import numpy as np arr = np.array([41, 42, 43, 44]) # Create an empty list filter_arr = [] # go through each element in arr for element in arr: # if the element is higher than 42, set the value to True, otherwise False: if element > 42: filter_arr.append(True) else: filter_arr.append(False) newarr = arr[filter_arr] print(filter_arr) print(newarr)