Let's look at an example of Hello, world! using TensorFlow. We will go over this example directly in the Python shell:

1. Enter the Python shell.
2. Import TensorFlow with the following command:

>>>import tensorflow as tf

3. TensorFlow can understand constants, variables, and operations, when defined with a tf base definition. Define a constant string as follows:

>>>hello_world = tf.constant("Hello, world!")

4. Create a session:

>>>sess = tf.Session()

5. Run the session:

>>>print(sess.run(hello_world))

6. The output should be as follows:

Hello, world!

Congratulations! You have written your first program using TensorFlow. Next, we will introduce a few concepts for using TensorFlow.