Minoru TAKAHASHI ecfd21e5f9 fixes for mutable default arguments
modify the default argument from list to None,
because default value {}/[] as argument is dangerous.

Signed-off-by: Minoru TAKAHASHI <takahashi.minoru7@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
2016-01-19 10:03:57 +09:00
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