Format an un-decorated phone number in django?

Question

I\'ve got a DB chock full o\' phone numbers as strings, they\'re all formatted like 1112223333, I\'d like to display it as 111-222-3333 in my django template

I know

Answer 1

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) > 10:
        pattern = 'X (XXX) XXX-XX-XX'
    else:
        pattern = 'XXX-XXX-XX-XX'

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

    # scan pattern
    for p in pattern:
        if i >= len(phone):
            break

        # skip non X
        if p != 'X':
            formatted += p
            continue        

        # add phone digit
        formatted += phone[i]
        i += 1

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

    return formatted

print formatPhone('+7-111-222-33-44')

7 (111) 222-33-44

print formatPhone('222-33-44')

222-33-44

print formatPhone('23344')

2-33-44