Reconfigured AbstractApplication to inherit from abc.ABC

[tobsecret]

Canonically @abc.abstractmethod is used to designate methods that are mandatory for subclasses to implement - otherwise those classes fail at instantiation. This behavior is only active if the class inherits from abc.ABC or analogons.
However, @abc.abstractmethod can also be used to simply add the __isabstractmethod__ property to a class or instance method which is how it was used in AbstractApplication.

I have reconfigured the AbstractApplication to inherit from abc.ABC and have replaced the logic that @abc.abstractmethod was used for previously with is_implemented.

There is some discussion to be had about the exact implementation of is_implemented. Currently it is hardcoded to check whether a method of specifically AbstractApplication was overridden, as opposed to the base class of the instance self.__class__.__bases__[0].

• 🐛   Bug fix
• 🚀   New feature
• 🔧   Code refactor
• ⚠️   Breaking change that would cause existing functionality to change
• 📘   I have updated the documentation accordingly
• ✅   I have added tests to cover my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.55%. Comparing base (4b8dadc) to head (9daba61).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   95.54%   95.55%           
=======================================
  Files          19       19           
  Lines        2381     2386    +5     
=======================================
+ Hits         2275     2280    +5     
  Misses        106      106           

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[juanesarango]

Great! Thanks for the contribution fixing this @tobsecret!

Allow me to run a couple of tests on our apps using this branch, before merging it.

[tobsecret]

@juanesarango sure thing! Thanks for the pairing session today!
As the maintainer you should be able to just press the merge button when you're done running your extra tests - I'll leave it up to you.

[miraep8]

Looks good to me 👍 Thanks for working on this team!