Fix memoryview type checking issue

[XeniaLu]

Fix the compilation error:

error: call to undeclared function 'PyMemoryView_CheckExact'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  if (!(likely(PyMemoryView_CheckExact(__pyx_v_rv))||((__pyx_v_rv) == Py_None) || __Pyx_RaiseUnexpectedTypeError("memoryview", __pyx_v_rv))) __PYX_ERR(0, 172, __pyx_L1_error)

[da-woods]

Thanks. Do you have some code that causes this issue? It would be good to add a small test to check it doesn't recur.

[da-woods]

Looks good thanks.

One suggestion to simplify the test

[XeniaLu]

Thanks.

[da-woods]

I'll wait for the CI to pass then merge this

[XeniaLu]

Sorry, I have to modify the test again. Actually the issue arises from converting an unknown type of Python object to a memoryview

[da-woods]

Thanks for this.

3.0.x commit is 29cf53e