python - Remove duplicates from list of lists -


i have list containing ~300 lists, of them duplicates , remove them. i've tried:

cleanlist = [cleanlist.append(x) x in oldlist if x not in cleanlist]

but keeps throwing runtimeerror: maximum recursion depth exceeded in comparison @ me. tried sys.setrecursionlimit(1500) didn't help.

what's better way this?

you're adding bunch of stuff cleanlist based on whether it's in cleanlist (which doesn't exist yet), , saving value returned append() operation (which none) cleanlist. not end well.

a better way old-fashioned loop construct:

cleanlist = [] x in oldlist:     if x not in cleanlist:         cleanlist.append(x)

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