Implement Problems One to Five

[jeffgoot]

Implement the first 5 problems described in https://www.ic.unicamp.br/~meidanis/courses/mc336/2006s2/funcional/L-99_Ninety-Nine_Lisp_Problems.html.

@JasonGoot , your task is the following:

1. Implement your solution to problems 1 to 5, and put them in the pre-existing OneToTwenty class.
2. Make sure that the unit tests all pass.

Read the following for additional information:
https://www.jetbrains.com/help/pycharm/configuring-python-interpreter.html#add-existing-interpreter
https://www.jetbrains.com/help/pycharm/managing-dependencies.html

Lastly, make sure that you update your local repository before working on it. You can do that through the command line via the comment git pull. You may also be able to do it in PyCharm.

[jeffgoot]

@JasonGoot , good job implementing your solution to the first 5 problems. Now, let's go back to them and improve the code -- e.g., passing an empty list, None, etc. I'll add more test cases that will make your code fail, and then you'll update the code to handle those edge cases.

If you haven't already, read the document on exception handling. I put the link in the reading materials.

The above is important because these edge cases need to be handled in real life applications so the users are guided when issues happen. For example, logging in without a password or a username. Apps need to handle that case and tell the user what's wrong and how to correct it.

[jeffgoot]

@JasonGoot , here's the summary of your next task:

1. Read the documentation on exceptions in Python. The link is in the Google Doc document.
2. Revisit the code that you wrote the other day so that the test cases would pass. Basically, make use of exceptions to communicate unrecoverable error conditions.
3. Add test cases for Problem 6, and I will write the code. Be as specific with your test scenarios.

That's it for now. Enjoy!

[jeffgoot]

@JasonGoot , good job on the first half of the previous task. Now, let's do the second half which is:

Add test cases for Problem 6, and I will write the code. Be as specific with your test scenarios.