Backup SIM card contacts to a CSV file

contacts-backup.py

#!/usr/bin/python

import io

dev = "/dev/ttyUSB1" # Replace this if necessary

cmd,data = io.open(dev, "w"), io.open(dev, "r")
cmd.write(u"AT+CPBR=?\n")

min_id, max_id = -1, -1

buffer = ""
while data.readable():
    b = data.readline()
    if b == "OK\n":
        break
    if b[:6] == "+CPBR:":
        min_id, max_id = map(lambda x: int(x), b[6:].split(",")[0].strip(" ()").split("-"))

from time import sleep
for i in range(min_id, max_id+1):
    cmd.write(u"AT+CPBR=%d\n" % i)
    while data.readable():
        b = data.readline()
        if b == "OK\n":
            break
        elif b == "+CME ERROR: not found\n":
            exit()
        else:
            if b[:6] == "+CPBR:":
                buffer = b[:-1].split(",")
                print buffer[3], ",", buffer[1]
    sleep(0.1)