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Re: My first ever Python program, comments welcome

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On 21/07/2012 20:08, Lipska the Kat wrote:
> Greetings Pythoners
>
> A short while back I posted a message that described a task I had set
> myself. I wanted to implement the following bash shell script in Python
>
> Here's the script
>
> sort -nr $1 | head -${2:-10}
>
> this script takes a filename and an optional number of lines to display
> and sorts the lines in numerical order, printing them to standard out.
> if no optional number of lines are input the script prints 10 lines
>
> Here's the file.
>
> 50	Parrots
> 12	Storage Jars
> 6	Lemon Currys
> 2	Pythons
> 14	Spam Fritters
> 23	Flying Circuses
> 1	Meaning Of Life
> 123	Holy Grails
> 76	Secret Policemans Balls
> 8	Something Completely Differents
> 12	Lives of Brian
> 49	Spatulas
>
>
> ... and here's my very first attempt at a Python program
> I'd be interested to know what you think, you can't hurt my feelings
> just be brutal (but fair). There is very little error checking as you
> can see and I'm sure you can crash the program easily.
> 'Better' implementations most welcome
>
> #! /usr/bin/env python3.2
>
> import fileinput
> from sys import argv
> from operator import itemgetter
>
> l=[]
> t = tuple
What's the purpose of this line?

> filename=argv[1]
> lineCount=10
>
> with fileinput.input(files=(filename)) as f:
> 	for line in f:
> 		t=(line.split('\t'))
> 		t[0]=int(t[0])
> 		l.append(t)
> 	l=sorted(l, key=itemgetter(0))
Short is:

     l.sort(key=itemgetter(0))

>
> 	try:	
> 		inCount = int(argv[2])
> 		lineCount = inCount
You may as well say:

     lineCount = int(argv[2])

> 	except IndexError:
> 		#just catch the error and continue		
> 		None
The do-nothing statement is:

     pass

>
> 	for c in range(lineCount):
> 		t=l[c]
If there are fewer than 'lineCount' lines, this will raise IndexError.
You could do this instead:

     for t in l[ : lineCount]:

> 		print(t[0], t[1], sep='\t', end='')
>

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My first ever Python program, comments welcome Lipska the Kat <lipska@lipskathekat.com> - 2012-07-21 20:08 +0100
  Re: My first ever Python program, comments welcome Ian Foote <ian@feete.org> - 2012-07-21 20:34 +0100
  Re: My first ever Python program, comments welcome MRAB <python@mrabarnett.plus.com> - 2012-07-21 20:40 +0100
    Re: My first ever Python program, comments welcome Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-22 00:32 +0000
      Re: My first ever Python program, comments welcome MRAB <python@mrabarnett.plus.com> - 2012-07-22 02:56 +0100
      Re: My first ever Python program, comments welcome Chris Angelico <rosuav@gmail.com> - 2012-07-22 11:59 +1000
      Re: My first ever Python program, comments welcome Dave Angel <d@davea.name> - 2012-07-21 22:01 -0400
  Re: My first ever Python program, comments welcome Dave Angel <d@davea.name> - 2012-07-21 16:10 -0400
    Re: My first ever Python program, comments welcome Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-22 00:56 +0000
    Re: My first ever Python program, comments welcome rusi <rustompmody@gmail.com> - 2012-07-21 19:55 -0700
      Re: My first ever Python program, comments welcome Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-07-22 09:14 +0100
      Re: My first ever Python program, comments welcome Lipska the Kat <lipska@lipskathekat.com> - 2012-07-22 10:20 +0100
        Re: My first ever Python program, comments welcome rusi <rustompmody@gmail.com> - 2012-07-22 09:18 -0700
          Re: My first ever Python program, comments welcome Lipska the Kat <lipska@lipskathekat.com> - 2012-07-22 18:23 +0100
            Re: My first ever Python program, comments welcome rusi <rustompmody@gmail.com> - 2012-07-23 22:13 -0700
              Re: My first ever Python program, comments welcome Lipska the Kat <lipskathekat@yahoo.co.uk> - 2012-07-24 12:34 +0100
    Re: My first ever Python program, comments welcome Lipska the Kat <lipska@lipskathekat.com> - 2012-07-22 09:37 +0100
      Re: My first ever Python program, comments welcome Andrew Berg <bahamutzero8825@gmail.com> - 2012-07-22 03:49 -0500
      Re: My first ever Python program, comments welcome Chris Angelico <rosuav@gmail.com> - 2012-07-22 20:17 +1000
        Re: My first ever Python program, comments welcome Lipska the Kat <lipska@lipskathekat.com> - 2012-07-22 13:36 +0100
      Re: My first ever Python program, comments welcome David <bouncingcats@gmail.com> - 2012-07-22 20:46 +1000
  Re: My first ever Python program, comments welcome Peter Otten <__peter__@web.de> - 2012-07-22 09:56 +0200
  Re: My first ever Python program, comments welcome "Ivan@work" <ivan.cvetkovic@pakel.hr> - 2012-07-23 09:12 +0200

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