Python script for cleaning a csv based on a ban list. (Used to clean big email lists)

email.py

import csv, sys, random

# num = qtd de emails a escolher
num = 40000

csv_file = "lista.csv"
out_file = "output.csv"

email_list = list(csv.reader(open(csv_file, 'r')))

result = []

for i in range(int(num)):
	result.append(email_list.pop(random.choice(range(len(email_list)))))

with open(out_file, "wb") as f:
    writer = csv.writer(f)
    writer.writerows(result)

with open(csv_file, "wb") as f:
    writer = csv.writer(f)
    writer.writerows(email_list)