Identifying the necessary classes

We can learn a lot about what code we have to write by carefully examining our specification code. First let's look for calls to constructors. The form of a constructor is that it uses a class name as a function. We've seen examples of this with Python's built-in classes, e.g.

>>> num = int(43.72)
>>> num
43
>>> lst = list('Tim')
>>> lst
['T', 'i', 'm']
>>>

Now we want to look for similar syntax in our specification code,

Doing so reveals that two classes are explicitly referred to in our specification one called Hand and another called Deck.