[Tutor] Tutor Digest, Vol 116, Issue 8
Fabrice Pombet
fp2161 at gmail.com
Thu Oct 3 09:49:43 CEST 2013
Message: 7
Date: Wed, 02 Oct 2013 20:50:31 +0200
From: vitsen at gmx.com
To: tutor at python.org
Subject: [Tutor] Which Python should a beginner learn?
Message-ID: <524C6AF7.5020001 at gmx.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Which version of Python should a beginner learn? 2.x or 3.x?
------------------------------
Python 3 is the way forward, and it is not more difficult than Python 2.
The frameworks/packages are becomming increasingly available for Python 3.
Yet if you are aiming at using a particular package that is not yet ported
on Python 3, you may have to go through Python 2...
2013/10/3 <tutor-request at python.org>
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> Today's Topics:
>
> 1. Re: Arbitrary-argument set function (bob gailer)
> 2. Re: sqlite3 COMMIT directive (Mark Lawrence)
> 3. Python version prior to 02/26/2006? (Fast Primes)
> 4. Re: Python version prior to 02/26/2006? (Joel Goldstick)
> 5. Re: Python version prior to 02/26/2006? (Dave Angel)
> 6. Re: Python version prior to 02/26/2006? (Steven D'Aprano)
> 7. Which Python should a beginner learn? (vitsen at gmx.com)
> 8. Re: Which Python should a beginner learn? (Mark Lawrence)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 02 Oct 2013 08:05:55 -0400
> From: bob gailer <bgailer at gmail.com>
> To: Spyros Charonis <s.charonis at gmail.com>
> Cc: tutor <tutor at python.org>
> Subject: Re: [Tutor] Arbitrary-argument set function
> Message-ID: <524C0C23.107 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 10/1/2013 6:43 PM, Spyros Charonis wrote:
> >
> > Dear Pythoners,
> >
> >
> > I am trying to extract from a set of about 20 sequences, the
> > characters which are unique to each sequence. For simplicity, imagine
> > I have only 3 "sequences" (words in this example) such as:
> >
> >
> > s1='spam'; s2='scam', s3='slam'
> >
> >
> > I would like the character that is unique to each sequence, i.e. I
> > need my function to return the list [ 'p', 'c', ',l' ]. This function
> > I am using is as follows:
> >
> >
> > def uniq(*args):
> >
> > """ FIND UNIQUE ELEMENTS OF AN ARBITRARY NUMBER OF SEQUENCES"""
> >
> > unique = []
> >
> > for i in args[0]:
> >
> > if:
> >
> > unique.append(i)
> >
> > return unique
> >
> >
> > and is returning the list [ 's', 'p', 'a', 'm' ]. Any help much
> > appreciated,
> >
> Problems with the above.
> 1 - where is the call to the function? (we can only guess what you fed it.)
> 2 - for i in args[0]: tests each character in only the first argument
> 3 - i not in args[1:] will always be True. Why?
> 4 - "characters which are unique to each sequence" is hard to translate.
> Did you mean
> "characters which appear in exactly one sequence"?
>
> BTW this sounds like homework; we are willing to give some assistance
> with HW but we need you to put more effort into your design and testing.
>
> I suggest you either run the program in some tool that will show you
> clearly what happens at each step or "desk check" it - pretend you are
> the computer and go step by step, making sure you know what each line
> does. No guessing. You always have the interactive prompt to test
> things, and the documentation to explain things.
>
> --
> Bob Gailer
> 919-636-4239
> Chapel Hill NC
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 02 Oct 2013 15:51:53 +0100
> From: Mark Lawrence <breamoreboy at yahoo.co.uk>
> To: tutor at python.org
> Subject: Re: [Tutor] sqlite3 COMMIT directive
> Message-ID: <l2hbu5$1e2$1 at ger.gmane.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 01/10/2013 12:05, Alan Gauld wrote:
> > On 01/10/13 11:41, Tim Golden wrote:
> >
> >>>>> Python, the database starts and ends transactions automatically from
> >>>>> within the execute() function.
> >>>>
> >>>> Not so, I'm afraid. If you want autocommit, you need to send an
> >>>> isolation_level of None to the .connect function.
> >
> >>> """
> >>> Connection objects can be used as context managers that automatically
> >>> commit or rollback transactions.
> >>
> >> You're sort-of correct. What happens is that the database doesn't enter
> >> autocommit mode (you'll still need to specify the right isolation level
> >> on the .connect for that). Rather, the __exit__ method of the
> >> connection-as-context-manager issues the db.commit() call which will
> >> commit anything outstanding.
> >
> > OK, That makes sense it's a bit like the file close at the end of a with
> > block. So the docs statement that it automatically commits
> > *transactions* is slightly misleading as it only commits the full
> > content of the block which could hold multiple transactions.
> >
> > Thanks for the clarification Tim.
> >
>
> I haven't followed this too closely as my SQL skills (like many others)
> are sadly out of date, but is it worth the hassle of raising an issue on
> the bug tracker to get the relevant docs changed, or is "slightly
> misleading" actually close enough?
>
> --
> Roses are red,
> Violets are blue,
> Most poems rhyme,
> But this one doesn't.
>
> Mark Lawrence
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 2 Oct 2013 13:44:11 -0400
> From: Fast Primes <fast_primes at hotmail.com>
> To: "tutor at python.org" <tutor at python.org>
> Subject: [Tutor] Python version prior to 02/26/2006?
> Message-ID: <BAY174-W30C306657D8C7B571F64CA80160 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I have a python program written in 02/26/2006. Can I still get a version
> of python that will run it?
> If so, which version and from where can I get it?
> Thx.
> fp
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> ------------------------------
>
> Message: 4
> Date: Wed, 2 Oct 2013 13:49:05 -0400
> From: Joel Goldstick <joel.goldstick at gmail.com>
> To: Fast Primes <fast_primes at hotmail.com>
> Cc: "tutor at python.org" <tutor at python.org>
> Subject: Re: [Tutor] Python version prior to 02/26/2006?
> Message-ID:
> <
> CAPM-O+zyS4TkvuO+VGs_ut9Q4bkZPwAm3M+buAx0K7+Bc-G-_A at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On Wed, Oct 2, 2013 at 1:44 PM, Fast Primes <fast_primes at hotmail.com>
> wrote:
> > I have a python program written in 02/26/2006. Can I still get a version
> of
> > python that will run it?
> >
> > If so, which version and from where can I get it?
> >
> > Thx.
> >
> > fp
> >
> > _______________________________________________
> > Tutor maillist - Tutor at python.org
> > To unsubscribe or change subscription options:
> > https://mail.python.org/mailman/listinfo/tutor
> >
> you should try to run it with the latest version of the 2.x series - 2.7
>
> If you find problems that you don't want to fix, you can always load
> any version of python on your system. Find the one that was current
> in 2006. See the python.org site for getting different versions
>
> Version 3.x series made changes that are not backward compatible with
> the 2.x series.
>
>
> --
> Joel Goldstick
> http://joelgoldstick.com
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 2 Oct 2013 18:04:48 +0000 (UTC)
> From: Dave Angel <davea at davea.name>
> To: tutor at python.org
> Subject: Re: [Tutor] Python version prior to 02/26/2006?
> Message-ID: <l2hn7u$hk2$1 at ger.gmane.org>
> Content-Type: text/plain; charset=US-ASCII
>
> On 2/10/2013 13:44, Fast Primes wrote:
>
> > I have a python program written in 02/26/2006. Can I still get a version
> of python that will run it?
> > If so, which version and from where can I get it?
> > Thx.
> > fp
> >
> > <html>
> > <head>
> > <style><!--
> > .hmmessage P
> > {
> > margin:0px;
> > padding:0px
> > }
> > body.hmmessage
> > {
> > font-size: 12pt;
> > font-family:Calibri
> > }
> > --></style></head>
> > <body class='hmmessage'><div dir='ltr'>I have a python program written
> in 02/26/2006. Can I still get a version of python that will run
> it? <div><br></div><div>If so, which version and from where can I get
> it?</div><div><br></div><div>Thx.</div><div><br></div><div>fp</div>
> </div></body>
> > </html>
> >
>
> (Please post using text email, as this is a text newsgroup)
>
> The first line of the script should indicate what version of Python it
> was written for. If not, chances are good that 2.7.5 will be fine.
>
> http://www.python.org/download/
>
>
>
> --
> DaveA
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 3 Oct 2013 04:04:00 +1000
> From: Steven D'Aprano <steve at pearwood.info>
> To: tutor at python.org
> Subject: Re: [Tutor] Python version prior to 02/26/2006?
> Message-ID: <20131002180400.GO7989 at ando>
> Content-Type: text/plain; charset=us-ascii
>
> On Wed, Oct 02, 2013 at 01:44:11PM -0400, Fast Primes wrote:
> > I have a python program written in 02/26/2006. Can I still get a version
> of python that will run it?
> > If so, which version and from where can I get it?
>
> Yes. All versions of Python going back to version 1.1 are still
> available, although the oldest ones may be difficult to install on some
> systems.
>
> What is important though is not *when* the program was written, but what
> version of Python it was written for. I could write a program today,
> targetting Python 1.5, if I was foolish.
>
> If your program is very short, you might like to show it to us. Or read
> the documentation -- does it tell you what version of Python it
> requires? Perhaps it has a line at the top of the file like:
>
> #!/usr/bin/python2.4
>
> But there is a very good chance that it will run perfectly using the
> latest Python 2.7. If not, it will probably be quite simple to fix it so
> that it will run. Fixing it to run under Python 3.3 will probably be a
> bit more work.
>
> You can download Python versions from here:
>
> http://www.python.org/download/releases/
>
> but seriously, you should try to avoid anything older than 2.7 unless
> you absolutely need it.
>
>
> --
> Steven
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 02 Oct 2013 20:50:31 +0200
> From: vitsen at gmx.com
> To: tutor at python.org
> Subject: [Tutor] Which Python should a beginner learn?
> Message-ID: <524C6AF7.5020001 at gmx.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Which version of Python should a beginner learn? 2.x or 3.x?
>
>
> ------------------------------
>
> Message: 8
> Date: Thu, 03 Oct 2013 00:59:12 +0100
> From: Mark Lawrence <breamoreboy at yahoo.co.uk>
> To: tutor at python.org
> Subject: Re: [Tutor] Which Python should a beginner learn?
> Message-ID: <l2ic0b$l2s$1 at ger.gmane.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 02/10/2013 19:50, vitsen at gmx.com wrote:
> > Which version of Python should a beginner learn? 2.x or 3.x?
> >
>
> Python 3 is the future so learn it unless you want to use a specific
> library which hasn't yet been ported.
>
> --
> Roses are red,
> Violets are blue,
> Most poems rhyme,
> But this one doesn't.
>
> Mark Lawrence
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Tutor maillist - Tutor at python.org
> https://mail.python.org/mailman/listinfo/tutor
>
>
> ------------------------------
>
> End of Tutor Digest, Vol 116, Issue 8
> *************************************
>
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