urledit 1.1.0

>>> urledit(url)(scheme='http')(netloc='host.com')(fragment=''
... ).param(s=None).param(a=1).param(b=['x', 'y', 'z']).join()
'http://host.com/forum/showthread.php?p=728386&a=1&b=x&b=y&b=z'

>>> urledit(url, scheme='http', netloc='host.com', fragment=''
... ).param(('s', None), ('a', 1), b=['x', 'y', 'z']).join()
'http://host.com/forum/showthread.php?p=728386&a=1&b=x&b=y&b=z'

>>> u = urledit(url)
>>> u.scheme, u.netloc, u.path, u.qs, u.fragment
('', '', 'forum/showthread.php', 's=12345&p=728386', 'post728386')

>>> u.scheme, u.netloc, u.fragment = 'http', 'host.com', ''
>>> u.join()
'http://host.com/forum/showthread.php?s=12345&p=728386'

>>> u.query == {'p': '728386', 's': '12345'}
True

>>> del u.query['s']
>>> u.join()
'http://host.com/forum/showthread.php?p=728386'

>>> u.query['a'] = 1
>>> u.query['b'] = ['x', 'y', 'z']
>>> u.join()
'http://host.com/forum/showthread.php?p=728386&a=1&b=x&b=y&b=z'