Numpy array, how to select indices satisfying multiple conditions?

Question

Suppose I have a numpy array x = [5, 2, 3, 1, 4, 5], y = ['f', 'o', 'o', 'b', 'a', 'r']. I want to select the elements in y corresponding to elements in x that are greater than 1 and less than 5.

I tried

x = array([5, 2, 3, 1, 4, 5])
y = array(['f','o','o','b','a','r'])
output = y[x > 1 & x < 5] # desired output is ['o','o','a']

but this doesn't work. How would I do this?

Answer 1

x_list = [ 5,  2,  3,  1,  4,  5 ]
y_list = ['f','o','o','b','a','r']

result = [y_list[i] for i, x in enumerate(x_list) if 1 < x < 5]

Answer 2

Your expression works if you add parentheses:

>>> y[(1 < x) & (x < 5)]
array(['o', 'o', 'a'], 
      dtype='|S1')