Re: [Tutor] Python books
The Head First... series of books (O'Reilly Press) adopts a wonderful, intuitive work-along format; of particular interest [to you] would be Head First Python by Paul Barry. From the virtual desk of Lowell Tackett From: Ed Owens eowens0...@gmx.com To: tutor@python.org Sent: Friday, November 9, 2012 8:18 PM Subject: [Tutor] Python books I've been trying to learn Python, writing a Blackjack program. Seems that's a common problem for learning. I'm not in a class or school, just working on my own. I've been working in Python 2.7, and considering moving up to 3.x. My programming background is ancient, having done most of my programming in FORTRAN. I have been using free internet resources to learn, mostly Google searches on syntax, and their free courses. I have the basic game done: dealing from a shoe of multiple decks, splits, betting, etc. and started to work on the harder parts such as graphics of the table with cards, managing record keeping, and so on. There seem to be a plethora of packages and options, many of them outside of the standard Python installation. Plus, I'm still discovering how to do things with the standard library. I need more structure and organization! I have one book, Python Programming for the Absolute Beginner by Dawson, which is too plodding. Can you experts recommend a Python library? I would like to have: A command reference for the basic library. A comprehensive How to course for the basic library. Graphics in Python Data Management in Python Using the internet with Python (maybe Real Time(ish) Python) A comprehensive Learn Python course that puts all this together I realize that this is outside of the help with this code request, but I would value your advice. Ed O ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Ongoing problems with Pam's new computer
Doggonit! I was half-way thru a really cool Python solution, too! From the virtual desk of Lowell Tackett From: bob gailer bgai...@gmail.com To: tutor@python.org Sent: Thursday, February 9, 2012 7:48 PM Subject: Re: [Tutor] Ongoing problems with Pam's new computer On 2/9/2012 6:56 PM, Steven D'Aprano wrote: bob gailer wrote: Today is the third time Pam (connecting to the web site for event publication) has run into an inexplicable Access error. I don't think this has anything to do with learning Python. You are right. I was surprised to discover I had entered the wrong email address. Sorry for any confusion or pollution. -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help with understanding classes
Robert...I am similarly where you are stuck, a beginner with little insight, so my perspective might have some draw to it. Try this on for size - while watching a friend stencil Christmas decorations on living room windows last year, it dawned on me that a class is quite simply - a stencil. While using a Santa Claus stencil, I watched my friend employ different features in different places; a Santa Claus here, some reindeer there, a few pine bows in another spot, and each with different colored spray paint...and the light bulb came on. Each different thing she stenciled was an instance of the class (stencil) Santa Claus. For me, that was the magic moment. Very unprofessional, I'm sure, but, hey, so what?! From the virtual desk of Lowell Tackett --- On Sat, 5/21/11, Robert Sjöblom robert.sjob...@gmail.com wrote: From: Robert Sjöblom robert.sjob...@gmail.com Subject: [Tutor] Help with understanding classes To: tutor@python.org tutor@python.org Date: Saturday, May 21, 2011, 6:24 AM I'm trying to wrap my head around classes and their attributes, but am having a hard time doing so. The websites and books that I have consulted haven't been much help; most of them assume prior programming/oop experience, something I lack. From what I understand it's a blueprint, so each time you instantiate it you run whatever's in the __self__ part is assigned to the instance. What I'm wondering is how to access and change attributes in the instance (whatever it might be; a list, a specific value, a string...). I just can't seem to grasp the concept or syntax very well, and none of the sources I've found go to great lengths explaining them to someone as thick-headed as me. So if anyone could take the time to explain, or point me to sources to read, I'd be grateful Thanks in advance, and best regards, Robert S. Sent from my iPhone ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] has it gone quiet or is it just me?
You folks are just so good at what you do here that you've answered everybody's questions. Everyone's happy right now. From the virtual desk of Lowell Tackett --- On Wed, 7/21/10, Alan Gauld alan.ga...@btinternet.com wrote: From: Alan Gauld alan.ga...@btinternet.com Subject: [Tutor] has it gone quiet or is it just me? To: tutor@python.org Date: Wednesday, July 21, 2010, 1:55 PM I haven't had any tutor messages in 2 days. Do I have a problem or are things just very quiet suddenly? The archive isn't showing anything either which makes me suspicious. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] pydoc?
From the virtual desk of Lowell Tackett --- On Fri, 6/18/10, Andrew Martin amartin7...@gmail.com wrote: From: Andrew Martin amartin7...@gmail.com Subject: [Tutor] pydoc? To: tutor@python.org Date: Friday, June 18, 2010, 1:53 PM Hey, everyone, I am new to programming and just downloaded Python 2.6 onto my windows vista laptop. I am attempting to follow 4.11 of the tutorial called How to Think Like a Computer Scientist: Learning with Python v2nd Edition documentation (http://openbookproject.net/thinkcs/python/english2e/ch04.html). However, I am having some trouble. I am trying to use pydoc to search through the python libraries installed on my computer but keep getting an error involving the $ symbol. $ pydoc -g SyntaxError: invalid syntax Can anyone help me out? Thanks You're getting awfully close. Again, assuming that you are in python; at the prompt type: pydoc modules which will list all the module names, but...it's more than one screen and you can't go backwards, so you lose the first half. So, type (instead): pydoc modules made-upfilename and you will create an ascii file (with the name you gave it) containing all the pydoc names in it. The easiest way to open that file is: less made-upfilename less is a bash command that opens files for reading. As you'll see, it will allow you to scroll forward in the file (space bar) or backwards, with the b key. To close that file, just type a q for quit. And while your at it, while at bash's ($) the command line, type in man less w/o the quotes (that stands for manual for 'less'), and begin learning how the bash commands work, and how you can access great info as to how they work. Good luck. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] help
From the virtual desk of Lowell Tackett --- On Thu, 6/17/10, Mark Lawrence breamore...@yahoo.co.uk wrote: From: Mark Lawrence breamore...@yahoo.co.uk Subject: Re: [Tutor] help To: tutor@python.org Date: Thursday, June 17, 2010, 8:30 AM On 17/06/2010 08:28, KB SU wrote: help ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Help, I need somebody, Help, not just anybody, Help, you know I need someone, help. I'll leave you to find out the rests of the lyrics. :) Mark Lawrence. You're dating yourself! (I was in 'Nam when that song came out.) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] the binary math wall
From the virtual desk of Lowell Tackett
--- On Tue, 4/20/10, Steven D'Aprano st...@pearwood.info wrote:
From: Steven D'Aprano st...@pearwood.info
Subject: Re: [Tutor] the binary math wall
To: tutor@python.org
Date: Tuesday, April 20, 2010, 7:39 PM
On Wed, 21 Apr 2010 02:58:06 am
Lowell Tackett wrote:
I'm running headlong into the dilemma of binary math
representation,
with game-ending consequences, e.g.:
0.15
But if you really need D.MMSS floats, then something like
this should be
a good start.:
def dms2deg(f):
Convert a floating point number formatted
as D.MMSS
into degrees.
mmss, d = math.modf(f)
assert d == int(f)
if mmss = 0.60:
raise ValueError(
'bad fractional part, expected
.60 but got %f' % mmss)
mmss *= 100
m = round(mmss)
if m = 60:
raise ValueError('bad minutes,
expected 60 but got %d' % m)
s = round((mmss - m)*100, 8)
if not 0 = s 60.0:
raise ValueError('bad seconds,
expected 60.0 but got %f' % s)
return d + m/60.0 + s/3600.0
dms2deg(18.15)
18.25
dms2deg(18.1515)
18.2541666
Haven't gone away...I'm having a blast dissecting (parsing[?]-is that the right
word?) your script snippet! Got a big pot of coffee fueling the effort.
Note though that this still fails with some valid input. I
will leave
fixing it as an exercise (or I might work on it later, time
permitting).
Got the hint...I'm gonna pick up this challenge. This effort is taking me in
endless tangents (all productive)-I'll be back sometime [soon] with my efforts
and results. Thanks for your [own] time and effort.
--
Steven D'Aprano
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Re: [Tutor] the binary math wall
From the virtual desk of Lowell Tackett --- On Wed, 4/21/10, Dave Angel da...@ieee.org wrote: From: Dave Angel da...@ieee.org Subject: Re: [Tutor] the binary math wall To: Lowell Tackett lowelltack...@yahoo.com Cc: tutor@python.org, Steven D'Aprano st...@pearwood.info Date: Wednesday, April 21, 2010, 6:46 AM Lowell Tackett wrote: --- On Tue, 4/20/10, Steven D'Aprano st...@pearwood.info wrote: From: Steven D'Aprano st...@pearwood.info snip The simplest, roughest way...hit them with a hammer: round(18.15*100) == 1815 True ...when I tried...: Python 2.5.1 (r251:54863, Oct 14 2007, 12:51:35) [GCC 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)] on linux2 Type help, copyright, credits or license for more information. round(18.15)*100 == 1815 False snip But you typed it differently than Steven. He had round(18.15*100), and you used round(18.15)*100 As soon as I'd posted my answer I realized this mistake. Very different. His point boils down to comparing integers, and when you have dubious values, round them to an integer before comparing. I have my doubts, since in this case it would lead to bigger sloppiness than necessary. round(18.154 *100) == 1815 probably isn't what you'd want. So let me ask again, are all angles a whole number of seconds? Or can you make some assumption about how accurate they need to be when first input (like tenths of a second, or whatever)? If so use an integer as follows: val = rounddegrees*60)+minutes)*60) + seconds)*10) The 10 above is assuming that tenths of a second are your quantization. HTH DaveA Recalling (from a brief foray into college Chem.) that a result could not be displayed with precision greater than the least precise component that bore [the result]. So, yes, I could accept my input as the arbitrator of accuracy. A scenario: Calculating the coordinates of a forward station from a given base station would require [perhaps] the bearing (an angle from north, say) and distance from hither to there. Calculating the north coordinate would set up this relationship, e.g.: cos(3° 22' 49.6) x 415.9207'(Hyp) = adjacent side(North) My first requirement, and this is the struggle I (we) are now engaged in, is to convert my bearing angle (3° 22' 49.6) to decimal degrees, such that I can assign its' proper cosine value. Now, I am multiplying these two very refined values (yes, the distance really is honed down to 10,000'ths of a foot-that's normal in surveying data); within the bowels of the computer's blackboard scratch-pad, I cannot allow errors to evolve and emerge. Were I to accumulate many of these legs into perhaps a 15 mile traverse-accumulating little computer errors along the way-the end result could be catastrophically wrong. (Recall that in the great India Survey in the 1800's, Waugh got the elevation of Mt. Everest wrong by almost 30' feet for just this exact same reason.) In surveying, we have a saying, Measure with a micrometer, mark with chalk, cut with an axe. Accuracy [in math] is a sacred tenet. So, I am setting my self very high standards of accuracy, simply because those are the standards imposed by the project I am adapting, and I can require nothing less of my finished project. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] the binary math wall
From the virtual desk of Lowell Tackett --- On Wed, 4/21/10, Dave Angel da...@ieee.org wrote: From: Dave Angel da...@ieee.org Subject: Re: [Tutor] the binary math wall To: Lowell Tackett lowelltack...@yahoo.com Cc: tutor@python.org, Steven D'Aprano st...@pearwood.info Date: Wednesday, April 21, 2010, 12:31 PM Lowell Tackett wrote: From the virtual desk of Lowell Tackett *Whole buncha stuff snipped* Anyway, in your case binary floating point is irrelevant. You've got to do your own error analysis of every step in the calculation to understand how much you can trust the result. And it's unlikely the errors in the math package will be the limiting factor. DaveA The sense of all this is beginning to emerge (perhaps). Emile has just made a good point, simply convert all to whole values (using a subset algorithm that keeps track of the number of decimal slips that have accumulated-for later reconversion), crunch merrily away, and get good results. Maybe that's valid, maybe not. But I do know that this much is happening; I'm now beginning to quantify very novel and wide ranging ideas way outside the box I'd originally approached the challenge with. That's the bigger value of this entire exercise, I think. Naively thinking that the computer was benign and forgiving, I'd first opted for the most transparent and 'at hand' solutions...there was much to be learned. I know a coupla things now...I'm gonna solve this dilemma, and largely with the help of all who've weighed in. The solution may ultimately not be close to what has been suggested, but isn't that the fun of it all? Secondly, there has accumulated [here] quite an array of novel (to me) thinking that I'm going to return to more and more as I tackle other, different projects, for the pedagogical value that will linger. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] the binary math wall
I'm running headlong into the dilemma of binary math representation, with game-ending consequences, e.g.: 0.15 0.14999 Obviously, any attempts to manipulate this value, under the misguided assumption that it is truly 0.15 are ill-advised, with inevitable bad results. the particular problem I'm attempting to corral is thus: math.modf(18.15) (0.14858, 18.0) with some intermediate scrunching, the above snippet morphs to: (math.modf(math.modf(18.15)[0]*100)[0])/.6 1.4298 The last line should be zero, and needs to be for me to continue this algorithm. Any of Python's help-aids that I apply to sort things out, such as formatting (%), or modules like decimal do nothing more than powder up the display for visual consumption (turning it into a string). The underlying float value remains corrupted, and any attempt to continue with the math adapts and re-incorporates the corruption. What I'm shooting for, by the way, is an algorithm that converts a deg/min/sec formatted number to decimal degrees. It [mostly] worked, until I stumbled upon the peculiar cases of 15 minutes and/or 45 minutes, which exposed the flaw. What to do? I dunno. I'm throwing up my hands, and appealing to the Council. (As an [unconnected] aside, I have submitted this query as best I know how, using plain text and the tu...@... address. There is something that either I, or my yahoo.com mailer *or both* doesn't quite get about these mailings. But, I simply do my best, following advice I've been offered via this forum. Hope this --mostly-- works.) From the virtual desk of Lowell Tackett ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] the binary math wall
From the virtual desk of Lowell Tackett
--- On Tue, 4/20/10, Luke Paireepinart rabidpoob...@gmail.com wrote:
From: Luke Paireepinart rabidpoob...@gmail.com
Subject: Re: [Tutor] the binary math wall
To: Lowell Tackett lowelltack...@yahoo.com
Cc: tutor Tutor@python.org
Date: Tuesday, April 20, 2010, 1:20 PM
On Tue, Apr 20, 2010 at 11:58 AM,
Lowell Tackett
lowelltack...@yahoo.com
wrote:
I'm running headlong into the dilemma of binary math
representation, with game-ending consequences, e.g.:
0.15
0.14999
Yes, floats are slightly inaccurate.
But I think your problem is that your math is wrong.
You are assuming...
If your equations cannot handle this, then coerce the value
to 1.
if .999 i 1.1:
i = 1
And before you say but that is just a hack, no, that is
the nature...
But you really just need to adapt...
May I suggest another approach though?
Consider this:
a = 18.15
a
18.149
a = '18.15'
degree, min = map(int, a.split('.'))
degree
18
min
15
Supposing you get your input as a string.
Basically the second you let your value end up stored as a
float,
there's no turning back...
Eventually you will develop a distrust for floats...
Hope that helps,
-Luke
I was gonna go out jogging - and in a coupla hours check to see if anyone had
tried to take this on; going out the door I decided to take a quick look.
Ahem...
These responses just blow me away on a couple of levels. I'm choosing
Luke's offering as representative. Within minutes some great folks had
read, parsed, and re-structured my query. My narrow focus yells out my
inexperience...I was trying as hard as I could, with limited tools, to solve
the issue. That's fine. But...the breadth and depth of the responses
represent nothing short of a paradigm shift in my window into this world of
hacking.
Ya'll have insights of a scale unimagined in the confines of my thinking box.
(Now, I gotta go out and jog just to clear my head!) Then come back...and
pull the blinds closed...and absorb; and come up for air in maybe a week or so.
And only then, be able to offer my thanks with an objective sense of how much
I've been helped today...Wow!
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Re: [Tutor] the binary math wall
From the virtual desk of Lowell Tackett
--- On Tue, 4/20/10, Steven D'Aprano st...@pearwood.info wrote:
From: Steven D'Aprano st...@pearwood.info
Subject: Re: [Tutor] the binary math wall
To: tutor@python.org
Date: Tuesday, April 20, 2010, 7:39 PM
On Wed, 21 Apr 2010 02:58:06 am
Lowell Tackett wrote:
I'm running headlong into the dilemma of binary math
representation,
with game-ending consequences, e.g.:
0.15
0.14999
Obviously, any attempts to manipulate this value,
under the misguided
assumption that it is truly 0.15 are ill-advised,
with inevitable
bad results.
That really depends on what sort of manipulation you are
doing.
x = 0.15
x
0.14999
x*100 == 15
True
Seems pretty accurate to me.
However:
18.15*100 == 1815
False
The simplest, roughest way to fix these sorts of problems
(at the risk
of creating *other* problems!) is to hit them with a
hammer:
round(18.15*100) == 1815
True
Interestingly, this is the [above] result when I tried entered the same snippet:
Python 2.5.1 (r251:54863, Oct 14 2007, 12:51:35)
[GCC 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)] on linux2
Type help, copyright, credits or license for more information.
round(18.15)*100 == 1815
False
But...I'm just offering that for its' curiosity value, not to contradict your
comments or the case you are making.
[...]
What I'm shooting...is an algorithm
that converts a
deg/min/sec formatted number to decimal degrees.
It [mostly] worked...which exposed the flaw.
I'm afraid that due to the nature of floating point, this
is a hard
problem. Even the professionals at Hewlett-Packard's
scientific
calculator division don't always get it right, and they are
*extremely*
careful:
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv018.cgi?read=132690
Interesting that you raise the *hallowed* 48GX as a standard. I have one (of
the two I own) sitting next to me here, and have been using it as the bar
against which to compare my computer. Using the HMS+/-/- etc. functions, I
get pretty darned accurate results. (Wish I'd known in time that HP was gonna
throw the 48's down the drain-I would own a lot more than two of them!)
The best result I can suggest is, change the problem! Don't
pass
degrees-minutes-seconds around using a floating point
value, but as a
tuple with distinct (DEG, MIN, SEC) integer values. Or
create a custom
class.
But if you really need D.MMSS floats, then something like
this should be
a good start.:
def dms2deg(f):
Convert a floating point number formatted
as D.MMSS
into degrees.
mmss, d = math.modf(f)
assert d == int(f)
if mmss = 0.60:
raise ValueError(
'bad fractional part, expected
.60 but got %f' % mmss)
mmss *= 100
m = round(mmss)
if m = 60:
raise ValueError('bad minutes,
expected 60 but got %d' % m)
s = round((mmss - m)*100, 8)
if not 0 = s 60.0:
raise ValueError('bad seconds,
expected 60.0 but got %f' % s)
return d + m/60.0 + s/3600.0
dms2deg(18.15)
18.25
dms2deg(18.1515)
18.2541666
which compares well to my HP-48GX:
18.15 HMS-
gives 18.25, and:
18.1515 HMS-
gives 18.254167.
Note though that this still fails with some valid input. I
will leave
fixing it as an exercise (or I might work on it later, time
permitting).
--
Steven D'Aprano
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What you've provided with your comments is more of what I've received wholesale
in this entire discourse--an incredible wealth of new insight and ways of
looking at the problem. Don't think you grasp how new I am at this, and how
even what little I've tried to pull off-on my own-is way out at the edge of
the box for me. Someone wondered if performance was an issue that could
effect my choices. Well, no. Basically, I want to manipulate [land] survey
data - you know, coordinates and stuff - so the goal here is coding those
things that will yield accurate number results.
I've been handed, in response, comments about the challenges going all the way
back to the early days of Fortran, stuff I had no concept of. This is all
fantastic, and it's gonna take a long time for me to assimilate and absorb what
has been offered. Even your comment concerning creating a class--my reaction
is Oh, oh--classes? What'da I do NOW?! But, I've been given a great deal to
chew on, and the implications go way beyond the scope of my original query.
Did I get what I asked for when I posed my question? I'd say so...about 10X!
Now I gotta go to work and gain some good knowledge out of this mountain of
advice that's been piled on my desk!
Thanks, all...
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Re: [Tutor] python magazine
From the virtual desk of Lowell Tackett --- On Sat, 3/27/10, Dave Angel da...@ieee.org wrote: From: Dave Angel da...@ieee.org Subject: Re: [Tutor] python magazine To: Lowell Tackett lowelltack...@yahoo.com Cc: Benno Lang transmogribe...@gmail.com, tutor@python.org Date: Saturday, March 27, 2010, 6:12 AM Lowell Tackett wrote: From the virtual desk of Lowell Tackett --- On Fri, 3/26/10, Benno Lang transmogribe...@gmail.com wrote: From: Benno Lang transmogribe...@gmail.com Subject: Re: [Tutor] python magazine To: Lowell Tackett lowelltack...@yahoo.com Cc: tutor@python.org, Bala subramanian bala.biophys...@gmail.com Date: Friday, March 26, 2010, 8:38 PM On 27 March 2010 00:33, Lowell Tackett lowelltack...@yahoo.com wrote: The Python Magazine people have now got a Twitter site--which includes a perhaps [telling] misspelling. Obviously that's why they're looking for a chief editor - maybe it's even a deliberate ploy. I'm not sure if this affects others, but to me your replies appear inside the quoted section of your mail, rather than beneath it. Would you mind writing plain text emails to avoid this issue? Thanks, benno Like this...? No, there's still a problem. You'll notice in this message that there are symbols in front of your lines and benno's, and symbols in front of Lowell's. (Some email readers will turn the into vertical bar, but the effect is the same). Your email program should be adding those upon a reply, so that your own message has one less than the one to which you're replying. Then everyone reading can see who wrote what, based on how many or bars precede the respective lines. Quotes from older messages have more of them. Are you using Reply-All in your email program? Or are you constructing a new message with copy/paste? What email are you using? Maybe it's a configuration setting somebody could help with. DaveA Don't really know what I'm doing wrong (or right). Just using the [email] tools that have been made available to me thru Yahoo mail and Firefox. I began this text below your submission and signature, and I'm using plain text, as suggested by a previous comment. Don't know what else I could embellish this effort with. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python magazine
From the virtual desk of Lowell Tackett --- On Fri, 3/26/10, Bala subramanian bala.biophys...@gmail.com wrote: From: Bala subramanian bala.biophys...@gmail.com Subject: [Tutor] python magazine To: tutor@python.org Date: Friday, March 26, 2010, 8:07 AM Friends, I am sorry if this query is not appropriate to this forum. Is there any online magazine dedicated to python especially its features and How-to's that i can subscribe for. Thanks, Bala -Inline Attachment Follows- http://twitter.com/pymag The Python Magazine people have now got a Twitter site--which includes a perhaps [telling] misspelling. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python magazine
From the virtual desk of Lowell Tackett --- On Fri, 3/26/10, John jo...@jfcomputer.com wrote: From: John jo...@jfcomputer.com Subject: Re: [Tutor] python magazine To: tutor@python.org Date: Friday, March 26, 2010, 2:32 PM On Friday 26 March 2010 08:33:35 am Lowell Tackett wrote: From the virtual desk of Lowell Tackett --- On Fri, 3/26/10, Bala subramanian bala.biophys...@gmail.com wrote: From: Bala subramanian bala.biophys...@gmail.com Subject: [Tutor] python magazine To: tutor@python.org Date: Friday, March 26, 2010, 8:07 AM Friends, I am sorry if this query is not appropriate to this forum. Is there any online magazine dedicated to python especially its features and How-to's that i can subscribe for. Thanks, Bala -Inline Attachment Follows- http://twitter.com/pymag The Python Magazine people have now got a Twitter site--which includes a perhaps [telling] misspelling. Last updated Jun 2009??? Johnf Look again...6:32 AM Mar16th ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python magazine
From the virtual desk of Lowell Tackett --- On Fri, 3/26/10, Benno Lang transmogribe...@gmail.com wrote: From: Benno Lang transmogribe...@gmail.com Subject: Re: [Tutor] python magazine To: Lowell Tackett lowelltack...@yahoo.com Cc: tutor@python.org, Bala subramanian bala.biophys...@gmail.com Date: Friday, March 26, 2010, 8:38 PM On 27 March 2010 00:33, Lowell Tackett lowelltack...@yahoo.com wrote: The Python Magazine people have now got a Twitter site--which includes a perhaps [telling] misspelling. Obviously that's why they're looking for a chief editor - maybe it's even a deliberate ploy. I'm not sure if this affects others, but to me your replies appear inside the quoted section of your mail, rather than beneath it. Would you mind writing plain text emails to avoid this issue? Thanks, benno Like this...? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What Editori?
The environment [OS} of choice can do a lot to expand/enhance the capabilities of an editor. I fell upon Vim from the beginning, and stayed with it for its' rich palate of features and adaptability (and of course, the often...and exhilarating oh, Vim can do that!). But beyond that, the Linux platform I work within offers its own dimension. Generally, I will split a [terminal] screen into two (or even 3) virtual screens with bash's 'screen' workhorse, and from there I have in front of me [perhaps] a; 1) script edit screen, 2) interactive screen, and 3) script-launching screen...all on the same physical monitor. For me, that combination creates an awfully rich deep working canvas. The whole...is at least as great as the sum of its' parts. From the virtual desk of Lowell Tackett --- On Tue, 2/23/10, Giorgio anothernetfel...@gmail.com wrote: From: Giorgio anothernetfel...@gmail.com Subject: [Tutor] What Editori? To: tutor@python.org Date: Tuesday, February 23, 2010, 11:24 AM Hi All, what text-editor do you use for python? I've always used kate/nano on Linux and Notepad++/PSPad on Win. Today i've installed portablepython to my pendrive, and found pyscripter in that. It's nice! Do you think it's a good editor? Do you know other names? Giorgio -- -- AnotherNetFellow Email: anothernetfel...@gmail.com -Inline Attachment Follows- ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Question on import foobar vs from foobar import *
If I might offer one small comment... It seems to me that this argument also goes to a code readability issue; ergo, if you choose from foobar... as opposed to import foobar, then from that point on you only need employ foobar's methods in your code, and they are not alway easily recognizable. i.e, by importing foobar, you will always prefix a method with its' parent module name, which [I think] makes the code more understandable. From the virtual desk of Lowell Tackett --- On Sat, 1/9/10, Alan Gauld alan.ga...@btinternet.com wrote: From: Alan Gauld alan.ga...@btinternet.com Subject: Re: [Tutor] Question on import foobar vs from foobar import * To: tutor@python.org Date: Saturday, January 9, 2010, 10:21 AM Rob Cherry pythontu...@lxrb.com wrote Extending on this advice somewhat - is it *ever* correct to import foobar. Yes, it is *usually* correct to import foobar and rarely correct to from foobar. The exception being if you only need one or two names from foobar, but usually you need a lot more, in which case use import foobar. To save typing you can give foobar a shorter name: import foobar as fb For some reason that convenience feature doesn't get mentioned all that often but I use it a lot. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] manipulting CSV files
From the virtual desk of Lowell Tackett
--- On Fri, 1/8/10, Kent Johnson ken...@tds.net wrote:
From: Kent Johnson ken...@tds.net
Subject: Re: [Tutor] manipulting CSV files
To: Lowell Tackett lowelltack...@yahoo.com
Cc: tutor Tutor@python.org
Date: Friday, January 8, 2010, 8:11 AM
On Thu, Jan 7, 2010 at 1:26 PM,
Lowell Tackett lowelltack...@yahoo.com
wrote:
I found the Python documentation (on line} and came
across--'csv.Dialect.skipinitialspace'
Try
coord = csv.reader(open('true_coord', 'b'),
skipinitialspace = True)
Note you should open the file in binary mode.
Kent
I'm guessing the 'b' in the above code line refers to your recommendation to
enlist binary mode. Here's what Python thought of it:
coord = csv.reader(open('true_coord', 'b'), skipinitialspace = True)
Traceback (most recent call last):
File stdin, line 1, in module
ValueError: mode string must begin with one of 'r', 'w', 'a' or 'U', not 'b'
So, I put an 'r' in front of 'b', and it worked fine.
Now, perhaps you can you shed some light on this problem--I'm trying to do some
simple arithmetic with two of the retrieved values, and get this error:
coord = csv.reader(open('true_coord', 'rb'), skipinitialspace = True)
for line in coord:
if line[0] == '1001':
print line
['1001', '342821.71900', '679492.08300', '0.0', '']
print (int(line[1]) + int(line[2]))
Traceback (most recent call last):
File stdin, line 3, in module
ValueError: invalid literal for int() with base 10: '342821.71900'
I tried:
print (line[1]) + (line[2])
But of course it did nothing but cat the two sequences.
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Re: [Tutor] manipulting CSV files
From the virtual desk of Lowell Tackett
--- On Fri, 1/8/10, Kent Johnson ken...@tds.net wrote:
From: Kent Johnson ken...@tds.net
Subject: Re: [Tutor] manipulting CSV files
To: Lowell Tackett lowelltack...@yahoo.com
Cc: tutor Tutor@python.org
Date: Friday, January 8, 2010, 10:07 AM
Well, it's right - that is not a valid integer. What do you
want to do
with it? You could convert it to a number with
float(line[2]) or get
just the integer part with int(line[2].split('.')[0]).
Kent
Oh...
I hadn't grasped the subtle meaning of int(); thanks, that helps. So, here's
the (happy) result:
coord = csv.reader(open('true_coord', 'rb'), skipinitialspace = True)
for line in coord:
if line[0] == '1001':
print [float(line[1]) + float(line[2])]
[1022313.801999]
Please keep in mind, as I'd mentioned earlier, all of this is fairly new
concepts to me; from running an interpretive Python screen, to delving into the
zen of computing, [even] to pasting stuff from there to here--there's about 4
different Learn Python and Make New Friends books strewn around me and my
computer desk right now, opened to different subjects (and the Joy of Google
waiting on the internet) and with all that I want to develop to where I can
create some pretty expansive scripts dealing with land surveying
stuff--manipulating coordinates, inversing, traversing, bearings, etc., etc.
Ya'll are meeting me here pretty much on the proverbial First Step of the
1000-mile journey, so all the help is very welcome and appreciated. Thanks.
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Re: [Tutor] formatting*
From the virtual desk of Lowell Tackett --- On Fri, 1/8/10, spir denis.s...@free.fr wrote: From: spir denis.s...@free.fr Subject: Re: [Tutor] formatting* To: tutor@python.org Date: Friday, January 8, 2010, 7:27 AM Lowell Tackett dixit: Yo, that's because you're viewing the source as plain text,... Denis la vita e estrany In the meantime, posing this query took me somewhere I hadn't imagined...I got turned on to the 'Gmane' mailsite, which pretty much solved all my issues, plus presented a much nicer 'reading room'. After rummaging around awhile I've got the site figured out enough to make good use of it (a tip of the hat to Alan Gauld for the reference to that great site). ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] $PYTHONSTARTUP
I'm not certain if this is more correctly a bash issue, but it seems logical to
at least start here. What I hope to do is set some standard commands (whenever
I open an interactive python shell) as are outlined in the Python.org tutorial:
2.2.4. The Interactive Startup File¶
When you use Python interactively, it is frequently handy to have some standard
commands executed every time the interpreter is started. You can do this by
setting an environment variable named PYTHONSTARTUP to the name of a
file containing your start-up commands. This is similar to the .profile
feature of the Unix shells.
Toward this end, I created a file that I called 'mypythonrc' and expanded the
$PYTHONSTARTUP [bash] environmental file (in my '.bashrc' file) to include
it--then I [re]sourced my '~/.bashrc' file to include the new entry. The
validity of that step shows up here:
Fri Jan 08:lowell:Coord]:$echo $PYTHONSTARTUP
/etc/pythonrc.py:/home/lowell/bash_function/mypythonrc
The details of the file 'mypythonrc' are here:
1 #!/usr/bin/python
2
3 import csv
4 import os
5 filename = os.environ.get('PYTHONSTARTUP')
6 if filename and os.path.isfile(filename):
7 execfile(filename)
The results are...well, there are none. The expectation [is] that whenever I
open up an interactive Python shell the two modules 'csv' and 'os' will be
pre-imported, and waiting for my use. Ain't happenin'.
So, again...is this the right venue for my question, or does it hafta be
settled over at one of the (I guess if I hafta, I hafta) Linux forums?
From the virtual desk of Lowell Tackett
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[Tutor] manipulting CSV files
Displayed below is an extract from a CSV file that displays some [land
surveying] coordinates:
1001, 342821.71900, 679492.08300, 0.0,
1002, 342838.55786, 679909.81375, 0.0,
1003, 342965.61860, 679911.34762, 0.0,
1004, 343012.82497, 680338.36624, 0.0,
1005, 342783.08155, 680347.62727, 0.0,
1006, 342623.01979, 679547.20429, 0.0,
I intend to use data such as this along with my Mandrake 10.1 OS and Python
2.5.1 to create some apps that will manipulate coordinate data as I wish.
Obviously, one of my first steps is to be able to discriminatingly access and
use the available file data. (As a reference point of knowledgeI am
grasping this effort as a way to introduce myself to programming in general,
and Python in particular. Whatever I absorb/display/offer here will be for the
first time ever, and each step will push my envelop.)
Had originally intended to unpack the data such as:
pt_no, north, east, elev = ('blah, blah')
until I ran across the csv module. Had accomplished this:
coord = csv.reader(open('true_coord'))
for line in coord:
print line
[' 1001', ' 342821.71900', ' 679492.08300', ' 0.0', ' ']
[' 1002', ' 342838.55786', ' 679909.81375', ' 0.0', ' ']
[' 1003', ' 342965.61860', ' 679911.34762', ' 0.0', ' ']
[' 1004', ' 343012.82497', ' 680338.36624', ' 0.0', ' ']
[' 1005', ' 342783.08155', ' 680347.62727', ' 0.0', ' ']
[' 1006', ' 342623.01979', ' 679547.20429', ' 0.0', ' ']
when I realized that the procedure had included leading white space.
Attempting to remedy that, I found the Python documentation (on line} and came
across--'csv.Dialect.skipinitialspace' which I believe is the answer to my
dilemma. However, my effort to implement that detail, based on interpreting
the skimpy examples in the documentation:
coord = csv.reader(open('true_coord'),csv.Dialect.skipinitialspace = True)
got me roundly shot down with:
File stdin, line 1
SyntaxError: keyword can't be an expression
My seemingly endless stabs at attempting variations on that code line are going
nowhere, so I lay my case before the Council of Coders.
From the virtual desk of Lowell Tackett
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[Tutor] formatting*
*No, not in Python...in this Tutor format. How do I include line breaks in text so the lines in the Tutor Archives wrap (as opposed to stretching halfway to Idaho)? From the virtual desk of Lowell Tackett ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] formatting*
I'm using Mandrake 10.1 [Linux] OS to view the internet thru Firefox. In my mailbox, everything is fine--my stuff formats well (and when it comes back to me as Tutor 'mail' it also formats correctly). The problem is over at the Tutor Archives (mail.python.org/pipermail/tutor), i.e., the Tutor forum site. That's where whatever I composed formats out with no line wrap, and a paragraph becomes a single line, stretching out however far it needs to. In all the time I've been perusing the forum (before jumping in to participate) I have seen occasionally a contributor's offering will suffer the same fate. Now my entries are doing so as well. I don't know if everybody who goes to the forum site sees these format problems as I do (apparently not--from your response), but there they are on my screen. Hope I've answered your questions with some degree of understandability. From the virtual desk of Lowell Tackett --- On Thu, 1/7/10, Alan Gauld alan.ga...@btinternet.com wrote: From: Alan Gauld alan.ga...@btinternet.com Subject: Re: [Tutor] formatting* To: tutor@python.org Date: Thursday, January 7, 2010, 4:59 PM Lowell Tackett lowelltack...@yahoo.com wrote *No, not in Python...in this Tutor format. How do I include line breaks in text so the lines in the Tutor Archives wrap (as opposed to stretching halfway to Idaho)? How are you viewing the messages? I have never seen that problem. Are you using a web browser or a newsreader? Which OS, which site? -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] formatting*
Well, not a lot of luck. What I use is Yahoo mail (whatever that is---a thick client??), and thus far I can't find any tool bars that offer help. An odd aside, however--I went into the Tutor Archives forum and pulled up the Page Source (HTML formatting template) and lo and behold all my paragraphs were correctly formatted (i.e. page-wrapped just as they had been when they left my mail notepad) and displayed correctly--on the source page. So,who knows...(?) From the virtual desk of Lowell Tackett --- On Thu, 1/7/10, ALAN GAULD alan.ga...@btinternet.com wrote: From: ALAN GAULD alan.ga...@btinternet.com Subject: Re: [Tutor] formatting* To: Lowell Tackett lowelltack...@yahoo.com, tutor@python.org Date: Thursday, January 7, 2010, 5:36 PM I'm using Mandrake 10.1 [Linux] OS to view the internet thru Firefox. In my mailbox, everything is fine--my stuff formats well (and when it comes back to me as Tutor 'mail' it also formats correctly). The problem is over at the Tutor Archives (mail.python.org/pipermail/tutor), i.e., the Tutor forum site. That's where whatever I composed formats out with no line wrap, and a paragraph becomes a single line, Yes I see that. I don't use that archive I normally use gmane... However that is probably down to whatever mail program you are using to post with. Is it a web client or a full blown thick client mail tool like Thunderbird? Whichever, it probably has an option to automatically wrap sent text and I suspect you have that turned off. A good value is usually around 70 or 80 chars. FWIW I have the opposite problem using gmail, it consistently wraps my text prematurely leaving my paragraphs badly formatted. And I can't find where to change the setting! HTH, Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] formatting*
Well, Ok then, I have switched to plain text to transmit this response. I will follow it over to the archive forum to see how the difference works. In the meantime...this back-and-forth dialog has at least made me aware of gmane, a website I had not been aware of. Interesting place. I was over there, looking around, and trying to figure it out. Found some of this correspondence set there, pretty much in isolation. It's a quirky place that I'm trying to figure out. Only a few of the most current items seem to be available (unlike the Tutor Archive forum, where an entire month's submittals are all lined up and available for sequential reading). Does one need to sign up in someway or another to make the entire site available? Thanks for your help and input with all of this. From the virtual desk of Lowell Tackett --- On Thu, 1/7/10, Alan Gauld alan.ga...@btinternet.com wrote: From: Alan Gauld alan.ga...@btinternet.com Subject: Re: [Tutor] formatting* To: tutor@python.org Date: Thursday, January 7, 2010, 7:25 PM Lowell Tackett lowelltack...@yahoo.com wrote Well, not a lot of luck. What I use is Yahoo mail (whatever that is---a thick client??), and thus far I can't find any tool bars that offer help. A thick client is an application that runs on your desktop with built in intelligence. A thin client is a GUI within a browser that has all the intelligence on a server - typically a web app. Yahoo is a thin client. As it happens I use it too. You should find at the end of the subject line on outgoing messages an option to switch to plain text. Select that and you should find your line breaks are recognised. (HTML does not recognise your line breaks and tries to leave formatting to the browser. The archive page obviously gets confused by this! But using HTML to a mailing list causes other problems too so its best to send as plain text) HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] way to see code execution in real-time?
Try the pdb module--the python debugger. From the virtual desk of Lowell Tackett --- On Fri, 10/16/09, Serdar Tumgoren zstumgo...@gmail.com wrote: From: Serdar Tumgoren zstumgo...@gmail.com Subject: [Tutor] way to see code execution in real-time? To: Python Tutor Tutor@python.org Date: Friday, October 16, 2009, 9:53 AM Hello everybody, I was wondering -- is there a way to watch a program execute by piping a report of its actions to standard output or to a file? Basically, I'd like to see the order that functions/methods are executing as they happen, along with how long each one takes. Is this something cProfile would do, or is there another tool built for that purpose? Thanks! Serdar ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Organizing my code, should I use functions?
Just a comment [that might nudge your insight] regarding functions. From the
'good-ol-days'--a function was called a subroutine. They are the same thing.
When my thinking starts to muddle (often and easily) that connection always
helps.
From the virtual desk of Lowell Tackett
--- On Wed, 4/22/09, Eduardo Vieira eduardo.su...@gmail.com wrote:
From: Eduardo Vieira eduardo.su...@gmail.com
Subject: [Tutor] Organizing my code, should I use functions?
To: tutor tutor@python.org
Date: Wednesday, April 22, 2009, 10:49 AM
Hello! I’m not a programmer and am a beginner with Python, I would
like suggestion about ways of tackling the task I had to do. I have
bee been using the xlrd package to get data from some spreadsheets
successfully.
I have developed a simple report from a script that compares number of
shipments recorded in 2 spreadsheets, with data from previous years
and current year, respectively.
Later on I was asked to include in the same report numbers from
another branch of our company. So, basically all the code logic was
the same, only two different files needed to be processed, and I
wondered how would I save time avoiding repeating code, creating extra
variables, etc. So, I simply decided to alter the code as little as
possible and use the import statement. It's working this way. Sounds
wise? I thought if I converted it to a function or a class would make
it more flexible, but my understanding of classes are too basic yet,
and am not sure if it's worth using it.
I have noticed that in lot's of python code example, people make
functions out of everything. I'm still too much attached to
procedural, not functional programming, if I understand the terms
correctly. I would appreciate any suggestions.
Here is the code:
## This script creates a report of shipments ## comparing the numbers
from the previous year with the current year.
import xlrd # Package to read Excel files import os import glob import
time import datetime import dbi import odbc
thismonth = time.strftime('%B', time.gmtime()) # Get's a string with
the name of the current month
hoje = time.strftime(%a, %b %d, %Y, time.gmtime())
# Two excel files to process with shipping information
thisyearFile = r'c:\Shipping Totals - 2009\Shipping Totals 2009 West.xls'
prevyearFile = r'c:\Shipping Totals\Shipping Totals - 2008\Shipping
Totals 2008 West.xls'
thisDay = time.gmtime()[:3]
prevyear = datetime.datetime.today() - datetime.timedelta(days=365)
aYearAgo = prevyear.timetuple()[:3]
## --- Code to find the right cell with today's shipments
book = xlrd.open_workbook(thisyearFile) # Opens excel file
dayexcel = xlrd.xldate.xldate_from_date_tuple(thisDay, book.datemode)
#Puts the date in the Excel format, like 3991.0
sh = book.sheet_by_name(thismonth) # The sheet which has the name of
the month: April, May, June, etc.
firstCol = sh.col_values(0) # Retrieves the first column
tperday = firstCol.index('TOTAL Per Day') # Finds the cell 'Total Per Day'
shipindex = tperday + 1 # The next cell after 'TOTAL Per Day', which
contains the info about shipments
# Looks for the column whose header is today's date for cols in range(sh.ncols):
for valores in sh.col_values(cols):
if valores == dayexcel: # If it finds the column with today's date
todaysList = sh.col_values(cols)
totals = sh.row_values(shipindex, end_colx=cols + 1) # sum
up to the current date
break
# Crosses rows with column to find the right cell with the shipments
of today shippedToday = todaysList[shipindex]
totalShipments = sum([a for a in totals if type(a) == type(2.0)]) #
Sums all shipments
# Check previous year's shipments processing the file with last year's data
booktwo = xlrd.open_workbook(prevyearFile)
dayexcel = xlrd.xldate.xldate_from_date_tuple(aYearAgo, book.datemode)
sh = booktwo.sheet_by_name(thismonth)
firstCol = sh.col_values(0)
tperday = firstCol.index('TOTAL Per Day')
shipindex = tperday + 1
for cols in range(sh.ncols):
for valores in sh.col_values(cols):
if valores == dayexcel:
lastyearsList = sh.col_values(cols)
totals = sh.row_values(shipindex, end_colx=cols + 1) # sum
up to the current date
break
shippedLastYear = lastyearsList[shipindex]
OldTotalShipments = sum([a for a in totals if type(a) == type(2.0)])
# Imports the information from the Eastern division. See code on the bottom
import bizreportereast as bz
report =
= Shipments Alberta Warehouse =
- Shipments today: %d
- Shipments this month: %d
- Shipments this day, last year: %d
- Shipments this month, last year: %d
= Shipments Ontario Warehouse =
- Shipments today: %d
- Shipments this month: %d
- Shipments this day, last year: %d
- Shipments this month, last year: %d
% (shippedToday, totalShipments, shippedLastYear,
OldTotalShipments, bz.shippedToday, bz.totalShipments,
bz.shippedLastYear, bz.OldTotalShipments)
print report
logfile = open('c
Re: [Tutor] Advice for my function, isPrime(n), please
From the virtual desk of Lowell Tackett --- On Sat, 7/19/08, Dick Moores [EMAIL PROTECTED] wrote: From: Dick Moores [EMAIL PROTECTED] Subject: Re: [Tutor] Advice for my function, isPrime(n), please To: Python Tutor List tutor@python.org Date: Saturday, July 19, 2008, 8:23 AM At 04:44 AM 7/19/2008, Kent Johnson wrote: On Sat, Jul 19, 2008 at 5:03 AM, Dick Moores [EMAIL PROTECTED] wrote: Readability counts. -- Personally I think my way is more readable. It says what it means without any fluff. IMO it is explicit, readable, concise and to the point. Well, readability is in the eye of the reader. Also, because I lived in Japan 30 years, I could throw a concise, explicit, and to-the-point Japanese sentence at you that you wouldn't understand at all. Yes, and then if I complained that the sentence was not readable you would rightly conclude that the problem was with the reader, not the sentence. Maybe we're running my analogy into the failure it deserves. Your basic point is that return x != 0 is standard, idiomatic Pythonese and I'm wrong to complain. I should suck it up and study harder. Point taken. I welcome this addition to my Python vocabulary. Dick Just a comment from the sidelines...this ongoing discourse, and its' humorous diversions, has been a fun read-and made some good pedagogial points-in its' own right. Always a good thing to never take ones' self too seriously, isn't it?! Thanks for the intelligent wandering from strict tutorial protocol! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Learning Python from books
Python Programming [for the absolute beginner] by Michael Dawson is-in my humble opinion-a programming pedagogical pacesetter. From the virtual desk of Lowell Tackett --- On Thu, 6/19/08, Zameer Manji [EMAIL PROTECTED] wrote: From: Zameer Manji [EMAIL PROTECTED] Subject: [Tutor] Learning Python from books To: Python Tutor mailing list tutor@python.org Date: Thursday, June 19, 2008, 2:56 PM -BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Has anyone here attempted to learn Python from books ? I recently purchased Learning Python 3rd Edition (9780596513986) and if anyone here is a good bottom-up learner than it is the perfect book. The author goes over each feature in python, explaining it's syntax, usage and the pythonic way of using them in programs. It has really helped me understand some of the more powerful tools in python and I am sure it will make an excellent reference book in the future. With that said, has anyone else attempted to learn python from books and if so which one ? -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) iQEcBAEBCgAGBQJIWqvxAAoJEA759sZQuQ1BS+kIAK+6TWqesUQjEQygwsMI3seU ZWUkd4wlextCOXIH6mse4TMHdAU3+NHDo1V4QwSYxNTEjwpWFr1Kg2BE0zyMyxPD gs8Kaov6/DGQgyFFt5DRcKvkQ0M5St7I/PuP+n/eelMUK1culvXx3oycKBqh8D21 R/g0SQ0M9pUDLuBEygbgjFw1WVsf/h8/zCc38qHQ+QOQvrVaEciV3I5JLyp3+u8g JyjzxjHSRHd4Ik4cnaeKa2OyFn5JaPXxPmrmPiE3WEWnJxLWucXAP/CEm7e9aamQ Fv4SYuVmOIGpbAqySgEpQH2yRsd+0qaNKSJq4hqjQ1/z2Bx6hM5LTqJAVjfZMW4= =9xVw -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IDE
From the virtual desk of Lowell Tackettnbsp; --- On Tue, 6/10/08, W W lt;[EMAIL PROTECTED]gt; wrote: From: W W lt;[EMAIL PROTECTED]gt; Subject: Re: [Tutor] IDE To: Sean Novak lt;[EMAIL PROTECTED]gt; Cc: tutor@python.org Date: Tuesday, June 10, 2008, 1:09 PM 1) I have two terminal windows open, one with an interactive python prompt, and the other with vim... How do you do that (as you describe above)? -Wayne ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] self-learning Python
Julia [EMAIL PROTECTED] wrote: Emad Nawfal wrote: On Sun, Mar 9, 2008 at 8:16 AM, Julia [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: To be honest I truly dislike the Dawson book. I wouldn't recommend it to anyone. It's lacks technical clarity, examples and has a messy index. I'm going to sell my example asap. I'm not sure what kind of clarity you want. To be sure Dawson is not nearly as precise and comprehensive as Learning Python, for example, but I think the more casual approach is better for a complete beginner. ISTM Dawson is written almost entirely as a series of extended examples, I'm really surprised that you say it lacks examples. Yes, Dawson uses few examples. His examples might be extensive but there are still few examples. Compare the number of examples in Dawson book to the (in my opinion better) Beginning Python by Norton (Wrox). The problem is that if you want to know how to use one specific technique then Dawsons great big examples are of limited use. In a book like Beginning Python I can find the same technique isolated and therefore better understand it. When I was a complete beginner I preferred Beginning Python over Dawson and I still do (I'm still a beginner). But that might just me be me :) /Julia There's an essential (in my opinion) principle of learning programming that doesn't seem to have made its' way into this conversation. I'll preface my thoughts by saying that in-again, my opinion- Michael Dawson's book, Python Programming for the absolute beginner is more than a book...it's a hallowed tome. A lot of learning is not only absorbing stuff, but what I call (and I'm certain it didn't originate with me) finger time. That's simply spending time at the keyboard and vicariously interacting. Things will come to you, but it needs hours and hours of fairly productive interaction. Mr. Dawson's book provides that cycle of, 'do...feedback...oh, yea!' like nothing else available. Of course, a person is gonna need to jump away and do independent stuff. But this book provides concrete milestones from which to jump and apply concepts to independently thought up projects. That, after having used Mr. Dawson's book, and appreciating the solid grounding it provided me, is my humble opinion. Lowell T. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor From the virtual desk of Lowell Tackett - Looking for last minute shopping deals? Find them fast with Yahoo! Search.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] self-learning Python
Julia [EMAIL PROTECTED] wrote: On Sun, Mar 9, 2008 at 5:00 PM, Lowell Tackett [EMAIL PROTECTED] wrote: There's an essential (in my opinion) principle of learning programming...learning is not only absorbing stuff, but what I call (and I'm certain it didn't originate with me) finger time.Mr. Dawson's book provides that cycle of, 'do...feedback...oh, yea!' like nothing else available. Of course, a person is gonna need to jump away...this book provides concrete milestones from which to jump... Lowell T. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor That was a really interesting post Lowell. Great feedback! I've thought about something like this but I haven't been sure how to express it (English isn't my mother tongue). You also set a better tone then I used in my first reply. I apologize for it. What you are talking about is very important. Succeeding and making something work is a thrill and it will motivate one try even harder the next time. For me Beginning Python provided a better ground for this learning experience because I got to try many variations of the many important parts of Python. I wrote the code from the examples and I saw it work. With Dawson there where some really extensive examples but I didn't really understand how the isolated parts worked. There where many more oh, this is cool thoughts with Beginning Python. I also believe that by using a more technical book I gained an experience with the programming methology (e.g. coding and debugging code). What I am claiming is that the productive experience is greater with Beginning Python than with Dawson. Don't be afraid of the big and more technical books. They are big, but big means there's more fun inside. /Julia Ya know what?...if we all had the same opinions and perspective, this forum wouldn't exist! We wouldn't need it (well, yea, I am kinda overlooking the pedagogical value). Actually it was [in part] your provocative comments that inspired my response (but also, I harbor very strong loyalty to Mr. Dawson's book). Please!! no apologies necessary. I am in fact inspired to look at your arguments more closely and see what valuable slant I may have boxed myself out of (sometimes, tunnel-vision tends to creep in.) From the virtual desk of Lowell Tackett - Never miss a thing. Make Yahoo your homepage.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
