fix pep8 report
fix pep8 report

souravsingh/khmer,Winterflower/khmer,F1000Research/khmer,souravsingh/khmer,ged-lab/khmer,ged-lab/khmer,Winterflower/khmer,jas14/khmer,Winterflower/khmer,souravsingh/khmer,F1000Research/khmer,jas14/khmer,F1000Research/khmer,ged-lab/khmer,jas14/khmer