Check if return value is instance of Py_None

Question

I have to use a c function (myAPI.readArr) that returns a scalar,numpy.ndarray or Py_None on failure.

This works for a failure:

data = myAPI.readArr(arg1, arg2)
if not data:
   raise Exception("Problem!")

but for valid arguments I get:

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

How can I check that the call succeeded or not?

Answer 1

data = myAPI.readArr(arg1, arg2)
if data is None:
   raise Exception("Problem!")

This answer contains more details about comparison to None