parse a csv file into a text file

Zhen Zhang zhen.zhang.uoft at gmail.com
Thu Feb 6 09:12:37 CET 2014


On Wednesday, February 5, 2014 7:57:26 PM UTC-5, Dave Angel wrote:
> Zhen Zhang <zhen.zhang.uoft at gmail.com> Wrote in message:
> 
> > Hi, every one.
> 
> > 
> 
> > I am a second year EE student.
> 
> > I just started learning python for my project.
> 
> > 
> 
> > I intend to parse a csv file with a format like 
> 
> > 
> 
> > 3520005,"Toronto (Ont.)",C  ,F,2503281,2481494,F,F,0.9,1040597,979330,630.1763,3972.4,1
> 
> > 2466023,"Montréal (Que.)",V  ,F,1620693,1583590,T,F,2.3,787060,743204,365.1303,4438.7,2
> 
> > 5915022,"Vancouver (B.C.)",CY ,F,578041,545671,F,F,5.9,273804,253212,114.7133,5039.0,8
> 
> > 3519038,"Richmond Hill (Ont.)",T  ,F,162704,132030,F,F,23.2,53028,51000,100.8917,1612.7,28
> 
> > 
> 
> > into a text file like the following
> 
> > 
> 
> > Toronto 2503281
> 
> > Montreal 1620693
> 
> > Vancouver 578041
> 
> > 
> 
> > I am extracting the 1st and 5th column and save it into a text file.
> 
> 
> 
> Looks to me like columns 1 and 6.
> 
> 
> 
> > 
> 
> > This is what i have so far.
> 
> > 
> 
> > 
> 
> > [code]
> 
> > 
> 
> > import csv
> 
> > file = open('raw.csv')
> 
> > reader = csv.reader(file)
> 
> > 
> 
> > f = open('NicelyDone.text','w')
> 
> > 
> 
> > for line in reader:
> 
> >       f.write("%s %s"%line[1],%line[5])
> 
> 
> 
> Why not use print to file f? The approach for redirection is
> 
>  different between python 2 and 3, and you neglected to say which
> 
>  you're using. 
> 
> > 
> 
> 
> 
> > 
> 
> > My thinking is that I could add those 2 string together like c=a+' ' +b, that would give me the format i wanted.
> 
> 
> 
> And don't forget the "\n" at end of line. 
> 
> 
> 
> > So i can use f.write() to write into a file  ;) 
> 
> 
> 
> Or use print, which defaults to adding in a newline.
> 
> 
> 
> > Sorry if my questions sounds too easy or stupid.
> 
> > 
> 
> 
> 
> Not in the least.
> 
> 
> 
> > 
> 
> > 
> 
> 
> 
> 
> 
> -- 
> 
> DaveA

Hi Dave  Thanks for the reply,
I am currently running python 2.7.

Yes, i thought there must be a print function in python like fprint in C++ that allows you to print into a file directly.
But i google about "print string into text file" I got answers using f.write() instead. :)



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