def parse_trees(filename):
 data = open('test_file', 'r').read()
 for tree_str in data.split(';\n'):
  if tree_str:
   (yield Trees.Tree((tree_str + ';')))

def parse_trees ( filename ) : data = open ( 'test_file' , 'r' ) . read ( ) for tree_str in data . split ( ';\n' ) : if tree_str : ( yield Trees . Tree ( ( tree_str + ';' ) ) )
helper function until we have bio .