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Python

Posted by Dan A
Dan A
Courses Plus Student 4,036 Points

functional programing solution

During the "Quiz Class" video, Kenneth mentioned a "functional programing" solution for determining the total_correct. Does anyone know what this solution might be? I came up with (I think) a list comprehension solution. Is this functional programming?

return len([ans for ans in self.answers if ans is True])

And, as a side question is my list comp solution any better than

        total = 0
        for ans in self.answers:
            if ans is True:
                total += 1
        return total

??

Thanks

Gergő Bogdán
Gergő Bogdán
6,664 Points

I think your first solution in syntax is similar to functional programs, but its not an actual functional program :)

I think both of your solutions are OK, but are not the same. In the second example you are simply counting the true values, not counting the length of a list in which you added only True elements.

1 Answer

Kenneth Love
STAFF
Kenneth Love
Treehouse Guest Teacher
Kenneth Love
Kenneth Love
Treehouse Guest Teacher

List comprehensions are similar to functional programing but lack a...function ;) That said, yeah, that's an acceptable way.

Since our list only contains True and False, you can actually do ti with:

total = len(list(filter(None, self.answers)))

We actually just filmed a workshop on functional programming in Python that'll be out on the site soon. It may be Pro-only, though, I'm not sure.