<s> from invoke import task , Collection <EOL> @ task ( aliases = [ '<STR_LIT>' ] ) <EOL> def top_level ( ) : <EOL> pass <EOL> @ task ( aliases = [ '<STR_LIT>' ] , default = True ) <EOL> def sub_task ( ) : <EOL> pass <EOL> sub = Collection ( '<STR_LIT>' , sub_task ) <EOL> ns = Collection ( top_level , sub ) </s>
