remove the default arguments "[]" or "{}" when the function is defined.
ref: http://docs.python-guide.org/en/latest/writing/gotchas/
Change-Id: I93de22c6b3a48c3a0e6365756f8b6b5839844826
remove the default arguments "[]" or "{}" when the function is defined.
ref: http://docs.python-guide.org/en/latest/writing/gotchas/
Change-Id: I93de22c6b3a48c3a0e6365756f8b6b5839844826