import tensorflow as tf

state = tf.Variable(0,name='counter')

print(state.name)

counter:0

one = tf.constant(1)
new_value = tf.add(state,one)
update = tf.assign(state,new_value)
init = tf.global_variables_initializer() #如果定义了变量，一定要先初始化

with tf.Session() as sess:
    sess.run(init)            #初始化必须run之后才生效
    for _ in range(3):
        sess.run(update)
        print(sess.run(state))#所有需要结果的变量都必须run

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