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Weirdness with python and stdin redirection under Win32
by Jonathan M. Gilligan Jan. 18, 2013

Jan. 18, 2013

I am getting an error reading stdin only when I invoke a python script by typing "bar | foo.py" or "foo.py < bar", but not when typing "bar | python foo.py" or "python foo.py < bar". The error arises ecause when input is redirected, stdin has fileno = -1 if the script is invoked as "foo.py", but correctly has fileno = 0 if it is invoked as "python foo.py" Consider the following script, which I want to use as a prototype for a simple stdin --> stdout filter: # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) On win32 (Win2k pro, SP3), using ActiveState ActivePython 2.2.1 build 222, I can execute foo.py either by typing "foo.py" or "python foo.py" on the command line (the relevant registry key for opening .py files has command 'C:\Python22\python.exe "%1" %*'). If I type "echo bar | foo.py", I get C:\>echo bar | foo.py The process tried to write to a nonexistent pipe. fileno = -1 Traceback (most recent call last): File "C:\foo.py", line 7, in ? lines = sys.stdin.readlines() IOError: [Errno 9] Bad file descriptor whereas if I type "echo bar | python foo.py", I get C:\>echo bar | python foo.py fileno = 0 bar Other tests yield: C:\>foo.py < foo.py fileno = -1 Traceback (most recent call last): File "C:\Documents and Settings\Jonathan\My Documents\Programming\Omap VU\Fast CameraDriver\BF_LabView\Leo\foo.py", line 7, in ? for line in lines: IOError: [Errno 9] Bad file descriptor C:\>python foo.py < foo.py fileno = 0 # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) If I just type "foo.py" or "python foo.py" on the command line, I get "fileno = 0" in both cases and the script works identically in both cases. Can anyone explain what's happening? Why the file descriptor for redirected stdin has a fileno of -1 if the python script is invoked using "foo.py" but not when it's invoked with "python foo.py"? Thanks, Jonathan

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by babacity4＠gmail.com Dec. 14, 2012

Dec. 14, 2012

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PHP vs. Python
by stephen.mayer＠gmail.com Sept. 25, 2012

Sept. 25, 2012

Anyone know which is faster? I'm a PHP programmer but considering getting into Python ... did searches on Google but didn't turn much up on this. Thanks! Stephen

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Re: Storing of folder structure in SQL DB
by Sergei Minayev Sept. 21, 2012

Sept. 21, 2012

Amit Khemka: > On 5 Apr 2007 04:58:22 -0700, Sergei Minayev <sergei.minayev(a)gmail.com> wrote: > > Hi All! > > Can you please help me with the following problem: > > I need to store a copy of local folders structure in MySQL database. > > I have chosen the following table structure for that: > > ------------------------------------------------ > > | id | id_uplink | folder_name | > > ------------------------------------------------ > > id - unique property of each folder. > > id_uplink - id of upper level folder is stored here (for example: if > > id of c:\test is 1, than id_uplink of c:\test\python equals 1). > > folder_name - name of folder. > > You see, i dont want to store the path list, but the structure. > > > > The question is how to implement that in Python. I easily made it in C+ > > + using recursion. But, unfortunately, I can't figure it out how to > > make it in python using os.walk function (or can you recommend smth. > > else???). :( Though it looks quite simple, but anyway. > > > > Best Regards, > > os.walk should be more than sufficient in your case. You can navigate > the directory structure and at each 'new' directory find its parents > id and assign a new-id to this 'new' directory. > > An Example: > > import os > root='/my/root/directory' > id =0 > tree={root:(-1, id)} > id+=1 > for path, dirs, files in os.walk(root): > for dir in dirs: > if not tree.has_key(path+'/'+dir): > tree[path+'/'+dir]=(tree[path][1], id) > id+=1 > > It stores ids as a tuple (parent_id, id) in a dictionary(tree). Should > be straight forward to modify to your requirements. Also you can make > the following code more efficient by saving/caching some lookups ! > > Cheers, > -- > ---- > Amit Khemka -- onyomo.com > Home Page: www.cse.iitd.ernet.in/~csd00377 > Endless the world's turn, endless the sun's Spinning, Endless the quest; > I turn again, back to my own beginning, And here, find rest. Thanks! Your code example was really helpful!

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jython lacks working xml processing modules?
by janeaustine50＠hotmail.com July 17, 2012

July 17, 2012

I'm trying to parse an xml file with jython (not through java parsers like xerces). I tried minidom in jython 2.1 and 2.2a but all failed. What can I do? The last resort would be using java parsers. Then how can I use them like python xml parsers? It seems like javadom and javasax has something to do, but I don't know how. Jane

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PyXML 0.8.2 is released
by martin＠v.loewis.de July 17, 2012

July 17, 2012

Version 0.8.2 of the Python/XML distribution is now available. It should be considered a beta release, and can be downloaded from the following URLs: http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2.tar.gz http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2.win32-py2.2.exe http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2-2.2.Suse81.i386.rpm Changes in this version, compared to 0.8.1: * Updated to Expat 1.95.6. * Support more DOM L3 features in minidom: isWhitespaceInElementContent, schemaType, isId, DOMImplementationSource * Various bug fixes, including - 609641: minidom nodes not pickleable - 618156: Use character references in XMLGenerator if necessary - 622286: marshal.wddx: 'recordset' element typo - 624420: Can't create 2nd Sax2.Reader - 665486: Implement SAX skippedEntity for Expat The Python/XML distribution contains the basic tools required for processing XML data using the Python programming language, assembled into one easy-to-install package. The distribution includes parsers and standard interfaces such as SAX and DOM, along with various other useful modules. The package currently contains: * XML parsers: Pyexpat (Jack Jansen), xmlproc (Lars Marius Garshol), sgmlop (Fredrik Lundh). * SAX interface (Lars Marius Garshol) * minidom DOM implementation (Paul Prescod, others) * 4DOM and 4XPath from Fourthought (Uche Ogbuji, Mike Olson) * Schema implementations: TREX (James Tauber) * Various utility modules and functions (various people) * Documentation and example programs (various people) The code is being developed bazaar-style by contributors from the Python XML Special Interest Group, so please send comments and questions to <xml-sig(a)python.org>. Bug reports may be filed on SourceForge: http://sourceforge.net/tracker/index.php?group_id=6473&atid=106473 For more information about Python and XML, see: http://www.python.org/topics/xml/ -- Martin v. Löwis http://www.informatik.hu-berlin.de/~loewis

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Keeping the Console Open with IDLE
by W. eWatson July 15, 2012

July 15, 2012

I'm using IDLE for editing, but execute programs directly. If there are execution or "compile" errors, the console closes before I can see what it contains. How do I prevent that? -- W. eWatson (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet Web Page: <www.speckledwithstars.net/>

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Create thumbnail image (jpg/png) of PDF file using Python
by sophie_newbie June 14, 2012

June 14, 2012

Is there any way to do this directly within python? If not is there any other good way to achieve it? Thanks in advance for any help!

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Mouse LED Control in Python
by semagraw＠gmail.com May 28, 2012

May 28, 2012

I found this link that describes the byte arrays to control the IM/Email Leds on my Logitech MX610 mouse: http://www.kdedevelopers.org/node/2029 The link to the tarball is dead so I can't look at that. Is there anyway to do what the link says in Python? If you follow the link above, it talks about 'sending the byte array to 0x10 (16)'. I'm not sure if that is possible in python. Can anyone help or point me in the right direction? I'd also be willing to have this be done in another language and just call different programs from a python program when I need something specific done (IM light on, for example). Text from the link if you can't be bothered to follow it: "I've figured out the IM led now. As before, you send 6 bytes to report ID 0x10 (16), followed by the "confirm" message. The magic values are: unsigned char confirm[6] = { 0x01, 0x80, 0x52, 0x00, 0x00, 0x00 }; unsigned char email_off[6] = { 0x01, 0x80, 0x52, 0x06, 0x00, 0x00 }; unsigned char email_on[6] = { 0x01, 0x80, 0x52, 0x05, 0x00, 0x00 }; unsigned char email_pulse[6] = { 0x01, 0x80, 0x52, 0x04, 0x00, 0x00 }; unsigned char email_flash[6] = { 0x01, 0x80, 0x52, 0x03, 0x00, 0x00 }; unsigned char email_instanton[6] = { 0x01, 0x80, 0x52, 0x02, 0x00, 0x00 }; unsigned char email_instantoff[6] = { 0x01, 0x80, 0x52, 0x01, 0x00, 0x00 }; unsigned char im_off[6] = { 0x01, 0x80, 0x52, 0x00, 0x06, 0x00 }; unsigned char im_on[6] = { 0x01, 0x80, 0x52, 0x00, 0x05, 0x00 }; unsigned char im_pulse[6] = { 0x01, 0x80, 0x52, 0x00, 0x04, 0x00 }; unsigned char im_flash[6] = { 0x01, 0x80, 0x52, 0x00, 0x03, 0x00 }; unsigned char im_instantoff[6] = { 0x01, 0x80, 0x52, 0x00, 0x01, 0x00 }; unsigned char im_instanton[6] = { 0x01, 0x80, 0x52, 0x00, 0x02, 0x00 };" Thanks, Jeff

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Pydev configuration
by Sébastien Boisgérault May 10, 2012

May 10, 2012

Hi, Did anyone managed to change the code font family/size in Pydev (Python Editor Plugin for Eclipse) ? I found how to change the color mapping (Windows/Preference/Pydev) but did not found the font setting. Cheers, SB

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