DataJoy mini bug with __builtin__

code

class llist(__builtin__.list):
    """Special list for Ordered Models. Element -1 is -Inf, Final element is Inf.

    --------------------------------------------------------
    EXAMPLE:
    x = llist([12.,14,2.2])
    x[1]
    >>>14
    x[-1], x[3]
    >>>(-inf, inf)
    x[-2]
    >>>IndexError: Not supported index -2 was called.
    """

    def __getitem__(self, l):
        if   l == -1:
            return -np.inf
        elif l == len(self):
            return np.inf
        elif l < -1 or l > len(self):
            raise IndexError, "Not supported index %i was called."%l
        else:
            return super(llist,self).__getitem__(l)

error

Traceback (most recent call last):
  File "CNOP.py", line 13, in <module>
    class llist(__builtin__.list):
NameError: name '__builtin__' is not defined