get_minibatch not found

[dpnolan]

Chapter 3, section 'Sessions in TensorFlow', Safari version

Cannot find source of import - where is read_data module found?

---

from read_data import get_minibatch()
^
SyntaxError: invalid syntax

from read_data import get_minibatch

---

from read_data import get_minibatch

ImportError: No module named 'read_data'

Using Python 3.5 from Conda, with TensorFlow 1.0.1