class ReadonlyMemoryView:
    def __init__(self, obj):
        self.view = memoryview(obj)
 
    def __getitem__(self, index):
        value = self.view[index]
        if isinstance(index, slice):
            return self.__class__(value)
        return value
 
    def __setitem__(self, index, value):
        raise TypeError('cannot modify read-only memory')
 
    def __delitem__(self, index):
        raise TypeError('cannot modify read-only memory')
 
    def __getattr__(self, name):
        return getattr(self.view, name)
 
m = ReadonlyMemoryView(bytearray(range(10)))
print(m[3:7][1:3].tolist())
m[3] = 1

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