查看已安装tensorflow版本的方法示例

import tensorflow as tf

tf.__version__

pip install tensorflow==1.2   # Python 2.7; 仅支持CPU
pip3 install tensorflow==1.2   # Python 3.n; 仅支持CPU 
pip install tensorflow-gpu==1.2   # Python 2.7; 支持CPU
pip3 install tensorflow-gpu==1.2   # Python 3.n; 支持CPU

python
> import tensorflow as tf 
> hello = tf.constant('Hello, TensorFlow!') 
> sess = tf.Session() 
> print(sess.run(hello))

sudo pip uninstall protobuf
sudo pip uninstall tensorflow