import mechanize
b = mechanize.Browser()
b.open(...)

b['city'] = 'San Francisco'
b['state'] = 'CA'
assert b['voice']
b.submit()

import BeautifulSoup
soup = BeautifulSoup.BeautifulSoup(b.response())

print soup('a')
print soup('a', href=re.compile('.*wav'))
b.open(relative link works okay)