argtest.py

  A generalized argument validator for you to study on your own. It uses a 
  passed-in validation function, to which it passes the test’s criteria value 
  coded for the argument in the decorator.  This handles ranges, type tests, 
  value testers, and almost anything else you can dream up in an expressive 
  language like Python.  This also refactors the code a bit to remove minor
  redundancy.  See this module’s self-test files below for usage examples and
  expected output.  Per this example’s caveats described earlier, this decorator
  doesn’t fully work in nested mode as is: only the most deeply nested validation
  is run for positional arguments, but its arbitrary valuetest can be used to 
  combine differing types of tests in a single decoration (though the amount 
  of code needed in this mode may make a simple assert more attractive!).

argtest_testfunc.py

  Import argtest's decorator and test it on a variety of function calls.

argtest_testmeth.py

  Import argtest's decorator and test it on a variety of function calls.  As we've 
  learned, this decorator’s coding structure works for both functions and methods.

results.txt

  Outputs from the two preceding test scripts.