Formats phone numbers

contact_formatter.py

import os

filename = "mv17.csv"
phone_column = 2

with open(os.path.join(".", filename), "r") as f:
    new_lines = []

    for i, l in enumerate(f.readlines()):
        if i == 0:
            new_lines.append(l)
            continue
        elems = l.split(",")

        phoneno = elems[phone_column].replace(" ", "")

        if len(phoneno) == 8 and "+" not in phoneno:
            phoneno = phoneno[:3] + " " + phoneno[3:5] + " " + phoneno[5:]
            phoneno = "+47 " + phoneno

        elems[phone_column] = phoneno

        new_lines.append(",".join(elems))

with open(os.path.join(".", "new_" + filename), "w") as g:
    g.writelines(new_lines)