Raymond Hettinger added the comment:

Take a look at the following code from UserList.py in Python2.7 to get an idea 
of how this was implemented previously:

    def __getslice__(self, i, j):
        i = max(i, 0); j = max(j, 0)
        return self.__class__(self.data[i:j])
    def __setslice__(self, i, j, other):
        i = max(i, 0); j = max(j, 0)
        if isinstance(other, UserList):
            self.data[i:j] = other.data
        elif isinstance(other, type(self.data)):
            self.data[i:j] = other
        else:
            self.data[i:j] = list(other)
    def __delslice__(self, i, j):
        i = max(i, 0); j = max(j, 0)
        del self.data[i:j]

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27639>
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