[Tutor] Parsing Question

[Emile van Sebille]

On 5/9/2009 5:30 PM Alan Gauld said...

> You should probably be able to do the first for loop as a list
> comprehension,  but I can't think of how to get the split() call
> embedded into it right now!
>

Just for fun -- given datafile contents...

1 one 2 two
3 three 4 four
5 five 6 six
7 seven 8 eight
9 nine 10 ten
11 eleven 12 twelve

... here's a single list comprehension answer

[ v for k,v in sorted(
   dict ( (int(pair[0]),pair[1])
     for pairs in [ dataline.split()
       for dataline in open(r'c:\datafile').readlines() if dataline ]
         for pair in (pairs[:2], pairs[2:4]) ).items() )]


['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 
'ten', 'eleven', 'twelve']

Emile