python技巧-使用os.path.join和os.path.sep.join

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%timeit os.path.sep.join(['a','b'])
os.path.sep.join(['a','b'])

The slowest run took 5.00 times longer than the fastest. This could mean that an intermediate result is being cached.
1000000 loops, best of 3: 238 ns per loop
'a/b'

%timeit os.path.join('a','b')
os.path.join('a','b')

The slowest run took 10.76 times longer than the fastest. This could mean that an intermediate result is being cached.
1000000 loops, best of 3: 643 ns per loop
'a/b'