +0100, Alexander Kapps
alex.ka...@web.de wrote:
snip
Can you post your code please (if it's too long, strip it down to
the smallest program which still shows the problem.)
First, thanks to MRAB for showing me how to get the wheel working.
In the following code (Windows only), rolling the wheel doesn't invoke
the event method. If I change the mouse wheel binding to
self.master.bind... the event gets called and the scrolling works.
Note that the scrolling occurs even when the mouse is outside the
listbox. I guess I'll have to look at the mouse position when I enter
the wheel_event method to see if the mouse is over the listbox.
# mouse wheel in listbox
import Tkinter as tk
class Application(tk.Frame):
def __init__(self, master=None):
tk.Frame.__init__(self, master)
self.grid()
self.button = tk.Button(self, text='Button')
self.button.grid(row=0, column=0)
self.yscroll = tk.Scrollbar(self, orient=tk.VERTICAL)
self.yscroll.grid(row=1, column=1, sticky=tk.N+tk.S)
self.list = tk.Listbox(self, selectmode=tk.SINGLE, width=40,
height=5,
yscrollcommand=self.yscroll.set)
self.list.grid(row=1, column=0, sticky=tk.N+tk.S+tk.E+tk.W)
self.yscroll[command] = self.list.yview
self.list.bind(MouseWheel, self.wheel_event)
for i in xrange(10):
self.list.insert(tk.END, 'line ' + str(i))
def wheel_event(self, evt):
lines = evt.delta // 120
self.list.yview_scroll(-lines, tk.UNITS)
root = tk.Tk()
root.geometry('300x300+400+200')
root.title(' Wheel Test')
app = Application(master = root)
root.mainloop()
--
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Re: Use-cases for alternative iterator
On 3/11/2011 1:43 AM, Steven D'Aprano wrote: The iter() built-in takes two different forms, the familiar iter(iterable) we all know and love, and an alternative form: iter(callable, sentinel) E.g.: T = -1 def func(): ... global T ... T += 1 ... return T ... it = iter(func, 3) next(it) 0 next(it) 1 next(it) 2 next(it) Traceback (most recent call last): File stdin, line 1, inmodule StopIteration I've never seen this second form in actual code. Does anyone use it, and if so, what use-cases do you have? Looking through Peter's nice list of real use cases, I see two categories: adapting an iterator-like function to Python's protocol; stopping an iterator before its normal exhaustion. An example of the latter: suppose a file consists of header and body separated by a blank line. An opened file is an iterable, but its iterator only stops at eof. To process the two parts separately (using example from Peter's list): for l in iter(f.readline,''): process header line for l in f: process body line (I am pretty sure that there are no buffer screwups with stop and restart since f iterator should call f.readline internally.) Alternative is explicit if l == '': break in first loop. I suspect the two param form, still rather new and unusual, is used less that is could, and perhaps should be. I am glad you raised the question to get me thinking about it. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: IDLE doesn't start
On 3/11/2011 12:58 PM, Ceonn Bobst wrote: Someone told me: “You certainly have a TCL_LIBRARY environment variable set on your system, it should be removed”. Someone else posted this week about the same problem (though from a different cause) and solution. How do I remove TCL_LIBRARY, or do I change some numbers somewhere, and Open Windows help, search 'environmental variable' and it should offer you Add or change the value of ... isn’t it risky to tinker with the Python settings already on my computer? That is not a Python setting. If you use any of the IBM utility programs that use the old Python2.2 and tcl/tk installation, and if any such program requires the TCL_LIBRARY setting (which it really ought not to, since a proper Python installation does not, at least not now), then you will have to work around the conflict with .bat files. But I would first write down the current setting before deleting it, so you could restore it if necessary. I once had a similar py2.2 installation on my HP, but I deleted it several years ago as I never used any program that used it. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a very simple revision system for photos in python
On 3/11/2011 6:56 AM, Thomas W wrote: I`m thinking about creating a very simple revision system for photos in python, something like bazaar, mercurial or git, but for photos. The problem is that handling large binary files compared to plain text files are quite different. Has anybody done something like this or have any thoughts about it, I`d be very grateful. If something like mercurial or git could be used and/or extended/customized that would be even better. Alienbrain (http://www.alienbrain.com/) does this. That's what game companies use for revision control, where data includes images, motion capture files, game levels, and music, as well as code. There's also Autodesk Vault, which does a similar job for engineering data. One key to doing this well is the ability to talk about a group of revisions across multiple files as an entity, without having to be the owner of those files. You need to say what goes into a build of a game, or a revision of a manufactured product. You also need really good tools to show the differences between revisions. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
Robert sigz...@gmail.com said : Is there a push to one toolkit or the other? If you are just now getting started, I would honestly suggest you save a whole lot of time and dive straight into PyQt. I've tried most 'em over the years (including some now discontinued), and in my experience Qt is way above the rest, especially as far as consistency and productivity are concerned. The Python bindings are very mature and well maintained, and go a long way attenuating the evil C++ roots. I havent tried Nokia's equivalent (PySide). I'm not sure what its fate will turn out, given the company's change of heart and Microsoft honeymoon. At least PyQt is't going anywhere soon. YMMV, of course :) -- http://mail.python.org/mailman/listinfo/python-list
enhanced map function
Hi, The build-in map functions looks quite nice but it requests the iterables to be of the same length or otherwises will file with None (most of time fails the function). Just wondering if there are already enhancement work done with it? I did some simple code but it will handle list without nesting only. I am looking for examples that could hand input of a = [2,3], b=4 and a=[1,[2,3],4], b=[5,[6,7,8],9,10]. That means if the nesting structure is the same, enhanced map function will automatically extend the shorter list using the last element. Or if the input is a constant at the first point, then it feeds constant value to all other iterable combinations. Any tip is appreciated. -Patrick. def Add (x,y): return x+y def Bmap(function, *args): num = 0 for iter in args[0:]: if num len(iter): num = len(iter) nlist=[] for i in range(0,num,1): fargs = [] for iter in args[0:]: if len(iter) i: fargs.append(iter[i]) continue fargs.append(iter[-1]) nlist.append(function(*fargs)) return nlist if __name__ == '__main__': a = [2,3] b = [4,5,8] print Bmap (Add, a, b) -- http://mail.python.org/mailman/listinfo/python-list
Calling C++ Modules in Python
Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). Thanks -Patrick -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling C++ Modules in Python
On Mar 11, 2011 4:23 PM, Patrick zxpat...@gmail.com wrote: Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). Thanks -Patrick -- I believe the document was referring to writing your own python modules in C, not wrapping existing libraries. -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling C++ Modules in Python
Hi Patrick, I'm using SWIG in my project. C++ code is wrapped and can be used in python as custom module. You should create a swig module.i file to describe headers upon which that module will be built. You should be certain about what you are going to use - boost library, swig or something else, try it and if any problems post here :) Yours, Sophie -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
On Fri, Mar 11, 2011 at 12:54 PM, Fred Pacquier xne...@fredp.lautre.netwrote: Robert sigz...@gmail.com said : Is there a push to one toolkit or the other? If you are just now getting started, I would honestly suggest you save a whole lot of time and dive straight into PyQt. I've tried most 'em over the years (including some now discontinued), and in my experience Qt is way above the rest, especially as far as consistency and productivity are concerned. The Python bindings are very mature and well maintained, and go a long way attenuating the evil C++ roots. I havent tried Nokia's equivalent (PySide). I'm not sure what its fate will turn out, given the company's change of heart and Microsoft honeymoon. At least PyQt is't going anywhere soon. Didn't Nokia acquire Trolltech (and hence the rights to much if not all of Qt) in 2008? I'm not at all sure Qt's future is as bright as one might wish for. They've already declared that Qt will not be ported to Windows Mobile in any official way, and of course mobile (not necessarily Windows Mobile) is where just about everything is headed. Actually, for something that's very cross-platform, you might check this out: http://radicalbreeze.com/ Bryan can be a bit of a goober, but it sounds like he's successfully implemented a great idea for quickly and easily writing cross-platform applications. Illumination even gives you the full Adobe Flex, Android Java, iOS Obj-C and Python source code to the projects you create. Making it a great way to prototype new projects, or learn new languages. I've still got a soft spot for Pyjamas though - it's opensource. -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
Robert wrote: Is there a push to one toolkit or the other? I use Dabo, which wraps wxPython. -- --OKB (not okblacke) Brendan Barnwell Do not follow where the path may lead. Go, instead, where there is no path, and leave a trail. --author unknown -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling C++ Modules in Python
On Fri, Mar 11, 2011 at 1:15 PM, Patrick zxpat...@gmail.com wrote: Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). I guess it should be asked: easy for who? easy is always relative to some context. If you're planning to stay with CPython and C++ forevermore, then Cython is a nice way of gluing the two. Cython looks like Python code, but it gives you access to C and C++ code and data as well as CPython code and data. If you're planning to support your C++ code with more languages than CPython, you might be better off with SWIG. If you really do want to do the task the old way, you're probably best off copying some preexisting module with a maximize-the-developers-rights license (like Apache, MIT or 3 clause BSD), and modifying that. If you want to be able to move easily to pypy, I might suggest coming up with a C wrapper for your C++ code, and then accessing the C code using ctypes. That should work in CPython and pypy, and it looks like jython might support this soon as well. -- http://mail.python.org/mailman/listinfo/python-list
PEP for module naming conventions
I need to be better informed on naming conventions for modules. For instance, I need to create a new module and I want to make sure that the module name will not conflict with any future or current python system module names. There may be a PEP for this, if so, a URL to such a PEP would suffice for my inquiry. Also, if there is an index of PEPs, a link to such would also be appreciated. thanks -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling C++ Modules in Python
Thanks Sophie for the information. Yes, right now I am not certain about what I am going to use for I was hoping for a non-intrusive way to expose existing C++ libraries to python. However, both solutions (BOOST, SWIG) listed here require the recompilation of libraries?! It is ok for small applications but will be hard for big software from big companies. The reason is that even companies are willing to rebuild their own libraries with those wrappers or decorations added(though needs approves from all sorts of departments :)), they can't force their 3rd-party developers/users. Correct me if I am wrong. Cheers, -Patrick. On Mar 11, 4:32 pm, Sophie Sperner sophie.sper...@gmail.com wrote: Hi Patrick, I'm using SWIG in my project. C++ code is wrapped and can be used in python as custom module. You should create a swig module.i file to describe headers upon which that module will be built. You should be certain about what you are going to use - boost library, swig or something else, try it and if any problems post here :) Yours, Sophie -- http://mail.python.org/mailman/listinfo/python-list
Re: PEP for module naming conventions
Hi, Have you read PEP 8? http://python.org/dev/peps/pep-0008/ I don't think it's possible to be sure that the name of your module won't conflict with system module name (if you'll follow conventions). You can find the list of all PEPs at http://python.org/dev/peps/ -- David Marek dav...@atrey.karlin.mff.cuni.cz http://davidmarek.cz On Fri, Mar 11, 2011 at 10:52 PM, Tim Johnson t...@johnsons-web.com wrote: I need to be better informed on naming conventions for modules. For instance, I need to create a new module and I want to make sure that the module name will not conflict with any future or current python system module names. There may be a PEP for this, if so, a URL to such a PEP would suffice for my inquiry. Also, if there is an index of PEPs, a link to such would also be appreciated. thanks -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: Calling C++ Modules in Python
Dan, Thanks for the info. Really I was hoping for a non-intrusive way to expose existing C++ libraries to python. However, both solutions (BOOST, SWIG) listed here require the recompilation of libraries?! Seems Cython is doing the similar way? It is ok for small applications but will be hard for big software from big companies. The reason is that even companies are willing to rebuild their own libraries with those wrappers or decorations added(though needs approves from all sorts of departments :)), they can't force their 3rd-party developers/users. Correct me if I am wrong. Rg, -Patrick On Mar 11, 2011 4:59pm, Dan Stromberg drsali...@gmail.com wrote: On Fri, Mar 11, 2011 at 1:15 PM, Patrick zxpat...@gmail.com wrote: Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). I guess it should be asked: easy for who? easy is always relative to some context. If you're planning to stay with CPython and C++ forevermore, then Cython is a nice way of gluing the two. Cython looks like Python code, but it gives you access to C and C++ code and data as well as CPython code and data. If you're planning to support your C++ code with more languages than CPython, you might be better off with SWIG. If you really do want to do the task the old way, you're probably best off copying some preexisting module with a maximize-the-developers-rights license (like Apache, MIT or 3 clause BSD), and modifying that. If you want to be able to move easily to pypy, I might suggest coming up with a C wrapper for your C++ code, and then accessing the C code using ctypes. That should work in CPython and pypy, and it looks like jython might support this soon as well. -- http://mail.python.org/mailman/listinfo/python-list
Inserting record into postgresql database
Hello all, I am using python 2.6 and the psycopg2 module for the postgres connection The following code is supposed to insert a record into a table with a bytea field. (bytearray) I am having difficulty getting to field inserted properly. The snippet below inserts the first 8 bit hex value, which is 0xA5, correctly I believe - as \245 Not sure why, but the rest of the 'string' is not inserted into the db table. Any ideas? commandString = re.escape(A500046898000AC73D228B0B018040003BF9) insert = INSERT INTO profile_commands(command_id, profile_id, execution_order, command, command_type) VALUES(%s, %s, 0, %s, 1); self.cur.execute(insert, (command_id, profileID,commandString,)) self.conn.commit() Thanks for any ideas you can give me Stacy -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: Calling C++ Modules in Python
I've not tried Boost, but I don't think SWIG or Cython require modified libraries. You just compile your wrapper, and then import it. On Fri, Mar 11, 2011 at 2:16 PM, zxpat...@gmail.com wrote: Dan, Thanks for the info. Really I was hoping for a non-intrusive way to expose existing C++ libraries to python. However, both solutions (BOOST, SWIG) listed here require the recompilation of libraries?! Seems Cython is doing the similar way? It is ok for small applications but will be hard for big software from big companies. The reason is that even companies are willing to rebuild their own libraries with those wrappers or decorations added(though needs approves from all sorts of departments :)), they can't force their 3rd-party developers/users. Correct me if I am wrong. Rg, -Patrick On Mar 11, 2011 4:59pm, Dan Stromberg drsali...@gmail.com wrote: On Fri, Mar 11, 2011 at 1:15 PM, Patrick zxpat...@gmail.com wrote: Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). I guess it should be asked: easy for who? easy is always relative to some context. If you're planning to stay with CPython and C++ forevermore, then Cython is a nice way of gluing the two. Cython looks like Python code, but it gives you access to C and C++ code and data as well as CPython code and data. If you're planning to support your C++ code with more languages than CPython, you might be better off with SWIG. If you really do want to do the task the old way, you're probably best off copying some preexisting module with a maximize-the-developers-rights license (like Apache, MIT or 3 clause BSD), and modifying that. If you want to be able to move easily to pypy, I might suggest coming up with a C wrapper for your C++ code, and then accessing the C code using ctypes. That should work in CPython and pypy, and it looks like jython might support this soon as well. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: PEP for module naming conventions
* David Marek dav...@atrey.karlin.mff.cuni.cz [110311 13:20]: Hi, Have you read PEP 8? http://python.org/dev/peps/pep-0008/ I don't think it's possible to be sure that the name of your module won't conflict with system module name (if you'll follow conventions). You can find the list of all PEPs at http://python.org/dev/peps/ Thank you for the links David. -- David Marek dav...@atrey.karlin.mff.cuni.cz http://davidmarek.cz And interesting web site. The future is with us. On Fri, Mar 11, 2011 at 10:52 PM, Tim Johnson t...@johnsons-web.com wrote: I need to be better informed on naming conventions for modules. For instance, I need to create a new module and I want to make sure that the module name will not conflict with any future or current python system module names. There may be a PEP for this, if so, a URL to such a PEP would suffice for my inquiry. Also, if there is an index of PEPs, a link to such would also be appreciated. thanks -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com -- http://mail.python.org/mailman/listinfo/python-list -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
From: OKB (not okblacke) brennospamb...@nobrenspambarn.net Robert wrote: Is there a push to one toolkit or the other? I use Dabo, which wraps wxPython. -- What's the advantage of using Dabo instead of wxPython directly? Thanks. Octavian -- http://mail.python.org/mailman/listinfo/python-list
How should I handle socket receiving?
I'm thinking to write a code which to: 1. establish tons of udp/tcp connections to a server 2. send packets from each connections 3. receive packets from each connections and then do something based on received content and connection statues. 4. repeat step 2 and step 3. my question is how should I handle receiving traffic from each connection respectively? two ways I'm thinking are: 1. setup connections one by one, put socket handler into an array(dictionary?), array also record each handler's status. then in a big loop, keep using select to check sockets, if any socket get something received, then find the socket in the array, based on the socket status to do things should be done. this one is like single- thread? 2. (I don't know if this one works, but I prefer this one if it do works. ) Setup connection object, write codes in the object to handle sending/receiving and status. let each object to check/receive its socket by itslef(I don't know how yet). Then In the main proc, I just initiate those objects. Any responses would be very welcome, thanks. -- http://mail.python.org/mailman/listinfo/python-list
OT: processes, terminals and file descriptors on *nix (was: Re: attach to process by pid?)
On 11.03.2011 03:18, Nobody wrote: On Thu, 10 Mar 2011 23:55:51 +0100, Alexander Kapps wrote: I think he wants to attach to another process's stdin/stdout and read/write from/to them. I don't know if this is possible but it would be a great addition for psutil. It's not even a meaningful concept, let alone possible. Unless I misunderstand something, You do ... Many thanks for the correction and lesson (to Grand Edwards too)! I still try to digest your explanations. I thought, that processes just do something like dup()'ing the file descriptors of their terminal but after some strace experiments, I think that is totally wrong. I'd like to learn more about this (how processes, their controlling terminals and the std file descriptors relate) Do you know any links to deeper material (tried Google but what I've found is to shallow) -- http://mail.python.org/mailman/listinfo/python-list
Re: How should I handle socket receiving?
On Fri, Mar 11, 2011 at 3:30 PM, Hans hans...@gmail.com wrote: I'm thinking to write a code which to: 1. establish tons of udp/tcp connections to a server 2. send packets from each connections 3. receive packets from each connections and then do something based on received content and connection statues. 4. repeat step 2 and step 3. my question is how should I handle receiving traffic from each connection respectively? two ways I'm thinking are: 1. setup connections one by one, put socket handler into an array(dictionary?), array also record each handler's status. then in a big loop, keep using select to check sockets, if any socket get something received, then find the socket in the array, based on the socket status to do things should be done. this one is like single- thread? This should work, except you perhaps don't need to keep the sockets in an array or find them in that array, because select is going to return a list of the ones that are ready for I/O. 2. (I don't know if this one works, but I prefer this one if it do works. ) Setup connection object, write codes in the object to handle sending/receiving and status. let each object to check/receive its socket by itslef(I don't know how yet). Then In the main proc, I just initiate those objects Each instance of your object(s) could select on just one socket. Start each object doing its thing in parallel. How you do that depends on what kind of concurrency you choose, but there tend to be lots of nice example programs that you can readily locate using google, showing how. CPython's threading is not strong (not sure how much it's improved in 3.2), so for concurrency, you'd probably best use the multiprocessing module or CPython 3.2's futures - or an alternative python implementation that threads well, like Jython. Oh, and you could try greenlets. In a way this is simpler than #1, in a way it's not. Supposedly tornado gets lots of great performance -because- it's single threaded. And it makes sense that this would be fast, up to a point, because you eliminate lots of context switching. However, on a system with lots of cores, and perhaps to future-proof your code (most likely individual cores aren't getting much faster anymore, but the number of cores is most likely going up), you're probably better off with something concurrent like your #2. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: processes, terminals and file descriptors on *nix (was: Re: attach to process by pid?)
On Fri, Mar 11, 2011 at 3:49 PM, Alexander Kapps alex.ka...@web.de wrote: On 11.03.2011 03:18, Nobody wrote: On Thu, 10 Mar 2011 23:55:51 +0100, Alexander Kapps wrote: I think he wants to attach to another process's stdin/stdout and read/write from/to them. I don't know if this is possible but it would be a great addition for psutil. It's not even a meaningful concept, let alone possible. Unless I misunderstand something, You do ... Many thanks for the correction and lesson (to Grand Edwards too)! I still try to digest your explanations. I thought, that processes just do something like dup()'ing the file descriptors of their terminal but after some strace experiments, I think that is totally wrong. Usually, file descriptors are inherited across fork() (and maybe Windows' startprocess), as is the contents of any buffers corresponding to them - so when flushing you can get two copies of the same output, or two copies of the same input. There's no need to dup to just inherit a filedescriptor from a parent process to a child. I'd like to learn more about this (how processes, their controlling terminals and the std file descriptors relate) I'm not sure controlling terminals are that relevant. The standard filedescriptors are just 0, 1, and 2 for stdin, stdout and stderr. They're pretty much like any other filedescriptors, except they tend to be open already when a program starts. Oh, and the buffering might be different from one filedes to another, of course. Do you know any links to deeper material (tried Google but what I've found is to shallow) Check this out; you can pass a filedescriptor through a unix domain socket, though I've never tried it myself in C, let alone Python: http://stackoverflow.com/questions/909064/portable-way-to-pass-file-descriptor-between-different-processes -- http://mail.python.org/mailman/listinfo/python-list
Re: Inserting record into postgresql database
On 11/03/2011 22:08, Meszaros, Stacy wrote: Hello all, I am using python 2.6 and the psycopg2 module for the postgres connection The following code is supposed to insert a record into a table with a bytea field. (bytearray) I am having difficulty getting to field inserted properly. The snippet below inserts the first 8 bit hex value, which is 0xA5, correctly I believe - as \245 Not sure why, but the rest of the 'string' is not inserted into the db table. Any ideas? commandString = re.escape(A500046898000AC73D228B0B018040003BF9) insert = INSERT INTO profile_commands(command_id, profile_id, execution_order, command, command_type) VALUES(%s, %s, 0, %s, 1); self.cur.execute(insert, (command_id, profileID,commandString,)) self.conn.commit() Thanks for any ideas you can give me Stacy Does this help? http://stackoverflow.com/questions/3103242/inserting-text-string-with-hex-into-postgresql-as-a-bytea -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
On Fri, 11 Mar 2011 19:32:53 +, Grant Edwards wrote: On 2011-03-11, Martin Gregorie martin@address-in-sig.invalid wrote: BTW, there was no such thing as a VT-200 - there was a VT-220 text terminal (which I think the OP was remembering) and the VT-240 and 241 terminals, which were totally different graphics terminals that accepted Tektronics graphics commands: comparing a VT-220 to a VT-240/241 would be like comparing an Epson dot-matric printer to an HP 7485 plotter! The 220 and 240/241 weren't fundamentally different display technologies they way a dot-matrix differs from a pen-plotter. Both were raster-scan CRT tubes (AFAICT, they used identical CRT tubes and driver hardwar). When used in text mode, the 240 wasn't really any different than the 220. But, the 240 also supported a graphics mode that allowed apps to draw using vector commands). I remember writing an app using the ReGIS command set to draw a clock with a moving second hand on a 240. Comparing a vt220 to a vt240 is like comparing a black-and-white epson 9-pin dot-matrix printer that can't do graphics with a balck-and-white epson 9-pin dot-matrix printer than can do graphics. Sorry if I wasn't clear: I was intending to compare APIs rather than the display mechanisms - I am aware that both text terminals and vector graphics terminals are raster devices, not vector like oscilloscopes. What I was getting at is that the API used to cause graphics or text to be output on a dot-matrix printer is totally unlike that used to draw to same representations on a pen plotter. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | -- http://mail.python.org/mailman/listinfo/python-list
Re: enhanced map function
On Fri, 11 Mar 2011 13:00:23 -0800, Patrick wrote: Hi, The build-in map functions looks quite nice but it requests the iterables to be of the same length or otherwises will file with None (most of time fails the function). Just wondering if there are already enhancement work done with it? That has been fixed in Python 3.1: from operator import add list(map(add, [1,2,3], [1,2,3,4,5])) [2, 4, 6] Starting from Python 2.3, the itertools module has had a function imap with the same behaviour: from operator import add list(itertools.imap(add, [1,2,3], [1,2,3,4,5])) [2, 4, 6] I did some simple code but it will handle list without nesting only. Surely that is a good thing. If you have a mix of nested and non-nested data, that tells me your data is badly organized and needs to be fixed. I am looking for examples that could hand input of a = [2,3], b=4 Using a small helper function: import itertools def make_iterable(obj): try: iter(obj) except TypeError: obj = itertools.cycle([obj]) return obj def enhanced_map(func, *args): args = map(make_iterable, args) return list(itertools.imap(func, *args)) WARNING: this is dangerous. If none of the arguments are iterable, e.g. you call enhanced_map(operator.add, 2, 3), this will happily loop forever building a larger and larger list, until you run out of memory or kill the Python process. and a=[1,[2,3],4], b=[5,[6,7,8],9,10]. That means if the nesting structure is the same, enhanced map function will automatically extend the shorter list using the last element. It isn't clear what you want here. Are you expecting this enhanced map to recursively drop down into each layer of sub-sequences? That is: enhanced_map([1, [2,3, [4,5], 6], 7], [8, [7,6, [5,4], 3], 2]) should be the same as map([1, 2, 3, 4, 5, 6, 7], [8, 7, 6, 5, 4, 3, 2]) or something different? What do you expect to happen if the sub-sequences don't match up exactly? E.g. a = [1, 2, [3, 4]]; b = [1, [2, 3], 4] What do you expect to happen if the shorter list is empty? E.g. a = [1, 2, [3, 4], 5]; b = [1, 2, [], 3] This will get really messy fast. My advice is to forget about this as a bad idea, and instead concentrate on making sure your data isn't so badly arranged in the first place. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: my computer is allergic to pickles
Peter Otten __pete...@web.de wrote: Bob Fnord wrote: I started by using cPickle to save the instance of the class that contained this dict, but the pickling process started to write the file but ate so much memory that my computer (4 GB RAM) crashed so badly that I had to press the reset button. I've never seen out-of-memory errors do this before. Is this normal? snipped myself Any comments, suggestions? Have you seen that one? http://mail.python.org/pipermail/python-list/2008-July/1139855.html Not until now, but that's interesting. But I didn't even get a backtrace, just a totally locked up computer! -- http://mail.python.org/mailman/listinfo/python-list
Re: my computer is allergic to pickles
Miki Tebeka miki.teb...@gmail.com wrote: From looking at the shelve info in the library reference, I get the impression it's tricky to change the values in the dict for existing keys and be sure they get changed on disk. You can use writeback=True or call sync at the right places. How can you convert a tuple of strings to a string and back in a reliable deterministic way? The original strings may have ' , in them. You can use marshal, json or any other serializing library. Thanks for the tips. I guess I'll use json if I ever need to be able to read the file with something else besides python, but marshal seems fine for now. -- http://mail.python.org/mailman/listinfo/python-list
Re: How should I handle socket receiving?
I'm abs not sure but maybe you'll need to put each client into separate thread; like this def Client_func(s2, cn): while 1: data = cn.recv(4096) if not data: s2.shutdown(1) return s2.sendall(data) cn, addr = s1.accept() s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s2.connect((the_server_host, the_server_port)) thread.start_new_thread(Client_func, (s2, cn,)) -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
Octavian Rasnita wrote: From: OKB (not okblacke) brennospamb...@nobrenspambarn.net Robert wrote: Is there a push to one toolkit or the other? I use Dabo, which wraps wxPython. -- What's the advantage of using Dabo instead of wxPython directly? Dabo gives you a much more intuitive and Pythonic API. There's also a GUI designer for building apps graphically, although I haven't really used that. -- --OKB (not okblacke) Brendan Barnwell Do not follow where the path may lead. Go, instead, where there is no path, and leave a trail. --author unknown -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you use with Python for GUI programming and why?
On 2011-03-11 01:14:01 -0500, Dan Stromberg said: You're probably best off with Pyjamas. Then you get something that runs on the web and on the desktop, from the same code - similar to GWT, but for Python. The desktop version runs overtop of CPython, the web version is AJAX and is automatically translated from a very 2.x-ish dialect of Python to Javascript. Programming an AJAX app this way feels just like programming to a set of desktop widgets - because they are also desktop widgets. But what OSes are you using? On Thu, Mar 10, 2011 at 6:25 PM, Robert sigz...@gmail.com wrote: Is there a push to one toolkit or the other? I am mostly on OSX...but I would target at least the big three (Windows, Linux, OSX). -- Robert -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling C++ Modules in Python
On 3/11/2011 4:15 PM, Patrick wrote: Hi, I saw in the Beginner document that •Is easily extended by adding new modules implemented in a compiled language such as C or C++. . While to my investigation, it seems not that easy or did I miss something? boost python (C++ libraries need to be re-compiled with written wrappers again?). SWIG (It works by taking the declarations found in C/C++ header and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code). cytpes does not require recompilation. Not as fast either. But good enough for many purposes. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Purely historic question: VT200 text graphic programming
Anssi Saari a...@sci.fi wrote in news:vg3hbba6mp7@pepper.modeemi.fi: Grant Edwards invalid@invalid.invalid writes: C wasn't very widely used under VMS, and VMS had it's own screen formatting and form handling libraries. Just curious, what language was widely used in VMS? My VMS experience is limited to running Maple for a math course in the university in early 1990s. Didn't know how to do much more than start Maple, probably just dir, logout (or was it logoff?) and ftp :) Did you say was? The last time I did any programming on a VMS system was ... about 5 1/2 hours ago. Our shop runs OpenVMS now, programs mostly in C and BASIC. I've quietly insinuated Python into the mix over the last few months, and that has helped my sanity considerably. I did use the curses library with Vax C years ago, though online data entry programs used the SMG library. -- rzed -- http://mail.python.org/mailman/listinfo/python-list
organizing many python scripts, in a large corporate environment.
We've been doing a fair amount of Python scripting, and now we have a directory with almost a hundred loosely related scripts. It's obviously time to organize this, but there's a problem. These scripts import freely from each other and although code reuse is generally a good thing it makes it quite complicated to organize them into directories. There's a few things that you should know about our corporate environment: 1) I don't have access to the users' environment. Editing the PYTHONPATH is out, unless it happens in the script itself. 2) Users don't install things. Systems are expected to be *already* installed and working, so setup.py is not a solution. I'm quite willing to edit my import statements and do some minor refactoring, but the solutions I see currently require me to divide all the code strictly between user runnable scripts and libraries, which isn't feasible, considering the amount of code. Has anyone out there solved a similar problem? Are you happy with it? --Buck -- http://mail.python.org/mailman/listinfo/python-list
organizing many python scripts, in a large corporate environment.
We've been doing a fair amount of Python scripting, and now we have a directory with almost a hundred loosely related scripts. It's obviously time to organize this, but there's a problem. These scripts import freely from each other and although code reuse is generally a good thing it makes it quite complicated to organize them into directories. There's a few things that you should know about our corporate environment: 1) I don't have access to the users' environment. Editing the PYTHONPATH is out, unless it happens in the script itself. 2) Users don't install things. Systems are expected to be *already* installed and working, so setup.py is not a solution. I'm quite willing to edit my import statements and do some minor refactoring, but the solutions I see currently require me to divide all the code strictly between user runnable scripts and libraries, which isn't feasible, considering the amount of code. Has anyone out there solved a similar problem? Are you happy with it? --Buck -- http://mail.python.org/mailman/listinfo/python-list
Re: attach to process by pid?
On 3/9/2011 5:38 PM, Miki Tebeka wrote: Is there any way to attach to an already running process by pid? I want to send commands from python to an application that is already running. I don't want to give the command name to subprocess.Popen. We probably need more information. What do you mean by send commands? (What was your work flow if you could give the command name to Popen?) There are ways under Windows to attach to a running process and do things to it. Look up CreateRemoteThread. There's a way to do this under Linux, too. See http://www.codeproject.com/KB/DLL/code_injection.aspx;. It is very unlikely that a Python programmer would use either of these. The original poster needs to express more clearly what they really want to do. I suspect they want to create a server that client programs can talk to. There are good ways to do that, both on the same machine and across a network. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: organizing many python scripts, in a large corporate environment.
I'm not an expert at Python packaging, but assuming a structure such as folder1 \ __init__.py module1.py folder2 \ __init__.py module2.py Then from the root folder I can run python -m folder1.module1 and within module1, I can import from module2, e.g.: from folder2.module2 import foo The __init__.py files are empty. They make Python treat the folder as a package namespace from which you can import, or execute a module directly with the -m option. -- EOF -- http://mail.python.org/mailman/listinfo/python-list
Re: Compile time evaluation of dictionaries
On Thu, 10 Mar 2011 11:23:32 -0500, Gerald Britton wrote:
Today I noticed that an expression like this:
one:%(one)s two:%(two)s % {one: is the loneliest number, two:
can be as bad as one}
could be evaluated at compile time, but is not:
[...]
Any idea why Python works this way? I see that, in 3.2, an optimization
was done for sets (See Optimizations at
http://docs.python.org/py3k/whatsnew/3.2.html) though I do not see
anything similar for dictionaries.
Python is a language, what you are looking at is an implementation of
that language. Although I have never used it myself, apparently Cesare Di
Mauro's WPython does more constant folding optimizations than CPython.
See pages 21-24 of
http://wpython2.googlecode.com/files/Beyond%20Bytecode%20-%20A%20Wordcode-based%20Python.pdf
--
Steven
--
http://mail.python.org/mailman/listinfo/python-list
[issue11244] Negative tuple elements produce inefficient code.
Mark Dickinson dicki...@gmail.com added the comment: fold-0.patch looks good to me, but why do you include tests only for the float case (-0.0) and not the integer case (-0)? Style nitpick: def negzero(): return -(1.0-1.0) should be on two source lines, not one. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11244 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
