avatar Bite 24. ABC's and class inheritance

ABC's or Abstract Base Classes are great to enforce a common API for your subclasses.

You define one or more methods and/or properties as abstract in the base class, and if the subclass does not implement them it raises a TypeError. In this bite you will use this concept as follows:

  1. Define a Challenge base class that inherits from ABC (given), its constructor receives a number and a title attribute.
  2. On Challenge define an abstractmethod called verify and a property (< 3.3 it would be an abstractproperty) called pretty_title.
  3. Create the BlogChallenge and BiteChallenge classes which both inherit from Challenge. Note that they would raise a TypeError at this point, exactly what you want: enforcing the use of the abstract method/ property.
  4. BlogChallenge and BiteChallenge's constructors call the parent constructor (don't worry it's supercool, remember: we use Python3 so adjust your syntax), and both receive an extra argument in the constructor: merged_prs for BlogChallenge and result for BiteChallenge.
  5. Implement the required methods and properties, refer to the tests what they need to return.

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