Practical Programming, 2nd Edition

Defining Your Own Modules

​Writing and Running a Program​, explained that in order to save code for later use, you can put it in a file with a .py extension, and it demonstrated how to run that code. Chapter 3, ​Designing and Using Functions​, also included this function definition:

>>> def convert_to_celsius(fahrenheit):
...     """ (number) -> float
...
...     Return the number of Celsius degrees equivalent to fahrenheit degrees.
...
...     >>> convert_to_celsius(75)
...     23.88888888888889
...     """
...     return (fahrenheit - 32.0) * 5.0 / 9.0
...

Put the function definition for convert_to_celsius from ​Defining Our Own Functions​, in a file called temperature.py. (You can save this ...