parse a csv file into a text file
tjreedy at udel.edu
Thu Feb 6 04:01:06 CET 2014
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,0.9,1040597,979330,630.1763,3972.4,1
> 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.
> This is what i have so far.
> import csv
> file = open('raw.csv')
> reader = csv.reader(file)
> f = open('NicelyDone.text','w')
> for line in reader:
> f.write("%s %s"%line,%line)
f.write("%s %s\n" % (line, line)) should do better.
> This is not working for me,
Always say how something is not working. If there is a traceback, cut
and paste after reading it carefully.
I was able to extract the data from the csv file as line,line.
(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 "Toronto".
> I am familiar with the function find(), I assume that i could extract Toronto 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 return me the string(Toronto).
> Here is my question:
> 1:What is the data format for line, 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 form using find() or other methods.
> My thinking is that I could add those 2 string together like c=a+' ' +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
Terry Jan Reedy
More information about the Python-list