### This is an example module.txt file.
### It should contain unit tests and their expected results:

>>> 2 + 2
4

>>> '2' + '2'
'22'

### demo

### After the part that says 'demo' we have statements that
### are intended not as unit tests, but as demos of how to
### use the functions and methods in the module.  The 
### statements are executed, but the results are not
### compared to the expected results.  This can be useful
### for nondeterministic functions: 


>>> import random; random.choice('abc')
'c'