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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: parse a csv file into a text file
Date: Wed, 05 Feb 2014 22:01:06 -0500
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On 2/5/2014 7:10 PM, Zhen Zhang wrote:
> 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,0.9,1040597,979330,6=
30.1763,3972.4,1
> 2466023,"Montr=C3=A9al (Que.)",V  ,F,1620693,1583590,T,F,2.3,787060,743=
204,365.1303,4438.7,2
> 5915022,"Vancouver (B.C.)",CY ,F,578041,545671,F,F,5.9,273804,253212,11=
4.7133,5039.0,8
> 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.
>
> This is what i have so far.
>
>
> [code]
>
> import csv
> file =3D open('raw.csv')
> reader =3D csv.reader(file)
>
> f =3D open('NicelyDone.text','w')
>
> for line in reader:
>        f.write("%s %s"%line[1],%line[5])
   f.write("%s %s\n" % (line[1], line[5])) should do better.
>
> [/code]
>
> This is not working for me,

Always say how something is not working. If there is a traceback, cut=20
and paste after reading it carefully.


  I was able to extract the data from the csv file as line[1],line[5].=20
(I am able to print it out)
> But I dont know how to write it to a .text file in the format i wanted.=

>
> Also, I have to process the first column eg, "Toronto (Ont.)" into "Tor=
onto".
> I am familiar with the function find(), I assume that i could extract T=
oronto out of Toronto(Ont.) using "(" as the stopping character,
> but based on my research , I have no idea how to use it and ask it to r=
eturn me the string(Toronto).
>
> Here is my question:
> 1:What is the data format for line[1], if it is string how come f.write=
()does not work. if it is not string, how do i convert it to a string?
> 2:How do i extract the word Toronto out of Toronto(Ont) into a string f=
orm using find() or other methods.
>
> My thinking is that I could add those 2 string together like c=3Da+' ' =
+b, that would give me the format i wanted.
> So i can use f.write() to write into a file  ;)
>
> Sorry if my questions sounds too easy or stupid.
>
> Thanks ahead
>
> Zhen
>


--=20
Terry Jan Reedy