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This is one of most annoying things in Python to me. When you want accept any bytes-like object in you bytes-processing function you need special case empty input.
def foo(data):
 data = memoryview(data)
 if data:
 data = data.cast('B')
 else:
 data = b''
You can't use just memoryview(data).cast('B') because it doesn't work for empty data.
>>> memoryview(b'').cast('b')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: memoryview: cannot cast view with zeros in shape or strides
It would be very nice to allow cast() for empty views.