[issue22340] Fix Python 3 warnings in Python 2 tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset 407653078135 by Victor Stinner in branch '2.7':
Issue #22340: Fix test_collections if the sets module was already imported
http://hg.python.org/cpython/rev/407653078135

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<http://bugs.python.org/issue22340>
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