RE: python examples
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Sun, 7 Dec 2008 18:22:20 -0500
Nick I can't grab your email from the to field can you drop me a line in
email I have something off list I would like to ask you.
kperry@xxxxxxxxxxxxx
Ken
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Nick Stockton
Sent: Sunday, December 07, 2008 2:46 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: python examples
$ # Lets run the python interpreter.
$ python
Python 2.5.2 (r252:60911, Nov 14 2008, 19:46:32)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>># To join a line you use the ';' character.
>>> print "Hello world!";print "My name is Nick."
Hello world!
My name is Nick.
>>># To split an expression over multiple lines you use the '\' character.
>>> sum\
... =\
... 1\
... +\
... 2
>>> print \
... sum
3
>>># As a side note, I could have just typed 'print 1+2' and gotten 3.
>>> quit()
$ # Now for a final example I will use python to print the title on the
google home page.
$ # There are several ways I could have done this but I chose to use the
BeautifulSoup module.
$ # Here is the code.
$ cat print_google_site_title.py
import urllib
from BeautifulSoup import BeautifulSoup
data = BeautifulSoup(urllib.urlopen("http://www.google.com";))
print data.title.string
$ # Now I will run the code to make sure it works.
$ python print_google_site_title.py
Google
$
Nick Stockton
----- Original Message -----
From: "Octavian Rasnita" <orasnita@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Sunday, December 07, 2008 12:41 PM
Subject: Re: ewby on programming need some tips and tricks
> From: "Nick Stockton" <nstockton@xxxxxxxxx>
>> """
>> In perl you can write the entire program in a single line. You can even
>> write the program in the command line. Can you do that with python?
>> """
>>
>> Yes you can do boath with python.
>
> Can you give an example?
> Here is a very simple example of a command line that downloads the first
> page of Google and prints the title of that page:
>
> perl -MLWP::Simple -e "$p=get('http://www.google.com/');
> ($t)=$p=~/<title>(.+?)<\/title>/gsi; print $t;"
>
> It would be very interesting, especially for those who like python to see
> how it could be done with python, and I would be also very interested,
> because it could convince me easier that python has real advantages.
>
>> You asked:
>> """
>> In perl you can split an expression on more lines and it will work. Can
>> you do the same thing with python?
>> """
>>
>> yes you can do that with python.
>
> Can you give an example?
>
> Here is a simple math operation that is easy to understand in perl, of
> course very exagerated to see how flexible are some languages:
>
> my
> $
> variable
> =
> 1
> +
> 2
> ;
>
> print
> $
> variable
> ;
>
> This will print of course "3".
>
>>
>> You stated:
>> """
>> In perl you can indent the code with more or less spaces, whatever you
>> like, or you can not indent the code at all. But you can't do that with
>> python.
>> """
>>
>> in python you can indent the code with more or less spaces as well even
>> just one space as long as you indent. I tend to use four spaces as for
>> me, anything more is to many and anything less is to few.
>
> I think you didn't understand what I said.
> In python you should keep a consistent indenting and if you indent a line
> with a space, you should indent all other lines in the same block with a
> space, because if it happends to indent them with 2 or more spaces, the
> program won't be very happy.
>
>> Also in another message you asked:
>> """
>> If python wouldn't have this issue of indentation, it wouldn't need
>> workarounds for making it a little bit friendlier.
>> So I don't understand what you don't like when I said that python is less
>> friendly for the blind than other languages.
>> """
>>
>> Because most languages and programs in general for that matter to one
>> extent or another can be a little unfriendly and require workarounds. I
>> mentioned visual studio in my last message. Do you think it would be
>> very
>> accessible with out the screen reader scripts for it? The screen reader
>> scripts and learning all the hotkeys for them are probably even bigger
>> workarounds then adding a couple commented braces in python code. I
>> don't
>> use VS so someone else will have to confirm that but I do define screen
>> reader scripts as
>
> Yes of course you are right. That's one of the reasons I don't use Visual
> Studio too much. :-)
>
>> workarounds. Now lets say you use the console to compile and you get
>> some
>> output that scrolls off the screen. As far as I know it's quite hard for
>> a blind user to use the cmd scrollback buffer and so What do you do? You
>> pipe the output to a text file and read it with a text editor or pipe it
>> directly to a program for reading even though it might be a bit
>> inconvenient to do. Pipes are workarounds too.
>
> Yes pipes are workarounds too, because you need to make an effort each
> time
> you need to do the pipes.
> But I have defined a shortcut in TextPad to run a certain program with the
> current program as a parameter, so if I want to compile the program I am
> currently developing, I just press the hot key I defined, then press
> enter,
> or I could also add some command line parameters before pressing enter.
> But this is not special to perl or other languages, because I can use the
> same technique with python, or ruby, or C#, or Java...
>
> And the result from STDERR or STDOUT will be printed as another common
> document window, which would be very accessible no matter if it has 3
> lines or 100 MB.
>
> Octavian
>
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