A boolean array can be created manually by using
dtype=bool when creating the array. Values other than
False or empty strings are considered True.
import numpy as np bool_arr = np.array([1, 0.5, 0, None, 'a', '', True, False], dtype=bool) print(bool_arr) # output: [ True True False False True False True False]
Alternatively, numpy automatically creates a boolean array when comparisons are made between arrays and scalars or between arrays of the same shape.
arr_1 = np.random.randn(3, 3) arr_2 = np.random.randn(3, 3) bool_arr = arr_1 < 0.5 print(bool_arr.dtype) # output: bool bool_arr = arr_1 < arr_2 print(bool_arr.dtype) # output: bool