fastest way convert tab-delimited file to csv in linux

Question

I have a tab-delimited file that has over 200 million lines. What\'s the fastest way in linux to convert this to a csv file? This file does have multiple lines of header i

Answer 1

@ignacio-vazquez-abrams 's python solution is great! For people who are looking to parse delimiters other tab, the library actually allows you to set arbitrary delimiter. Here is my modified version to handle pipe-delimited files:

import sys
import csv

pipein = csv.reader(sys.stdin, delimiter='|')
commaout = csv.writer(sys.stdout, dialect=csv.excel)
for row in pipein:
  commaout.writerow(row)