def astype(self, dtype, copy=True):
return np.array(self, dtype=dtype, copy=copy)<EOL>
Cast to a NumPy array with 'dtype'.

Parameters
----------
dtype : str or dtype
    Typecode or data-type to which the array is cast.
copy : bool, default True
    Whether to copy the data, even if not necessary. If False,
    a copy is made only if the old dtype does not match the
    new dtype.

Returns
-------
array : ndarray
    NumPy ndarray with 'dtype' for its dtype.