In [1]: [4, None, 'foo'] + [7, 8, (2,3)]
Out[1]: [4, None, 'foo', 7, 8, (2, 3)]
In [2]: x = [4, None, 'foo']
In [3]: x.extend([7, 8, (2, 3)])
In [4]: x
Out[4]: [4, None, 'foo', 7, 8, (2, 3)]
In [1]: [4, None, 'foo'] + [7, 8, (2,3)]
Out[1]: [4, None, 'foo', 7, 8, (2, 3)]
In [2]: x = [4, None, 'foo']
In [3]: x.extend([7, 8, (2, 3)])
In [4]: x
Out[4]: [4, None, 'foo', 7, 8, (2, 3)]
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