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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"more conservative setattr_cm broke mplcairo","articleBody":"Trying to run tight_layout with mplcairo broke since https://github.com/matplotlib/matplotlib/pull/17620 with\r\n```\r\nValueError: trying to set draw_gouraud_triangles which is not a method, property, or instance level attribute\r\n```\r\nbecause the check `isinstance(cls_orig, types.FunctionType)` fails for extension methods (such as `GraphicsContextRendererCairo.\u003cany method\u003e`).  Looks like a better check is actually something like `isinstance(orig, types.MethodType) and hasattr(type(obj), attr)` (the first isinstance check verifies that `orig` is a *bound* method and then we just check that the attribute exists on the class and assume that if invoking the descriptor on it gives us a bound method, then we're good) -- at least it works for mplcairo...","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2020-06-16T13:58:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/17646/matplotlib/issues/17646"}