# passo1_importar aequivo csv com as mensagens dos clientes
import csv


arquivo = open('base.csv')

base = csv.reader(arquivo)
for base in base:
    print(base)



import re
base = re.sub(u'[^a-zA-Z0-9áéíóúÁÉÍÓÚâêîôÂÊÎÔãõÃÕçÇ: ]', '', string_velha.decode('utf-8'))