Remove unused import, sort import, format source code. Add `from __future__ import unicode_literals` to ensure literals are unicode compliant.
Remove unused import, sort import, format source code. Add `from __future__ import unicode_literals` to ensure literals are unicode compliant.

pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus