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pythonneural-networkiteratorslice

What does [...] mean used after .next function?

I'm reading a code on Neural Networks, i have this code:

test_dir = os.path.join(dataset_dir, 'test')
test=os.path.join(test_dir,'images/img')
image_filenames=next(os.walk(test))[2]

which is a simple access to a directory that contains my testing data. The question is: what does the [2] mean used after the next function?

I've been searching on google, but i didn't find anything about it.

Solution

  • os.walk() yields a 3-tuple, consisting of (dirpath, dirnames, filenames). The [2] just grabs the 3rd element of that tuple, as tuples are 0-indexed in python. So the returned value is filenames.