parsing file in python -


i'm trying parse 2 pipe/comma separated files , if particular field matches in file create new entry in 3rd file.

code follows: 

#! /usr/bin/python  fo = open("c-1.txt" , "r" ) line in fo:     #print line     fields = line.split('|')     src  = fields[0]      f1 = open("airport.txt", 'r')     f2 = open("b.txt", "a")     #with open('c.csv', 'r') f1:     #    line1 = f1.read()     line1 in f1:         reader = line1.split(',')         hi = false         target = reader[0]         if target == src , fields[1] == 'zht':             print target             hi = true             f2.write(fields[0])             f2.write("|")             f2.write(fields[1])             f2.write("|")             f2.write(fields[2])             f2.write("|")             f2.write(fields[3])             f2.write("|")             f2.write(fields[4])             f2.write("|")             f2.write(fields[5])             f2.write("|")             f2.write(reader[2])     if hi == false:          f2.write(line)     f2.close()     f1.close() fo.close()

the matching field gets printed 2 times in new file. reason?

the problem seems reset hi false in each iteration of loop. lets second line matches, third not. set hi true in second line, false again in third, , print original line.

try this:

hi = false line1 in f1:     reader = line1.split(',')     target = reader[0]     if target == src , fields[1] == 'zht':         hi = true         f2.write(stuff) if hi == false:      f2.write(line)

or, assuming 1 line ever match, use for/else:

for line1 in f1:     reader = line1.split(',')     target = reader[0]     if target == src , fields[1] == 'zht':         f2.write(stuff)         break else:      f2.write(line)

also note replace series of f2.write statements one, joining several parts |:

f2.write('|'.join(fields[0:6] + [reader[2]])

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