Format brazilian phone numbers

gistfile1.py

def formatPhone(phone):
    formatted = ''
    i = 0

    # clean phone. skip not digits
    phone = ''.join(x for x in phone if x.isdigit())

    # set pattern
    if len(phone) == 12:
        pattern = '(XXX) XXXXX-XXXX'
    elif len(phone) == 11:
        pattern = '(XXX) XXXX-XXXX'
    elif len(phone) == 9:
        pattern = 'XXXXX-XXXX'
    elif len(phone) == 8:
        pattern = 'XXXX-XXXX'
    else:
        pattern = 'XXXXXXXXXXXXXXXXXXXX'

    # reverse
    phone = phone[::-1]
    pattern = pattern[::-1]

    # scan pattern
    for p in pattern:
        # skip non X
        if p != 'X':
            formatted += p
            continue        

        try:
            # add phone digit
            formatted += phone[i]
            i += 1
        except IndexError:
            break

    # reverse again    
    formatted = formatted[::-1]

    return formatted