Update coding style after pycodestyle 2.1.0
authorYen Chi Hsuan <yan12125@gmail.com>
Thu, 17 Nov 2016 11:42:56 +0000 (19:42 +0800)
committerYen Chi Hsuan <yan12125@gmail.com>
Thu, 17 Nov 2016 11:45:42 +0000 (19:45 +0800)
In pycodestyle 2.1.0, E305 was introduced, which requires two blank
lines after top level declarations, too.

See https://github.com/PyCQA/pycodestyle/issues/400

See also #10689; thanks @stepshal for first mentioning this issue and
initial patches


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