You don't need to copy the list; but if you don't, your original list
will be emptied.
Len(rows) recalculates each time the while loop begins. Now that I
think of it, "rows != []" is faster than "len(rows) > 0."
By the way, you can also do this using (gasp) a control index:
def grouprows(rows):
index = 0
while len(rows) > index:
rowspan = rows[index]["rowspan"]
yield rows[index:rowspan + index]
index += rowspan
...which kind of brings us back to where we started.
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