How to remove the innermost level of nesting in a list of lists of varying lengths

Question

I\'m trying to remove the innermost nesting in a list of lists of single element length lists. Do you know a relatively easy way (converting to NumPy arrays is fine) to get

Answer 1

Try this:

l = [ [ [1],[2],[3],[4],[5] ],
      [ [6],[7],[8], [None],[None]] ,
      [ [11],[12],[None],[None],[None]] ]

l = [ [x[0] for x in s if x[0] is not None] for s in l]