issue_comments: 1563318598
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| html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | issue | performed_via_github_app |
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| https://github.com/simonw/datasette/issues/2078#issuecomment-1563318598 | https://api.github.com/repos/simonw/datasette/issues/2078 | 1563318598 | IC_kwDOBm6k_c5dLllG | 9599 | 2023-05-25T18:17:03Z | 2023-05-25T18:21:25Z | OWNER | I think I want that to return `(is_callable, is_async)` - so I can both test if the thing can be called AND if it should be awaited in the same operation (without any exceptions). I tried this: ```python def is_callable(obj): "Returns (is_callable, is_async_callable)" if not callable(obj): return False, False if isinstance(obj, types.FunctionType): return True, asyncio.iscoroutinefunction(obj) if hasattr(obj, '__call__'): return True, asyncio.iscoroutinefunction(obj.__call__) return False, False ``` ```python for thing in ( async_func, non_async_func, AsyncClass(), NotAsyncClass(), ClassNoCall(), AsyncClass, NotAsyncClass, ClassNoCall ): print(thing, is_callable(thing)) ``` And got: ``` <function async_func at 0x1073d5120> (True, True) <function non_async_func at 0x1073d5080> (True, False) <__main__.AsyncClass object at 0x106cce490> (True, True) <__main__.NotAsyncClass object at 0x106ccf710> (True, False) <__main__.ClassNoCall object at 0x106ccc810> (False, False) <class '__main__.AsyncClass'> (True, True) <class '__main__.NotAsyncClass'> (True, False) <class '__main__.ClassNoCall'> (True, False) ``` Which is almost right, but I don't like that `AsyncClass` is shown as callable (which it is, since it's a class) and awaitable (which it is not - the `__call__` method may be async but calling the class constructor is not). So I'm going to detect classes using `isinstance(obj, type)`. ```python def is_callable(obj): "Returns (is_callable, is_async_callable)" if not callable(obj): return False, False if isinstance(obj, type): # It's a class return True, False if isinstance(obj, types.FunctionType): return True, asyncio.iscoroutinefunction(obj) if hasattr(obj, '__call__'): return True, asyncio.iscoroutinefunction(obj.__call__) assert False, "obj {} somehow is callable with no __call__ method".format(obj) ``` I am reasonably confident the `AssertionError` can never be raised. And now: ``` <function async_func at 0x1073d5120> (True, True) <function non_async_func at 0x1073d5080> (True, False) <__main__.AsyncClass object at 0x106ccfa50> (True, True) <__main__.NotAsyncClass object at 0x106ccc8d0> (True, False) <__main__.ClassNoCall object at 0x106cd7690> (False, False) <class '__main__.AsyncClass'> (True, False) <class '__main__.NotAsyncClass'> (True, False) <class '__main__.ClassNoCall'> (True, False) ``` Which is what I wanted. | {"total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | 1726236847 |