def get_mx_address()

in roundtrip.py [0:0]

• 12 lines of code
• 4 McCabe index (conditional complexity)

def get_mx_address(email):
    """ Turn an email address into an MX hostname """
    domain = email.split('@')[1]
    exchanges = []
    try:
        for x in dns.resolver.resolve(domain, 'MX'):
            exchanges.append(x.exchange.to_text().rstrip('.'))
    except dns.resolver.NoAnswer:
        pass
    if not exchanges:
        exchanges.append(domain)
    random.shuffle(exchanges)
    return exchanges[0]