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lang-py
listandndarrayare mutable -- if you tried to define a hash value of alistit would need to work based on the hash values of the contents of thatlist-- but if the contents can change because it is mutable, then the hash value could suddenly be wrong for the contents of the array.writeableflag toFalse-- which is a big deal if you want to mutate these arrays (which I assume is an important point of using them).