Testing a variable matches 1 of 2 values (Python 2.7)

testing.sh

$ python -m timeit -s "v = 'foo'" "v == 'foo' or v == 'bar'"
10000000 loops, best of 3: 0.163 usec per loop
$ python -m timeit -s "v = 'bar'" "v == 'foo' or v == 'bar'"
1000000 loops, best of 3: 0.233 usec per loop
$ python -m timeit -s "v = 'baz'" "v == 'foo' or v == 'bar'"
1000000 loops, best of 3: 0.241 usec per loop
$ python -m timeit -s "v = 'foo'" "v in ('foo', 'bar')"
10000000 loops, best of 3: 0.145 usec per loop
$ python -m timeit -s "v = 'bar'" "v in ('foo', 'bar')"
10000000 loops, best of 3: 0.155 usec per loop
$ python -m timeit -s "v = 'baz'" "v in ('foo', 'bar')"
10000000 loops, best of 3: 0.166 usec per loop
$ python -m timeit -s "v = 'foo'" "v in {'foo', 'bar'}"
1000000 loops, best of 3: 0.232 usec per loop
$ python -m timeit -s "v = 'bar'" "v in {'foo', 'bar'}"
1000000 loops, best of 3: 0.236 usec per loop
$ python -m timeit -s "v = 'baz'" "v in {'foo', 'bar'}"
1000000 loops, best of 3: 0.238 usec per loop
$ python --version
Python 2.7.14