import numpy as np
a=np.array([0,0,1,1]).astype("bool")
b=np.arange(4)
print("b\n",b)
# b
#  [0 1 2 3]
c=b[a]
print("c\n",c)
# c
#  [2 3]
print("~a\n",~a)
# ~a
#  [ True  True False False]
 

c_=b[~a]
print("c_\n",c_)
# c_
#  [0 1]

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