I'm using this code to generate short url. http://code.activestate.com/recipes/576918/
The idea is to encode an integer id using base62 and function enbase just works fine.
class UrlEncoder(object):
...
def enbase(self, x, min_length=0):
result = self._enbase(x)
padding = self.alphabet[0] * (min_length - len(result))
return '%s%s' % (padding, result)
But I don't quite understand what this code is for:
class UrlEncoder(object):
...
def encode_url(self, n, min_length=0):
return self.enbase(self.encode(n), min_length)
def decode_url(self, n):
return self.decode(self.debase(n))
def encode(self, n):
return (n & ~self.mask) | self._encode(n & self.mask)
Why encode then enbase? What does that bitwise operation do? Could someone shed some light on me? Thanks.
self.mask? Could you show the_encodefunction? – Karl Knechtel 2 hours ago