$ python
Python 3.6.5 |Anaconda Inc.| (default, Apr 29 2018, 16:28:17)
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy as np
>>> a = np.array([3,0,0,4,0,8])
>>> a
array ([3, 0, 0, 4, 0, 8])
>>> a.dtype = bool
>>> a
array([ True, False, False, False, False, False, False, False, False,
       False, False, False,  True, False, False, False, False, False,
       False, False,  True, False, False, False])
>>>