After installing tensorflow, I tried to run the demo script found at https://www.tensorflow.org/tutorials?
In a common python shell, the "model.fit(x_train, y_train, epochs=5)" step takes a few minutes. In IDLE, no end is in sight after half an hour.
While the output looks normal in the common shell, IDLE shows some control characters (see attached screenshot).
Windows Task Managers shows a "pythonw.exe" process taking up 25% of CPU (i.e. 1 of 4 cores).