In random_key(), type/value check num_tries #279
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I'm not a fan of `isinstance()` type checks (as opposed to duck typing). But since `num_tries` establishes the base case for our recursive function, it's worth coding defensively here.
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I'm not a fan of
isinstance()type checks (as opposed to duck typing).But since
num_triesestablishes the base case for our recursivefunction, it's worth coding defensively here.