🌐 Mailman 3 July 1999 - Tutor - python.org

Accessing C library (".a") functions from Python?
by sessile＠in-gen.net Aug. 10, 1999

Aug. 10, 1999

My relevent programming experience: some Python, negligible C/C++. I have a library file named "libtts.a" containing a bunch of functions that I would like to make accessible through Python. I know that a C program can access the functions by name (eg., "tts_get_int") if I compile the program with a link to the library (and obey the function's requirements as spelled out in the "tts" documentation). I have read the Extending and Embedding Tutorial, but still don't see how to get started. I take it that I'm missing some basic concepts here... what information can I provide to make advising me easier (or at least possible)? -- E-Mail: sessile(a)in-gen.net "I don't want the world... I just want your half." -- TMBG (Anna Ng)

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Re: [Tutor] Getting current path
by Chris Frost Aug. 1, 1999

Aug. 1, 1999

On Mon, Jul 26, 1999 at 08:01:30AM -0700, Emile van Sebille wrote: > Hi Chris, > > >>> import os > >>> os.getcwd() > 'D:\\Program Files\\Python\\Tools\\idle' > > HTH Yes, thanks! How could I tell if the user simply entered a filename, or if they gave the entire path (assuming unix if that helps)? thanks again, -- Chris Frost | <http://www.frostnet.advicom.net/chris/> -------------+------------------------------------------ Public PGP Key: Email chris(a)frostnet.advicom.net with the subject "retrieve pgp key" or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml>

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A beginner's question
by martin martin Aug. 1, 1999

Aug. 1, 1999

To dear --- : Can I know what should I know before I learn how to program .As you know , i'm a real real beginner .Or should I start with basic understanding .For example : if I want to create a program that could make the monitor screen upside-down or something else ,what should i start from the beginning ?....Thank you for answering my question...... _____________________________________________________________ Do You Yahoo!? Free instant messaging and more at http://messenger.yahoo.com

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RE: [Tutor] popen()ed file object hangs on close() -- why?
by Doug Stanfield July 28, 1999

July 28, 1999

I don't know what platform you're on but I'd do something like (untested code): class PingPipe(CommandPipe): def __init__(self, command=ping, command_options='-c 1', command_args=host, regexp=ping_re): CommandPipe.__init__(self, command, command_options, command_args, regexp) Notice the command_options='-c 1'. This limits you to one ping and if thats not what you're trying to do, adjust the number. Apologies in advance for the probable line length mangling of my mailer. -Doug- > -----Original Message----- > From: Evgeny Roubinchtein [mailto:eroubinc@u.washington.edu] > Sent: Wednesday, July 28, 1999 5:34 PM > To: tutor(a)python.org > Subject: [Tutor] popen()ed file object hangs on close() -- why? > > > So, I have written a very simple script to filter the output > of a command. > Right now it is just the ping command, but I think I can add more. The > problem is the script hangs. I realize that the ping command is > still writing data when I try to close the pipe. If I knew > it's PID, I > could try killing it, but I how do I get its PID? (short of an > equivalent of 'ps ax | grep ping' ) Here is the script: > It hangs under both Linux and FreeBSD, in case that matters. > > I know I am doing sthg stupid, I just wish I knew what... > > Any help is greatly appreciated > > ---%<----- > > #! /usr/local/bin/python > > import re, os, string, sys > > ping = '/bin/ping' > host = '127.0.0.1' > ping_re = r'\s+time=(?P<numbers>\d+\.\d*)\s+ms' > > class CommandPipe: > def __init__(self, command, command_options, > command_args, regexp): > self.prog = string.join((command, command_options, > command_args), ' ') > self.re_obj = re.compile(regexp) > self.line = '' > def run(self): > command_pipe = os.popen(self.prog) > maxcount = 5 # this can be adjusted > for i in range(maxcount): > line = command_pipe.readline() > if not line: > break > line = string.strip(line) > m = self.re_obj.search(line) > if m: > for group in m.groups(): > print group, > print # a blank line > sys.stdout.flush() > command_pipe.close() # the script hangs here > return > > > > class PingPipe(CommandPipe): > def __init__(self, command=ping, command_options='', > command_args=host, > regexp=ping_re): > CommandPipe.__init__(self, command, command_options, > command_args, > regexp) > > def test(): > p = PingPipe() > p.run() > > > if __name__=='__main__': > test() > sys.exit(0) > > > > -- > Evgeny Roubinchtein, eroubinc(a)u.washington.edu > ................... > SDD: Scratch Disk and Die > > > _______________________________________________ > Tutor maillist - Tutor(a)python.org > http://www.python.org/mailman/listinfo/tutor >

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popen()ed file object hangs on close() -- why?
by Evgeny Roubinchtein July 28, 1999

July 28, 1999

So, I have written a very simple script to filter the output of a command. Right now it is just the ping command, but I think I can add more. The problem is the script hangs. I realize that the ping command is still writing data when I try to close the pipe. If I knew it's PID, I could try killing it, but I how do I get its PID? (short of an equivalent of 'ps ax | grep ping' ) Here is the script: It hangs under both Linux and FreeBSD, in case that matters. I know I am doing sthg stupid, I just wish I knew what... Any help is greatly appreciated ---%<----- #! /usr/local/bin/python import re, os, string, sys ping = '/bin/ping' host = '127.0.0.1' ping_re = r'\s+time=(?P<numbers>\d+\.\d*)\s+ms' class CommandPipe: def __init__(self, command, command_options, command_args, regexp): self.prog = string.join((command, command_options, command_args), ' ') self.re_obj = re.compile(regexp) self.line = '' def run(self): command_pipe = os.popen(self.prog) maxcount = 5 # this can be adjusted for i in range(maxcount): line = command_pipe.readline() if not line: break line = string.strip(line) m = self.re_obj.search(line) if m: for group in m.groups(): print group, print # a blank line sys.stdout.flush() command_pipe.close() # the script hangs here return class PingPipe(CommandPipe): def __init__(self, command=ping, command_options='', command_args=host, regexp=ping_re): CommandPipe.__init__(self, command, command_options, command_args, regexp) def test(): p = PingPipe() p.run() if __name__=='__main__': test() sys.exit(0) -- Evgeny Roubinchtein, eroubinc(a)u.washington.edu ................... SDD: Scratch Disk and Die

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(no subject)
by Garyf618＠cs.com July 28, 1999

July 28, 1999

who do u make games using python?

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Re: Tutor digest, Vol 1 #87 - 7 msgs
by Daniel Gau July 27, 1999

July 27, 1999

On Tue, 27 Jul 1999 tutor-admin(a)python.org wrote: > > Send Tutor mailing list submissions to > tutor(a)python.org > > To subscribe or unsubscribe via the web, visit > http://www.python.org/mailman/listinfo/tutor > or, via email, send a message with subject or body 'help' to > tutor-request(a)python.org > You can reach the person managing the list at > tutor-admin(a)python.org > > When replying, please edit your Subject line so it is more specific than > "Re: Contents of Tutor digest..." > > > Today's Topics: > > 1. RE: (no subject) (alan.gauld(a)bt.com) > 2. Getting current path (Chris Frost) > 3. Re: Inheritance and *args and **kw (Art Siegel) > 4. Re: Getting current path (Chris Frost) > 5. Inheritance and *args (Art Siegel) > 6. Re: Inheritance and *args (Steve Spicklemire) > 7. Re: Inheritance and *args (Joseph J. Strout) > > --__--__-- > > Message: 1 > From: alan.gauld(a)bt.com > To: andyquake(a)hotmail.com, tutor(a)python.org > Subject: RE: [Tutor] (no subject) > Date: Mon, 26 Jul 1999 11:27:16 +0100 > > > can you please send me a tutorial that defines all the > > terms...like strings > > and stuff cause i don't know what all these terms mean and it's very > > confusing to me. > > Take a look at the 2 'Python for non programmer' tutorials under > documentation at the python web site. > > http://www.python.org/doc/Intros.html > > If that's still not enough then look at my (in progress) > 'Programming for beginners' tutorial which uses Pytthon, > Tcl and BASIC. It goes into more detail on the terminology > than either of the other 2. > > Specifically the Data page might help you. > > http://members.xoom.com/alan_gauld/tutor/tutindex.htm > > Alan G. > > --__--__-- > > Message: 2 > Date: Mon, 26 Jul 1999 09:34:13 -0500 > From: Chris Frost <chris(a)frostnet.advicom.net> > To: tutor(a)python.org > protocol="application/pgp-signature" > Subject: [Tutor] Getting current path > > > --2/5bycvrmDh4d1IB > Content-Type: text/plain; charset=us-ascii > Content-Transfer-Encoding: quoted-printable > > How can you find the current directory you are presently in? I'd like to > output to whatever directory a program is called from, and then load it > back reason being. > > thanks! > --=20 > Chris Frost | <http://www.frostnet.advicom.net/chris/> > -------------+------------------------------------------ > Public PGP Key: > Email chris(a)frostnet.advicom.net with the subject "retrieve pgp key" > or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml> > > --2/5bycvrmDh4d1IB > Content-Type: application/pgp-signature > > -----BEGIN PGP SIGNATURE----- > Version: PGPfreeware 5.0i for non-commercial use > MessageID: cmhcn2QRojoxlxcbk6WVRDievvZrxSss > > iQA/AwUBN5xj0+EzIlbKpewXEQIHTgCg/fP7/rWyr6lmRusIJygNNscv6X0An1e1 > 9KntB39xm+PKk3Ar2N5ilNIG > =+GIx > -----END PGP SIGNATURE----- > > --2/5bycvrmDh4d1IB-- > > --__--__-- > > Message: 3 > From: "Art Siegel" <ajs(a)ix.netcom.com> > To: "Python Tutor" <tutor(a)python.org> > Date: Mon, 26 Jul 1999 11:02:32 -0400 > charset="iso-8859-1" > Subject: [Tutor] Re: Inheritance and *args and **kw > > I create a class with only *args constructors which are handled in the > class' def __init__. > > I inherit from the class and try to add **kw args in the sub-classes def > __init__. > > But in creating an instance of the the sub-class the kw dictionary is now an > element of a tuple passed as a single argument, rather than a tuple of *args > and a dictionary of *kw. > > I think the above is probably inconherent. If anybody can see what I am > driving at, help is appreciated. > > I will try to follow up with a snippet to clarify my issue > > > > > > --__--__-- > > Message: 4 > Date: Mon, 26 Jul 1999 10:10:29 -0500 > From: Chris Frost <chris(a)frostnet.advicom.net> > To: Emile van Sebille <emile(a)FenX.com> > Cc: tutor(a)python.org > Subject: Re: [Tutor] Getting current path > protocol="application/pgp-signature" > > > --LQksG6bCIzRHxTLp > Content-Type: text/plain; charset=us-ascii > Content-Transfer-Encoding: quoted-printable > > On Mon, Jul 26, 1999 at 08:01:30AM -0700, Emile van Sebille wrote: > > Hi Chris, > >=20 > > >>> import os > > >>> os.getcwd() > > 'D:\\Program Files\\Python\\Tools\\idle' > >=20 > > HTH > Yes, thanks! > > How could I tell if the user simply entered a filename, or if they gave > the entire path (assuming unix if that helps)? > > thanks again, > --=20 > Chris Frost | <http://www.frostnet.advicom.net/chris/> > -------------+------------------------------------------ > Public PGP Key: > Email chris(a)frostnet.advicom.net with the subject "retrieve pgp key" > or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml> > > --LQksG6bCIzRHxTLp > Content-Type: application/pgp-signature > > -----BEGIN PGP SIGNATURE----- > Version: PGPfreeware 5.0i for non-commercial use > MessageID: EAj7Vkdi3hAwVZx4b2UkfWbAJ2PH4gFX > > iQA/AwUBN5xsVOEzIlbKpewXEQLNYQCfZpiylyjpDG7quQQd6fr9/ftTL70AoJ0C > HnSe0hL6RqLTz/j0hlN/Y2fg > =puey > -----END PGP SIGNATURE----- > > --LQksG6bCIzRHxTLp-- > > --__--__-- > > Message: 5 > From: "Art Siegel" <ajs(a)ix.netcom.com> > To: "Python Tutor" <tutor(a)python.org> > Date: Mon, 26 Jul 1999 12:16:18 -0400 > boundary="----=_NextPart_000_000A_01BED760.AA2D99A0" > Subject: [Tutor] Inheritance and *args > > This is a multi-part message in MIME format. > > ------=_NextPart_000_000A_01BED760.AA2D99A0 > Content-Type: text/plain; > charset="iso-8859-1" > Content-Transfer-Encoding: quoted-printable > > class Position: > def __init__(self, *args): > if args: > self.x=3Dargs[0] > self.y=3Dargs[1] > self.z=3Dargs[2] > print self.x,self.y,self.z > > class Point(Position): > def __init__(self,*args): > Position.__init__(self,args) > > Point(1,2,3) > > Result: > > Traceback (innermost last): > ... > self.y=3Dargs[1] > IndexError: tuple index out of range > > Apparently because the arguments to Point(1,2,3) is read in as a single = > element tuple, whose single element is the 3 element tuple (1,2,3). > > Whereas Position(1,2,3) is processed as a three element tuple, with = > elements 1,2,3. > > Is there a straightforward approach to accomplish above inheritance?? > > > ------=_NextPart_000_000A_01BED760.AA2D99A0 > Content-Type: text/html; > charset="iso-8859-1" > Content-Transfer-Encoding: quoted-printable > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> > <HTML> > <HEAD> > > <META content=3Dtext/html;charset=3Diso-8859-1 = > http-equiv=3DContent-Type> > <META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR> > </HEAD> > <BODY bgColor=3D#ffffff> > <DIV><FONT color=3D#000000 size=3D2>class Position:<BR> def = > __init__(self,=20 > *args):<BR>  if args:<BR>   = > self.x=3Dargs[0]<BR>  =20 > self.y=3Dargs[1]<BR>   self.z=3Dargs[2]<BR>  print=20 > self.x,self.y,self.z</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> > <DIV><FONT color=3D#000000 size=3D2>class Point(Position):<BR> def=20 > __init__(self,*args):<BR>  = > Position.__init__(self,args)<BR></FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2>Point(1,2,3)</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> > <DIV><FONT color=3D#000000 size=3D2>Result:</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2><BR>Traceback (innermost = > last):</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2>     =20 > ...<BR>    self.y=3Dargs[1]<BR>IndexError: tuple index = > out of=20 > range<BR></FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2>Apparently because the arguments to = > Point(1,2,3)=20 > is read in as a single element tuple, whose single element is the 3 = > element=20 > tuple (1,2,3).</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> > <DIV><FONT size=3D2>Whereas Position(1,2,3) is processed as a three = > element tuple,=20 > with elements 1,2,3.</FONT></DIV> > <DIV><FONT size=3D2></FONT> </DIV> > <DIV><FONT size=3D2>Is there a straightforward approach to accomplish = > above=20 > inheritance??</FONT></DIV> > <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV></BODY></HTML> > > ------=_NextPart_000_000A_01BED760.AA2D99A0-- > > > --__--__-- > > Message: 6 > Date: Mon, 26 Jul 1999 12:22:05 -0500 (EST) > From: Steve Spicklemire <steve(a)acer.spvi.com> > To: ajs(a)ix.netcom.com > CC: tutor(a)python.org > (ajs(a)ix.netcom.com) > Subject: Re: [Tutor] Inheritance and *args > > > Art, > > Try this: > > ---------------------------------------------------------------------- > > class Position: > def __init__(self, *args): > if args: > self.x=args[0] > self.y=args[1] > self.z=args[2] > print self.x,self.y,self.z > > class Point(Position): > def __init__(self,*args): > apply(Position.__init__,([self] + list(args))) > > Point(1,2,3) > > ---------------------------------------------------------------------- > > -steve > > --__--__-- > > Message: 7 > Date: Mon, 26 Jul 1999 10:24:13 -0700 > To: "Art Siegel" <ajs(a)ix.netcom.com>, "Python Tutor" <tutor(a)python.org> > From: "Joseph J. Strout" <joe(a)strout.net> > Subject: Re: [Tutor] Inheritance and *args > > --============_-1279112630==_ma============ > Content-Type: text/plain; charset="us-ascii" > > At 9:16 AM -0700 07/26/99, Art Siegel wrote: > > > self.y=args[1] > >IndexError: tuple index out of range > >Apparently because the arguments to Point(1,2,3) is read in as a single > >element tuple, whose single element is the 3 element tuple (1,2,3). > > Yep. > > >Whereas Position(1,2,3) is processed as a three element tuple, with > >elements 1,2,3. > > Yep again. > > >Is there a straightforward approach to accomplish above inheritance?? > > Yep^3. Well, reasonably straightforward -- slightly complicated by having > an additional parameter ('self'): > > apply(Position.__init__, (self,) + args) > > In cases where you have a list or tuple of arguments, but you need to pass > them to a function as separate arguments rather than a single object, you > use 'apply'. > > Cheers, > -- Joe > ,------------------------------------------------------------------. > | Joseph J. Strout Biocomputing -- The Salk Institute | > | joe(a)strout.net http://www.strout.net | > `------------------------------------------------------------------' > --============_-1279112630==_ma============ > Content-Type: text/enriched; charset="us-ascii" > > At 9:16 AM -0700 07/26/99, Art Siegel wrote: > > > <excerpt> self.y=args[1] > > IndexError: tuple index out of range > > Apparently because the arguments to Point(1,2,3) is read in as a single > element tuple, whose single element is the 3 element tuple (1,2,3). > > </excerpt> > > Yep. > > > <excerpt>Whereas Position(1,2,3) is processed as a three element tuple, > with elements 1,2,3. > > </excerpt> > > Yep again. > > > <excerpt>Is there a straightforward approach to accomplish above > inheritance?? > > </excerpt> > > Yep^3. Well, reasonably straightforward -- slightly complicated by > having an additional parameter ('self'): > > > apply(Position.__init__, (self,) + args) > > > In cases where you have a list or tuple of arguments, but you need to > pass them to a function as separate arguments rather than a single > object, you use 'apply'. > > > Cheers, > > -- Joe > > ,------------------------------------------------------------------. > > | Joseph J. Strout Biocomputing -- The Salk Institute | > > | joe(a)strout.net http://www.strout.net | > > `------------------------------------------------------------------' > > --============_-1279112630==_ma============-- > > > > --__--__-- > > _______________________________________________ > Tutor maillist - Tutor(a)python.org > http://www.python.org/mailman/listinfo/tutor > > > End of Tutor Digest > ------------------------------------------------------------------- -- Daniel Gau<plateau(a)www.linux.org.tw> -- -- webmaster of Linux Notes -- -- http://www.linux.org.tw/~plateau/linux_notes/index.htm -- -- webmaster of TwLUG -- -- http://www.linux.org.tw -- -- ICQ 30932232 -- -------------------------------------------------------------------

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Inheritance and *args
by Art Siegel July 26, 1999

July 26, 1999

class Position: def __init__(self, *args): if args: self.x=args[0] self.y=args[1] self.z=args[2] print self.x,self.y,self.z class Point(Position): def __init__(self,*args): Position.__init__(self,args) Point(1,2,3) Result: Traceback (innermost last): ... self.y=args[1] IndexError: tuple index out of range Apparently because the arguments to Point(1,2,3) is read in as a single element tuple, whose single element is the 3 element tuple (1,2,3). Whereas Position(1,2,3) is processed as a three element tuple, with elements 1,2,3. Is there a straightforward approach to accomplish above inheritance??

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Re: Inheritance and *args and **kw
by Art Siegel July 26, 1999

July 26, 1999

I create a class with only *args constructors which are handled in the class' def __init__. I inherit from the class and try to add **kw args in the sub-classes def __init__. But in creating an instance of the the sub-class the kw dictionary is now an element of a tuple passed as a single argument, rather than a tuple of *args and a dictionary of *kw. I think the above is probably inconherent. If anybody can see what I am driving at, help is appreciated. I will try to follow up with a snippet to clarify my issue

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Getting current path
by Chris Frost July 26, 1999

July 26, 1999

How can you find the current directory you are presently in? I'd like to output to whatever directory a program is called from, and then load it back reason being. thanks! -- Chris Frost | <http://www.frostnet.advicom.net/chris/> -------------+------------------------------------------ Public PGP Key: Email chris(a)frostnet.advicom.net with the subject "retrieve pgp key" or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml>

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