<s> from __future__ import absolute_import , division , with_statement <EOL> from revolver import command , package <EOL> def install ( ) : <EOL> package . install ( [ "<STR_LIT>" , "<STR_LIT>" ] ) <EOL> def ensure ( ) : <EOL> if not command . exists ( "<STR_LIT>" ) : <EOL> install ( ) </s>
