pool.py

class KyotoTycoon(object):
    ...
    def get(self, key):
        with self.pool.context() as c:
            return c.get(key, db=self.db)


class ConnectionPool(object):
    ...
    def context(self):
        return ConnectionGuard(self)


class ConnectionGuard(object):
    def __init__(self, pool):
        self.pool = pool

    def __enter__(self):
        self.connection = self.pool.acquire()
        return self.connection

    def __exit__(self, exc_type, exc_value, traceback):
        if exc_type is None:
            self.pool.release(self.connection)
        else:
            if self.connection.exc_types and any(
                    isinstance(exc_value, exc_type) for exc_type in self.connection.exc_types):
                self.pool.abandon(self.connection)
            else:
                self.pool.release(self.connection)
            return False

Looks good.