[Tutor] Changing modes?
Robert L Hicks
bobhicks@adelphia.net
Fri, 02 Mar 2001 12:16:33 -0500
I would like to change from digest to individual mode on this list...
- Bob
> From: tutor-request@python.org
> Reply-To: tutor@python.org
> Date: Fri, 02 Mar 2001 12:01:09 -0500
> To: tutor@python.org
> Subject: Tutor digest, Vol 1 #625 - 16 msgs
>
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> Today's Topics:
>
> 1. Re: My two cents worth re Python Newbies (Deirdre Saoirse)
> 2. Re: My two cents worth re Python Newbies (Sheila King)
> 3. Re: My two cents worth re Python Newbies (Deirdre Saoirse)
> 4. Re: My two cents worth re Python Newbies (Remco Gerlich)
> 5. Re: Tip : building Apache modules under Compaq Tru-64 Unix
> (formerly Digital Unix / OSF1) (Deirdre Saoirse)
> 6. Re: Memory Gotchas? (Kalle Svensson)
> 7. Customising TK Apps. (Sharriff Aina)
> 8. Database connectivity (GCS)
> 9. Re: Database connectivity (Lindsay Davies)
> 10. RE: Memory Gotchas? (alan.gauld@bt.com)
> 11. RE: dictionary (alan.gauld@bt.com)
> 12. Re: Customising TK Apps. (Danny Yoo)
> 13. TK icons, and a dumb question. :-) (Chris McCormick)
> 14. Re: Database connectivity (Brad Chandler)
> 15. RE: Memory Gotchas? (Tim Johnson)
>
> --__--__--
>
> Message: 1
> Date: Thu, 1 Mar 2001 23:13:57 -0800 (PST)
> From: Deirdre Saoirse <deirdre@deirdre.net>
> To: Sheila King <sheila@thinkspot.net>
> cc: <tutor@python.org>
> Subject: Re: [Tutor] My two cents worth re Python Newbies
>
> On Thu, 1 Mar 2001, Sheila King wrote:
>
>> (1) if you don't have the patience to reply to a post, because it is in a FAQ
>> or could be found by a search, then simply don't reply.
>
> There are a number of reasons I don't reply to specific posts:
>
> 1) Often, especially lately, I've simply been too busy.
>
> 2) The user asks a Windows-specific question that I don't know the answer
> to.
>
> 3) I'd need to actually open an interpreter and futz for a couple minutes
> and, while I could easily answer some questions, that takes too much
> interruption.
>
> On the other hand, I don't see questions going unanswered (at least not
> for long), so I think that the system works pretty well.
>
> --
> _Deirdre deirdre@deirdre.net http://www.deirdre.net
> "I love deadlines. I like the whooshing sound they make as they fly by."
> - Douglas Adams
>
>
>
> --__--__--
>
> Message: 2
> From: Sheila King <sheila@thinkspot.net>
> To: Deirdre Saoirse <deirdre@deirdre.net>
> Cc: <tutor@python.org>
> Subject: Re: [Tutor] My two cents worth re Python Newbies
> Date: Thu, 01 Mar 2001 23:25:42 -0800
>
> On Thu, 1 Mar 2001 23:13:57 -0800 (PST), Deirdre Saoirse <deirdre@deirdre.net>
> wrote about Re: [Tutor] My two cents worth re Python Newbies:
>
> :On the other hand, I don't see questions going unanswered (at least not
> :for long), so I think that the system works pretty well.
>
> Well, that's kind of what I was saying, only much more succinct.
>
> --
> Sheila King
> http://www.thinkspot.net/sheila/
> http://www.k12groups.org/
>
>
>
> --__--__--
>
> Message: 3
> Date: Thu, 1 Mar 2001 23:22:57 -0800 (PST)
> From: Deirdre Saoirse <deirdre@deirdre.net>
> To: Sheila King <sheila@thinkspot.net>
> cc: <tutor@python.org>
> Subject: Re: [Tutor] My two cents worth re Python Newbies
>
> On Thu, 1 Mar 2001, Sheila King wrote:
>
>> On Thu, 1 Mar 2001 23:13:57 -0800 (PST), Deirdre Saoirse
>> <deirdre@deirdre.net>
>> wrote about Re: [Tutor] My two cents worth re Python Newbies:
>>
>> :On the other hand, I don't see questions going unanswered (at least not
>> :for long), so I think that the system works pretty well.
>>
>> Well, that's kind of what I was saying, only much more succinct.
>
> That's the problem with having had Horrible Hugh as an English teacher: he
> could cut 50% out of anyone's writing without changing the meaning.
>
> And here I am trying to get my Master's degree in novel writing.
>
> I'm ruined, I say. :)
>
> --
> _Deirdre deirdre@deirdre.net http://www.deirdre.net
> "I love deadlines. I like the whooshing sound they make as they fly by."
> - Douglas Adams
>
>
>
> --__--__--
>
> Message: 4
> Date: Fri, 2 Mar 2001 08:30:48 +0100
> From: Remco Gerlich <scarblac@pino.selwerd.nl>
> To: tutor@python.org
> Subject: Re: [Tutor] My two cents worth re Python Newbies
>
> On Wed, Feb 28, 2001 at 12:43:53PM +1000, Arthur Watts wrote:
>> The majority of posts to the Tutor mailing lists are from people who
>> have tried to resolve a particular problem before resorting to the list.
>> Some, however, are simply 'noise'. I find the patient, thoughtful replies
>> given by the good souls on this list to be a real eye-opener, and I commend
>> you for your warmth and dedication when responding to newbie enquiries. My
>> own view is that the list should be for people who are able to :
>>
>> a. Read
>> b. Use a Net search engine
>> c. Navigate to www.python.org
>> d. Use the skills detailed above to find other Python resources
>
> My own view is that the list should be for people who are new to Python and
> want to learn it, and that's all.
>
> Someone on comp.lang.python asked what a text editor was and got some good
> replies. On the other hand sometimes extremely difficult questions will be
> answered real quickly as well. That's what I like about the Python community.
>
>> I realise that some may brand me elitist, but I am far from it : I
>> still have a lot to learn re. Python and other Open Source products. The key
>> is that I am prepared to actually cut some code or attempt to configure a
>> product before I fire off a posting re. a particular issue. We need to
>> welcome thinking people to the Python community, and filter out those who
>> have a problem with RTFM.
>
> This is where I totally disagree. What we need to do is help people learn
> Python. That's what this list does. If they have a problem with thinking or
> RTFM, we can teach them. If you don't want to waste time explaining stuff
> that is obvious to you, then don't.
>
> Filtering out people because they're not intelligent enough according to you
> is the most elitist idea I've heard this week.
>
> The *last* thing the community needs is people who point out "RTFM" to every
> question they see...
>
> --
> Remco Gerlich
>
>
> --__--__--
>
> Message: 5
> Date: Thu, 1 Mar 2001 23:34:41 -0800 (PST)
> From: Deirdre Saoirse <deirdre@deirdre.net>
> To: Arthur Watts <arthur.watts@gbst.com>
> cc: "'tutor@python.org'" <tutor@python.org>
> Subject: Re: [Tutor] Tip : building Apache modules under Compaq Tru-64 Unix
> (formerly Digital Unix / OSF1)
>
> On Fri, 2 Mar 2001, Arthur Watts wrote:
>
>> Those of us with Tru-64 often run into some interesting problems
>> when buiilding Open Source software, particularly software which does
>> not come with a configure script. The recent upgrade to v5.0 of Tru-64
>> caught out a lot of the configure scripts, but this tip is for those
>> who have to 'wing it' completely.
>
> Thanks. I remember when I was using 32 and 64 bit IRIX and the info was
> hard to find to get certain things to work.
>
> --
> _Deirdre deirdre@deirdre.net http://www.deirdre.net
> "I love deadlines. I like the whooshing sound they make as they fly by."
> - Douglas Adams
>
>
>
> --__--__--
>
> Message: 6
> Date: Fri, 2 Mar 2001 11:38:01 +0100
> From: Kalle Svensson <kalle@gnupung.net>
> To: tutor@python.org
> Subject: Re: [Tutor] Memory Gotchas?
>
>
> --5mCyUwZo2JvN/JJP
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: inline
> Content-Transfer-Encoding: quoted-printable
>
> Sez Tim Johnson:
>> Hello All:
>> I would appreciate being pointed towards documentation on Python
>> memory allocation.
>> =20
>> I'm especially interested in avoiding coding mistakes which could lead to
>> memory leaks.
>
> Well, there are basically two kinds of memory leaks in python programs.
>
> 1) Circular references
> [a good description here, anyone?]
> Basically, they are not a very big problem with the GC in 2.0, but may well
> bite you in 1.5.2.
> More about them in the FAQ: http://www.python.org/doc/FAQ.html#6.14
> A module by Tim Peters to detect them:
> http://www.python.org/ftp/python/contrib-09-Dec-1999/System/Cyclops.py
>
> 2) Memory leaks in C modules.
> This can be due to bad reference counting (not Py_DECREF()ing enough) or
> just ordinary C memory leaks (malloc() without free()).
> Also note that the opposite is also possible, leading to segmentation fault=
> s.
>
> HTH,
> Kalle
> --=20
> Email: kalle@gnupung.net | You can tune a filesystem, but you
> Web: http://www.gnupung.net/ | can't tune a fish. -- man tunefs(8)
> PGP fingerprint: 0C56 B171 8159 327F 1824 F5DE 74D7 80D7 BF3B B1DD
>
> --5mCyUwZo2JvN/JJP
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> --5mCyUwZo2JvN/JJP--
>
>
> --__--__--
>
> Message: 7
> Date: Fri, 2 Mar 2001 06:07:41 -0500
> From: Sharriff Aina <NHYTRO@compuserve.com>
> To: "INTERNET:tutor@python.org" <tutor@python.org>
> Subject: [Tutor] Customising TK Apps.
>
> Hi Python- Tutor list!
>
> I was wondering if one is able to customize TK applications, for example
> the little "tk" that appears in the frame bar of a TK application, my =
>
> introductory Python book from O=B4reily does not explain this feature.
>
>
> Thanks
>
>
> Sharriff
>
>
>
> --__--__--
>
> Message: 8
> Date: Fri, 2 Mar 2001 12:09:53 +0100
> From: GCS <gcs@agentsinside.com>
> To: tutor@python.org
> Subject: [Tutor] Database connectivity
>
> Hello,
>
> Can someone point me out with a good documentation how to connect to Postgres?
> I can not find any of them in the library reference. Is it supported?
>
> Regards, Laszlo
>
>
> --__--__--
>
> Message: 9
> Date: Fri, 2 Mar 2001 11:32:12 +0000
> To: tutor@python.org
> From: Lindsay Davies <Lindsay.Davies@moonshine.co.uk>
> Subject: Re: [Tutor] Database connectivity
>
> On 2/3/01, GCS wrote about '[Tutor] Database connectivity':
>> Hello,
>>
>> Can someone point me out with a good documentation how to connect to
>> Postgres?
>> I can not find any of them in the library reference. Is it supported?
>
> Here are some pointers...
>
> http://www.python.org/topics/database/DatabaseAPI-2.0.html
> http://www.python.org/topics/database/
> http://www.druid.net/pygresql/
> http://popy.sourceforge.net/
>
> Best wishes,
>
> Lindsay
>
>
>
> --__--__--
>
> Message: 10
> From: alan.gauld@bt.com
> To: tim@johnsons-web.com, tutor@python.org
> Subject: RE: [Tutor] Memory Gotchas?
> Date: Fri, 2 Mar 2001 11:24:29 -0000
>
>> I would appreciate being pointed towards documentation on Python
>> memory allocation.
>
> Well, in principle you shouldn't need to worry since
> the garbage collector will do it for you. If you try
> to be too clever and anticipate what the GC does you
> run the risk of writing code that won't work as expected
> in later versiuons of Python. Its usually better to
> just trust the GC...
>
> But if you must find out whats happening under the hood
> you can look at the Python Reference Manual about the
> Garbage Collector. ISTR it has pretty good descriptions
> of just what is colleted and when.
>
>> I'm especially interested in avoiding coding mistakes which
>> could lead to memory leaks.
>
> AFAIK, aside from circular references, there aren't too many
> possibilities. Its not like C/C++
>
> Alan g.
>
>
> --__--__--
>
> Message: 11
> From: alan.gauld@bt.com
> To: toxx@post.com, tutor@python.org
> Subject: RE: [Tutor] dictionary
> Date: Fri, 2 Mar 2001 11:20:35 -0000
>
>> i have file which contain dictionary. and i wrote some code
>> and import the dictionary from that file
>
> I assume you have a file containing some kind of
> paired information rather than a python dictionary?
> Maybe it looks like:
> ------------
> SomeKey: A string that matches the key
> AnotherKey: A string that matcher another key
> ...etc.
> ------------
>
> You have written a file that reads this file
> - maybe into a Python dictionary? I'll assume
> so...
>
>
>> and i want to add entry to existing
>> dictionary and after this to save the
>> change to original file.
>
> Add to the dictionary as normal Python:
>
> filedict['BrandNew'] = 'Yet another string'
>
> Then save the entire dictionary by closing the file,
> opening it in read mode and writing out your dictionary:
>
> close(infile)
> outfile = open('MyDictionaryFile.txt','w')
> for key in filedict.getkeys():
> outfile.writeline(key + filedict[key])
> close(outfile)
>
> Or am I making lots of wrong assumptions?
>
> Alan g.
>
>
> --__--__--
>
> Message: 12
> Date: Fri, 2 Mar 2001 04:24:37 -0800 (PST)
> From: Danny Yoo <dyoo@hkn.eecs.berkeley.edu>
> To: Sharriff Aina <NHYTRO@compuserve.com>
> cc: "INTERNET:tutor@python.org" <tutor@python.org>
> Subject: Re: [Tutor] Customising TK Apps.
>
> On Fri, 2 Mar 2001, Sharriff Aina wrote:
>
>> I was wondering if one is able to customize TK applications, for example
>> the little "tk" that appears in the frame bar of a TK application, my=20
>> introductory Python book from O=B4reily does not explain this feature.
>
> I took a quick look at a Tkinter-based game called PySol:
>
> http://wildsau.idv.uni-linz.ac.at/mfx/pysol/
>
> They have source code available, which is great, because it's one of the
> most impressive demonstrations of Tkinter use that I've seen. (Plus a
> great time waster. *grin*)
>
>
> In the PySol source code, it appears that they use the call:
>
> wm_set_icon(top, app.dataloader.findIcon())
>
> (in src/main.py)
>
> and their definition of wm_set_icon() is this:
>
> ### src/tk/tkutil.py
> def wm_set_icon(window, filename):
> if not filename:
> return
> if os.name =3D=3D "posix":
> window.wm_iconbitmap("@" + filename)
> window.wm_iconmask("@" + filename)
> ###
>
>
> wm_iconbitmap() and wm_iconmask() do appear to be real functions, from a
> quick interpreter check:
>
> ###
>>>> x =3D Tkinter.Tk()
>>>> x.wm_iconbitmap
> <method Wm.wm_iconbitmap of Tk instance at 80929d8>
>>>> x.wm_iconmask =20
> <method Wm.wm_iconmask of Tk instance at 80929d8>
> ###
>
>
> This is all a large guess though, because I'm inexperienced with Tk stuff. =
> =20
> It does seem to be doing something, though, because in Linux, that part of
> the code seems responsible for changing the icon.
>
> Can you check to see that PySol does change its icon appropriately on a
> Windows system too? If so, then we're on the right track. If not, you'll
> still have a fun solitare game installed on your system. *grin*
>
>
> Good luck!
>
>
>
> --__--__--
>
> Message: 13
> Date: Fri, 2 Mar 2001 07:01:32 -0800 (PST)
> From: Chris McCormick <livelikemad@yahoo.com>
> To: tutor@python.org
> Subject: [Tutor] TK icons, and a dumb question. :-)
>
> Someone was asking about the window icon in Tkinter.
> I'm a newbie, so I don't know how to do it myself, but
> there's a great reference called the Tkinter Life
> Preserver at the Python site: -->
> http://www.python.org/doc/life-preserver
>
> It has a section on the Tk window manager class
> (Tkinter.Wm). I think this is what you need to learn.
> It's at
> http://www.python.org/doc/life-preserver/WindowMgr.html.
>
> Then come back and tell us all how to do it. :-)
>
> Oh, and a dumb question - if you get the list in
> digest format, is there any way to resond to a
> particular thread/e-mail?
>
> - Chris (who is still working on getting reasonable
> animation out of Tkinter, dagnabit)
>
> __________________________________________________
> Do You Yahoo!?
> Get email at your own domain with Yahoo! Mail.
> http://personal.mail.yahoo.com/
>
>
> --__--__--
>
> Message: 14
> From: "Brad Chandler" <mbc2@netdoor.com>
> To: <tutor@python.org>
> Subject: Re: [Tutor] Database connectivity
> Date: Fri, 2 Mar 2001 09:45:07 -0600
>
> ----- Original Message -----
> From: "GCS" <gcs@agentsinside.com>
> To: <tutor@python.org>
> Sent: Friday, March 02, 2001 5:09 AM
> Subject: [Tutor] Database connectivity
>
>
>> Hello,
>>
>> Can someone point me out with a good documentation how to connect to
> Postgres?
>> I can not find any of them in the library reference. Is it supported?
>>
>> Regards, Laszlo
>
> I use PyGreSQL and have been very pleased with it. There are several others
> out there and I've tried one other (I can't remember the name) but couldn't
> get it to work. If you installed Python from source, you should have no
> problem compiling PyGreSQL. But if you installed from an rpm, you might
> need the development rpm as well (if there is one). You might also need the
> PostgreSQL source, I'm not sure. I installed both python and postgres from
> source so I'm not sure how it PyGreSQL would compile if had I used RPMs.
>
> Brad
>
>
>
> --__--__--
>
> Message: 15
> From: Tim Johnson <tim@johnsons-web.com>
> To: alan.gauld@bt.com,
> tim@johnsons-web.com,
> tutor@python.org
> Subject: RE: [Tutor] Memory Gotchas?
> Date: Fri, 2 Mar 2001 07:57:54 -0900
>
> Hi Alan:
> On Fri, 02 Mar 2001, alan.gauld@bt.com wrote:
> <snip>
>> But if you must find out whats happening under the hood
>> you can look at the Python Reference Manual about the
>> Garbage Collector. ISTR it has pretty good descriptions
>> of just what is colleted and when.
> Thanks...............
>>> I'm especially interested in avoiding coding mistakes which
>>> could lead to memory leaks.
>>
>> AFAIK, aside from circular references, there aren't too many
>> possibilities. Its not like C/C++
> Yippee!!
> Regards :)
> --
> Tim Johnson
> -----------
> "Of all manifestations of power,
> restraint impresses the most."
> -Thucydides
>
>
>
> --__--__--
>
> _______________________________________________
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>
>
> End of Tutor Digest