Thanks again, it works perfectly. I made a small change by adding: a = (a.rstrip('\n'))
f = open('Output.CSV','w')
for a,b in zip(open('1.CSV'),open('2.CSV')):
a = (a.rstrip('\n'))
f.write(a+','+b)
I stripped the newline character from the first CSV file because it was pushing the 2nd...