Raise for status when Yahoo! returns 403 / use User-Agent header #74
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Sometimes Yahoo! returns 403. This causes a tuple destructuring error later in
parse_response(), when.json()actually does not return anything that can be destructured. The correct defensive behavior is to fail fast and exit here.For some symbols, there is no data in the return dictionary. This causes a destructuring
IndexError. We now correctly handle this.Finally, there is a problem when using the default
requestsuser agent (Y! always returns 403 in that case). So we use our own agent to make it work.