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import tensorflow as tf

x = tf.constant(1, name="x")
y = tf.placeholder(tf.int32, name="y")

sum = tf.add(x, y)

with tf.Session() as sess:
    sess.run(tf.global_variables_initializer())
    print(sess.run(sum, feed_dict={y:2}))
    print(sess.run(sum, feed_dict={y:4}))