I am building a list like this:
tree = []
for top in tops:
l2 = level2(top)
if l2:
tree.append((top, l2))
I would really like to turn this into a list comprehension:
tree = [ (top, level2(top)) for top in tops if level2(top) ]
but the call to level2() is expensive enough that I don't want to repeat
it. Is there any way to do this or am I stuck with the (IMO ugly) loop form?
Kent
who actually does have a question occasionally :-)
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