comparing values in two sets

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    John> I'd like to compare the values in two different sets to test if
    John> any of the positions in either set share the same value (e.g., if
    John> the third element of each set is an 'a', then the test fails).

Do you really mean "set" and not "list"?  Note that they are unordered.
These two sets are equal:

    set(['b', 'a', 'c'])

    set(['a', 'b', 'c'])

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