- start_tag_method_names = filter(lambda k: k[:6] == 'start_', keys)
- end_tag_method_names = filter(lambda k: k[:4] == 'end_', keys)
+ start_tag_method_names = [k for k in keys if k[:6] == 'start_']
+ end_tag_method_names = [k for k in keys if k[:4] == 'end_']