🌐 Mailman 3 March 2005 - Python-list - python.org

Recording Video with Python
by googlemike＠hotpop.com March 31, 2005

March 31, 2005

Is there a video module so that I can write a Linux Python script to record video coming over USB video cams? What about these side-thoughts: * What about recording multiple streams over multiple USB ports? (Think in the context of a security system.) * What about lossy compression? * What about recording only time slices? * How would you provide real-time video to a security guard, but then only write time-sliced, lossy compression to disk, saving disk space yet providing something very suitable for a security guard to watch live?

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(no subject)
by None March 31, 2005

March 31, 2005

#! rnews 1066 Newsgroups: comp.lang.python Path: news.xs4all.nl!newsspool.news.xs4all.nl!transit.news.xs4all.nl!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!nntp.abs.net!attws2!ip.att.net!NetNews1!xyzzy!nntp From: Harry George <harry.g.george(a)boeing.com> Subject: Re: hex string into binary format? X-Nntp-Posting-Host: cola2.ca.boeing.com Content-Type: text/plain; charset=us-ascii Message-ID: <xqxsm2b981w.fsf(a)cola2.ca.boeing.com> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 Lines: 28 Sender: hgg9140(a)cola2.ca.boeing.com Organization: The Boeing Company References: <mailman.1136.1112277359.1799.python-list(a)python.org> Mime-Version: 1.0 Date: Thu, 31 Mar 2005 14:58:03 GMT Xref: news.xs4all.nl comp.lang.python:370100 "Tertius Cronje" <Tertius.Cronje(a)postoffice.co.za> writes: > Hi, > > How do I get a hexvalued string to a format recognized for binary > calculation? > > > import binascii > s1 = '1C46BE3D9F6AA820' > s2 = '8667B5236D89CD46' > > i1 = binascii.unhexlify(s1) > i2 = binascii.unhexlify(s2) > x = i1 ^i2 > > TypeError: unsupported operand type(s) for ^: 'str' and 'str' > > Many TIA > T i1=int(s1,16) i2=int(s2,16) -- harry.g.george(a)boeing.com 6-6M21 BCA CompArch Design Engineering Phone: (425) 294-4718

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(no subject)
by None March 31, 2005

March 31, 2005

#! rnews 1066 Newsgroups: comp.lang.python Path: news.xs4all.nl!newsspool.news.xs4all.nl!transit.news.xs4all.nl!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!nntp.abs.net!attws2!ip.att.net!NetNews1!xyzzy!nntp From: Harry George <harry.g.george(a)boeing.com> Subject: Re: hex string into binary format? X-Nntp-Posting-Host: cola2.ca.boeing.com Content-Type: text/plain; charset=us-ascii Message-ID: <xqxsm2b981w.fsf(a)cola2.ca.boeing.com> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 Lines: 28 Sender: hgg9140(a)cola2.ca.boeing.com Organization: The Boeing Company References: <mailman.1136.1112277359.1799.python-list(a)python.org> Mime-Version: 1.0 Date: Thu, 31 Mar 2005 14:58:03 GMT Xref: news.xs4all.nl comp.lang.python:370100 "Tertius Cronje" <Tertius.Cronje(a)postoffice.co.za> writes: > Hi, > > How do I get a hexvalued string to a format recognized for binary > calculation? > > > import binascii > s1 = '1C46BE3D9F6AA820' > s2 = '8667B5236D89CD46' > > i1 = binascii.unhexlify(s1) > i2 = binascii.unhexlify(s2) > x = i1 ^i2 > > TypeError: unsupported operand type(s) for ^: 'str' and 'str' > > Many TIA > T i1=int(s1,16) i2=int(s2,16) -- harry.g.george(a)boeing.com 6-6M21 BCA CompArch Design Engineering Phone: (425) 294-4718

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Re: How To Do It Faster?!?
by Max Erickson March 31, 2005

March 31, 2005

I don't quite understand what your program is doing. The user=a[18::20] looks really fragile/specific to a directory to me. Try something like this: >>> a=os.popen("dir /s /q /-c /a-d " + root).read().splitlines() Should give you the dir output split into lines, for every file below root(notice that I added '/s' to the dir command). There will be some extra lines in a that aren't about specific files... >>> a[0] ' Volume in drive C has no label.' but the files should be there. >>> len(a) 232 To get a list containing files owned by a specific user, do something like: >>> files=[line.split()[-1] for line in a if owner in line] >>> len(files) 118 This is throwing away directory information, but using os.walk() instead of the /s switch to dir should work, if you need it... max

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Re: How To Do It Faster?!?
by Aquila Deus March 31, 2005

March 31, 2005

andrea.gavana(a)agip.it wrote: > Hello NG, > > in my application, I use os.walk() to walk on a BIG directory. I need > to retrieve the files, in each sub-directory, that are owned by a > particular user. Noting that I am on Windows (2000 or XP), this is what I > do: > > for root, dirs, files in os.walk(MyBIGDirectory): > > a = os.popen("dir /q /-c /a-d " + root).read().split() > > # Retrieve all files owners > user = a[18::20] > > # Retrieve all the last modification dates & hours > date = a[15::20] > hours = a[16::20] > > # Retrieve all the filenames > name = a[19::20] > > # Retrieve all the files sizes > size = a[17::20] > > # Loop throu all files owners to see if they belong > # to that particular owner (a string) > for util in user: > if util.find(owner) >= 0: > DO SOME PROCESSING > > Does anyone know if there is a faster way to do this job? You may use "dir /s", which lists everything recursively.

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Re: Rif: Re: How To Do It Faster?!?
by Diez B. Roggisch March 31, 2005

March 31, 2005

andrea.gavana(a)agip.it wrote: > Am I missing something on the stat module? I'm running Python 2.3.4. > Yes, you are missing that this is more unix-like. It seems to work in a certain degree on windows - but as the user-model between unix and windows is considerably different, you found a not-so-well working part. I don't think that your code could be much faster at all - the limits are not so much within python than windows itself. The only thing I can think of is to use python-win32 to make the calls that dir with your various options does itself. That would maybe save you the additional overhead of creating a string representation (done by dir) and parsing that - but I doubt the performance gain justifies the means. -- Regards, Diez B. Roggisch

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Re: property and virtuality
by Diez B. Roggisch March 31, 2005

March 31, 2005

> Great. I'll think about this and decide which is better - lamba or > private functions. Lambda seems much > shorter but it is not as clear why it is there. :-) I did put comments above each property line - so one might argue that's about the same effort as writing the method explicit. Alternatively, you could introduce a naming scheme in the getters/setters that are supposed to be overloaded so that it becomes clear - at least for someone knowing the project. But that's true for the whole thingy :) > Yes, I feel the same. Using a metaclass could be a small help but rather > elaborate and probably much slower. Certainly not much slower - that happens once, at class creation time - and the results would even be faster, as you can skip the layer of indirection. -- Regards, Diez B. Roggisch

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RE: Generating RTF with Python
by Tertius Cronje March 31, 2005

March 31, 2005

I'll use http://www.tug.org/ or a smaller solution http://lout.sourceforge.net/ together with one of many Python template solutions to generate to generate reports. HTH T > -----Original Message----- > From: python-list-bounces+tertius.cronje=postoffice.co.za(a)python.org > [mailto:python-list-bounces+tertius.cronje=postoffice.co.za@python.org] On > Behalf Of Andreas Jung > Sent: Thursday, March 31, 2005 4:02 PM > To: python-list(a)python.org > Subject: Generating RTF with Python > > Hi, > > does anyone know of a high-level solution to produce RTF from Python > (something similar to > Reportlab for producing PDF)? > > Thanks, > Andreas

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hex string into binary format?
by Tertius Cronje March 31, 2005

March 31, 2005

Hi, How do I get a hexvalued string to a format recognized for binary calculation? import binascii s1 = '1C46BE3D9F6AA820' s2 = '8667B5236D89CD46' i1 = binascii.unhexlify(s1) i2 = binascii.unhexlify(s2) x = i1 ^i2 TypeError: unsupported operand type(s) for ^: 'str' and 'str' Many TIA T

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Generating RTF with Python
by Andreas Jung March 31, 2005

March 31, 2005

Hi, does anyone know of a high-level solution to produce RTF from Python (something similar to Reportlab for producing PDF)? Thanks, Andreas

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