Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #103183
| Newsgroups | comp.lang.python |
|---|---|
| Date | 2016-02-19 03:11 -0800 |
| References | <90cc50d2-1ce5-4588-9bfd-a49d439f00dd@googlegroups.com> <mailman.1.1455804461.2289.python-list@python.org> <f15c6212-6007-4d21-abc8-026688f99331@googlegroups.com> <56c66aa9$0$1598$c3e8da3$5496439d@news.astraweb.com> |
| Message-ID | <8c67cb1c-4318-4d3b-b425-da894e5138e4@googlegroups.com> (permalink) |
| Subject | Re: Considering migrating to Python from Visual Basic 6 for engineering applications |
| From | wrong.address.1@gmail.com |
On Friday, 19 February 2016 03:06:58 UTC+2, Steven D'Aprano wrote:
> On Fri, 19 Feb 2016 02:35 am, wrong.address.1@gmail.com wrote:
>
> > I am almost eager to do this but want to be sure that I know the pitfalls
> > in using Python for my purposes. Thanks for your encouraging response.
>
> Honestly "wrong.address.1", the ONLY pitfall you need to be aware of is to
> beware of trying to write VB code using Python's interpreter. Python has
> it's own way of doing things, and if you insist on doing them "just like
> VB" you will end up with horrible, slow, inefficient, unusable code.
This I am aware of. And it is not a problem.
> That's
> not to say that VB is worse, or Python is worse, just that they are
> different. You don't use a hammer the same was a screwdriver.
>
> Python is a 20+ year old language used by millions of professionals all over
> the world for everything from quick scripting, scientific computing, web
> applications, long-running server applications, and everything in between.
> The answer to every one of your questions "Can Python do X?" will be one
> of:
>
> (1) Yes it can.
>
> (2) No, but instead it will do Y which gives you the same result.
>
>
> I'll be frank, to come here and ask a bunch of questions like:
>
> "Is it necessary to read one character at a time...?"
>
> is a little bit rude. I don't want to discourage you from asking questions,
> but think about *how* you ask them. What you're doing is a little bit like
> going to a car dealer, looking at the cars, then asking a bunch of
> questions:
No, I first saw this trouble in VB.net. Later I found there was an input command which allowed me to read numbers in varying formats more or less like in Fortran or Basic. I really hope Python has decent ways of reading numeric data which may not follow regular formats.
>
> "So... does this car have a reverse gear or can it only go forward? Do the
> doors open for entry, or do I have to squeeze through the windows? Can I
> use the radio while driving, or is there only enough power for one at a
> time?"
>
> In most programming communities, if you start asking questions like that,
> you can expect to be ignored or abused. Good thing we're a friendly
> bunch :-)
I hope it was not rude. At least I did not mean to be.
>
>
> Instead, a good question is:
>
> "How do I read a bunch of numbers from a text file?"
>
>
> I'll show you, not only how to read a bunch of numbers, but how to write
> them first.
>
> Of course there are a million different ways you can do this, and for
> serious use you will probably want to use something like a CSV (Comma
> Separated Values) file like Excel produces, but for a quick idea of how
> Python works, let's write some numbers to a file, one per line. Comments
> start with # and have no effect. Remember that indentation is meaningful:
> you must use the same number of spaces as shown in my code.
>
> Copy and paste this code into the Python interpreter:
>
>
>
> # ===== cut =====
>
> # Define some numbers.
> numbers = [1, 45, 38, 99, 1002, 83025, 234, 55, 273, 2]
> # Open a file for writing.
> with open("myfile.txt", "w") as f:
> # Write each number to the file, one per line.
> for number in numbers:
> print("Writing %d to the file." % number)
> f.write(str(number) + "\n")
>
> # ===== cut =====
>
>
>
> And that's done. Five lines of code, ignoring comments. Now let's read them
> back and see if they're the same:
>
>
> # ===== cut =====
>
> # Prepare a list to hold the numbers.
> data = []
> # Open a file for reading.
> with open("myfile.txt", "r") as f:
> # Read each line.
> for line in f:
> value = line.strip() # Get rid of trailing newline.
> print("Read %s from the file." % value)
> data.append(int(value))
>
I have not yet learnt any Python so I do not understand almost anything. Besides, I will have to read data given to me by people, which may not come in nice formats like CSV, or pre-written by Python.
> # Confirm the numbers read in are the same as those written out.
> if data != numbers:
> print("mismatch in values")
>
> # Print the sorted values.
> print(sorted(data))
>
> # ===== cut =====
>
>
>
> Does this help?
>
Yes. Thanks for your response. I am clear about that I will have to think in a different way and not try to convert VB to Python line by line.
>
>
> --
> Steven
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-17 11:49 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications sohcahtoa82@gmail.com - 2016-02-17 12:25 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-02-17 20:54 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Ray Cote <rgacote@appropriatesolutions.com> - 2016-02-17 16:13 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications paul.hermeneutic@gmail.com - 2016-02-17 14:18 -0700
Re: Considering migrating to Python from Visual Basic 6 for engineering applications William Ray Wing <wrw@mac.com> - 2016-02-17 16:27 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 00:17 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-02-18 10:09 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-18 21:16 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 03:11 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-18 22:32 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 07:49 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-19 03:06 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 09:49 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dietmar Schwertberger <maillist@schwertberger.de> - 2016-02-18 21:37 +0100
RE: Considering migrating to Python from Visual Basic 6 for engineering applications Dan Strohl <D.Strohl@F5.com> - 2016-02-18 16:24 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 09:58 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Tim Chase <python.list@tim.thechases.com> - 2016-02-18 13:18 -0600
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-19 11:30 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-19 11:57 +1100
Ohnoes significant whitespace (was: Considering migrating to Python from Visual Basic 6 for engineering applications) Ben Finney <ben+python@benfinney.id.au> - 2016-02-19 12:03 +1100
Re: Ohnoes significant whitespace Marko Rauhamaa <marko@pacujo.net> - 2016-02-19 08:36 +0200
Re: Ohnoes significant whitespace (was: Considering migrating to Python from Visual Basic 6 for engineering applications) Grant Edwards <invalid@invalid.invalid> - 2016-02-19 14:57 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-19 02:14 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-19 21:18 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-02-18 15:20 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 07:33 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-02-18 15:47 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications William Ray Wing <wrw@mac.com> - 2016-02-18 10:59 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 09:38 -0800
RE: Considering migrating to Python from Visual Basic 6 for engineering applications Dan Strohl <D.Strohl@F5.com> - 2016-02-18 16:00 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 09:44 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Tim Chase <python.list@tim.thechases.com> - 2016-02-18 13:28 -0600
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-19 02:47 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-02-19 11:23 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-19 03:53 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-02-19 08:13 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-20 18:54 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-20 10:45 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Christian Gollwitzer <auriocus@gmx.de> - 2016-02-20 20:21 +0100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Tony van der Hoff <tony@vanderhoff.org> - 2016-02-19 11:34 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Tim Chase <python.list@tim.thechases.com> - 2016-02-19 07:40 -0600
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-19 10:14 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-19 23:06 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Larry Hudson <orgnut@yahoo.com> - 2016-02-19 23:49 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-20 10:38 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Larry Hudson <orgnut@yahoo.com> - 2016-02-20 23:28 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-21 13:16 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-22 00:54 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-21 17:08 +0200
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-21 16:16 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-21 23:52 +0200
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-21 23:05 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-22 10:50 +0200
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-22 12:24 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-02-21 21:19 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-22 21:46 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-22 13:39 +0200
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Random832 <random832@fastmail.com> - 2016-02-22 09:49 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-22 16:21 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-02-23 10:45 +1300
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Christian Gollwitzer <auriocus@gmx.de> - 2016-02-21 16:21 +0100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Tim Chase <python.list@tim.thechases.com> - 2016-02-21 12:19 -0600
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-02-21 21:40 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-22 22:16 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-22 12:51 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-23 00:09 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-02-21 13:39 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Peter Otten <__peter__@web.de> - 2016-02-19 15:58 +0100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Matt Wheeler <m@funkyhat.org> - 2016-02-19 17:05 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Roel Schroeven <roel@roelschroeven.net> - 2016-02-20 23:28 +0100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-02-19 01:07 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wxjmfauth@gmail.com - 2016-02-18 01:49 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications William Ray Wing <wrw@mac.com> - 2016-02-18 09:07 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-18 07:35 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-19 12:06 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-19 03:11 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-02-19 08:27 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Steven D'Aprano <steve@pearwood.info> - 2016-02-20 12:13 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications William Ray Wing <wrw@mac.com> - 2016-02-19 22:28 -0500
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-19 15:34 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-20 02:43 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Grant Edwards <invalid@invalid.invalid> - 2016-02-19 16:04 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Grant Edwards <invalid@invalid.invalid> - 2016-02-19 15:59 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications BartC <bc@freeuk.com> - 2016-02-19 16:32 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Chris Angelico <rosuav@gmail.com> - 2016-02-20 03:49 +1100
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Grant Edwards <invalid@invalid.invalid> - 2016-02-19 18:03 +0000
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Denis Akhiyarov <denis.akhiyarov@gmail.com> - 2016-02-19 20:58 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-20 10:50 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Denis Akhiyarov <denis.akhiyarov@gmail.com> - 2016-02-22 00:02 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications Mike S <mscir@yahoo.com> - 2016-02-20 19:52 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wxjmfauth@gmail.com - 2016-02-20 01:46 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications nholtz <nholtz@cee.carleton.ca> - 2016-02-20 08:22 -0800
Re: Considering migrating to Python from Visual Basic 6 for engineering applications wrong.address.1@gmail.com - 2016-02-20 10:47 -0800
csiph-web