[Python] Size of data type using NumPy

In NumPy, I can get the size (in bytes) of a particular data type by:

datatype(...).itemsize


or:

datatype(...).nbytes


For example:

np.float32(5).itemsize # 4
np.float32(5).nbytes # 4


I have two questions. First, is there a way to get this information without creating an instance of the datatype? Second, what's the difference between itemsize and nbytes?

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