Assignment

In this lesson’s assignment we are going to apply language features like decorators, context managers and recursion that can help to build expressive programs that are easy to understand.

Here is what you need to do:

  1. Revisit your logging assignment from lesson 2. We are going to make logging selective, by using decorators.

    Add decorator(s) to introduce conditional logging so that a single command line variable can turn logging on or off for decorated classes or functions.

  2. Change the lesson 5 assignment to Write a context manager to access MongoDB. There is already an example in lesson 5, but build on this example. Try to add useful features based on your experience of the Python techniques you have learned. It may not be obvious what to add, but think what would be useful when developing.

  3. HP Norton keeps pictures of all their furniture in png files that are stored on their file server. They have a very crude program that starts by discovering all directories on the server and then looking in each of those for the png files. They have discovered a problem, though: png files are not found when they are stored in directories that are more than one level deep from the root directory. Your job is to write a png discovery program in Python, using recursion, that works from a parent directory called images provided on the command line. The program will take the parent directory as input. As output, it will return a list of lists structured like this: [“full/path/to/files”, [“file1.png”, “file2.png”,…], “another/path”,[], etc] The program must be called pngdiscover.py

Other requirements:

  • Your code should not trigger any warnings or errors from Pylint.