test1_3.py

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import tensorflow as tf

state = tf.Variable(0,name='counter')
one = tf.constant(1)
new_value = tf.add(state,one)
update = tf.assign(state,new_value)

init = tf.initialize_all_variables()

with tf.Session() as sess:
    sess.run(init)
    for _ in range(3):
        sess.run(update)
        print(sess.run(state))