Python program for changing the delimiter of a CSV file

convert_delimiter.py

import re, sys

input_file ="input.csv"
output_file ="output.csv"
input_file_delimiter = ';'
output_file_delimiter = ','

output = []
with open(input_file) as f_input:
    lines = f_input.read().splitlines()

    for each_line in lines:
        output.append(re.sub(input_file_delimiter, output_file_delimiter, each_line))

with open(output_file, 'w') as f_output:
    for each in output:
        f_output.write(each + '\n')