Mpaa added a comment.
For some queries, name space can assume a single value, for others it can be a list. See http://en.wikipedia.org/w/api.php?action=help&recursivesubmodules=1#quer... for single value. See https://en.wikipedia.org/w/api.php?action=help&modules=query%2Bbacklinks for multiple values.
class Paraminfo is already understanding if "namespace" is single or multi. This should be used in api.set_namespace when setting namespace for a QueryGenerator.
TASK DETAIL https://phabricator.wikimedia.org/T76794
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To: Mpaa Cc: Aklapper, XZise, Mpaa, jayvdb, pywikipedia-bugs