tf.app.run() 运行结束时，报错：SystemExit exception: no description

环境：Python3.6.6 + tensorflow-gpu

源码如下：

import tensorflow as tf

def main():
    print("hello tf.app.run")

if __name__ == '__main__':
    tf.app.run()

运行完后，提示

Exception has occurred: SystemExit
exception: no description
File "/home/work/Downloads/SSD-Tensorflow/test.py", line 10, in <module> tf.app.run()

改为直接调用main()函数，就好了。

import tensorflow as tf

def main():
    print("hello tf.app.run")

if __name__ == '__main__':
    main()

即便不改，程序结果也是正确的。

参考了：https://blog.****.net/forestlinzi0059/article/details/79016700