Winnow empty items

[kwinkunks]

E.g. blank picks. True by default.

[EvanBianco]

For processing sets of picks on a given challenge, we can remove blank picks using a list comprehension like so. Perhaps this needs to be written as a function.

[pick for pick in picks if len(pick.picks) != 0]

I imagine there might be some other lightweight utility functions we'll need to define for cleaning and conditioning pick sets.

[kwinkunks]

This is a good general pattern, but if you're just going to iterate over the result of this list comprehension, you can just do this:

filter(None, picks)

...because using None like this removes all falsy things. In this case, that's OK. It returns an iterator.

In your case you could also do [pick for pick in picks if pick] — again because the empty list is falsy. It reads pretty weird though.