a couple of newbie questions
Nick Vargish
nav at adams.patriot.net
Fri Mar 21 13:26:33 EST 2003
"Joseph Paish" <jpaish at freenet.edmonton.ab.ca> writes:
> 1. is there a way to comment out a large block of code in python?
> the reason i ask is that i would like to comment out the entire perl
> script and convert it piece by piece into python, uncommenting each
> function as it is converted so i can test if it does what i want.
Put a '#' in front of each line...
#!/usr/bin/env python
import sys
print '\n# '.join(sys.stdin.read().split('\n'))
You'll get an extra line at the end, and no extra "#" on the first
line. Fixing it is left as an excercise (I love saying that).
> 2. is there a way to read a datafile whose records are space
> separated so that the second field becomes the key to a dictionary
> and the value portion is the entire record. for example,
> 01/01/2003 abc 1234.56 789.98 12332.98 <<< the original record
datadict = {}
datafile = open(myfile, 'r')
for dataline in datafile.xreadlines():
datadict[dataline.split(' ')[1]] = dataline
That should do the trick...
> i have managed to read the datafile into a list of lists and would
[ ... ]
> how to convert a list of lists into dictionaries.
Overkill... I think you're working it too hard.
> an alternative would be to bypass the list of lists altogether and
> populate the dictionary as i read each record. this would be even
> simpler.
Indeed, see the above example (two lines, not counting initialization).
Hope that helps,
Nick
--
#include<stdio.h> /* SigMask 0.3 (sig.c) 19990429 PUBLIC DOMAIN "Compile Me" */
int main(c,v)char *v;{return !c?putchar(*v-1)&&main(0,v+ /* Tweaks welcomed. */
1):main(0,"Ojdl!Wbshjti!=obwAqbusjpu/ofu?\v\1");} /* build: cc -o sig sig.c */
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