## tensorflow 1.x

import tensorflow as tf

a = tf.constant([False,False,True,False,True],dtype=tf.bool)

b = tf.where(a)

sess = tf.Session()

print(sess.run(b))

​

## tensorflow 2.x

import tensorflow as tf

a = tf.constant([False,False,True,False,True],dtype=tf.bool)

b = tf.where(a)

print(b)

​

# have a great day ! ~