import tensorflow as tf

judge_list = [True, False]
input_list = tf.constant([1.0, -1.0])
result_list = tf.where(judge_list,
                  input_list,
                  tf.ones(shape=[2]) * 2)

sess = tf.Session()
print(sess.run(result_list))

print结果：
​​​[1. 2.]​​

import tensorflow as tf

judge_list = [True, False]
input_list = tf.constant([1.0, -1.0])
result_list = tf.where(judge_list,
                  input_list,
                  input_list * 2)

sess = tf.Session()
print(sess.run(result_list))

print结果：
​​​[ 1. -2.]​​