Python 3 - How to write specific row in same file csv? -


i want update fieldname called "done" in same file csv

this structure of file csv:

input:

email            done  1@gmail.com         2@gmail.com         3@gmail.com  4@gmail.com

output:

email            done  1@gmail.com       1  2@gmail.com       1  3@gmail.com       1  4@gmail.com       1

what want like:

import csv open(r'e:\test.csv','r', encoding='utf-8') f:     reader = csv.dictreader(f,delimiter='|')      row in reader:       #do here#       #then write "1" filename "done" f.close()

how ? thank ! :)

with simple change use simple pair of read , write files; read line, , write out addition.

in [6]: open('test.csv','r') input:    ...:    open('test1.csv','w') output:    ...:        header=input.readline()    ...:        output.write(header)    ...:        line in input:    ...:            output.write('%s %8d\n'%(line.strip(),1))  in [7]: cat test1.csv email            done 1@gmail.com        1 2@gmail.com        1 3@gmail.com        1 4@gmail.com        1

you use csv reader , csv writer; numpy user might tempted use loadtxt , savetxt pair, though mixing string , number values in array takes bit more know-how.

in new enough python put both opens in 1 context:

with open('test.csv','r') input, open('test1.csv','w') output:     ...

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