linking to a part of bytes object in python 3

Question

I need to have an original object (bytes) and this object minus last 20 bytes in python 3. I can do like this:

b = a[0:-20]

but it makes a copy of my object. Can I save memory linking to a part of an object?

Answer 1

Yeah, use a memoryview:

b = memoryview(a)[:-20]

As the documentation notes:

memoryview objects allow Python code to access the internal data of an object that supports the buffer protocol without copying.