def __init__(self, db, limit, key, last=None, next=None, level=<NUM_LIT:0.0>):
self.db = db<EOL>self.limit = limit<EOL>self.key = key<EOL>self.last = last<EOL>self.next = next<EOL>self.level = level<EOL>
Initialize a bucket.

:param db: The database the bucket is in.
:param limit: The limit associated with this bucket.
:param key: The key under which this bucket should be stored.
:param last: The timestamp of the last request.
:param next: The timestamp of the next permissible request.
:param level: The current water level in the bucket.