In <[email protected]> Ho Yeung Lee
<[email protected]> writes:
> I find that list can not be key in dictionary
> then find tuple can be as key
> but when I add new tuple as key , got error in python 2.7
> groupkey = {(0,0): []}
> groupkey[tuple([0,3])] = groupkey[tuple([0,3])] + [[0,1]]
The right-hand side of your expression is rightly complaining that
groupkey[(0,3)] doesn't exist.
Would you expect to say
a = a + 1
When a doesn't exist? Your code tries to do much the same thing.
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