How to check if a Tensorflow Session is still open (without catching an exception)?

Question

Is there a way in Tensorflow to find if a given tf.Session() is still open? The only way I have found so far is to try to use it, and catch the exception when it is not open.

Answer 1

Check if session._closed is True

sess = tf.Session()
init_op = tf.global_variables_initializer()
sess.run(init_op)
print(sess._closed)
sess.close()
print(sess._closed)

Output

False
True