def break_around_binary_operator(logical_line, tokens):
 def is_binary_operator(token_type, text):
  return (((token_type == tokenize.OP) or (text in ['and', 'or'])) and (text not in '()[]{},:.;@=%'))
 line_break = False
 unary_context = True
 for (token_type, text, start, end, line) in tokens:
  if (token_type == tokenize.COMMENT):
   continue
  if ((('\n' in text) or ('\r' in text)) and (token_type != tokenize.STRING)):
   line_break = True
  else:
   if (is_binary_operator(token_type, text) and line_break and (not unary_context)):
    (yield (start, 'W503 line break before binary operator'))
   unary_context = (text in '([{,;')
   line_break = False

def break_around_binary_operator ( logical_line , tokens ) : def is_binary_operator ( token_type , text ) : return ( ( ( token_type == tokenize . OP ) or ( text in [ 'and' , 'or' ] ) ) and ( text not in '()[]{},:.;@=%' ) ) line_break = False unary_context = True for ( token_type , text , start , end , line ) in tokens : if ( token_type == tokenize . COMMENT ) : continue if ( ( ( '\n' in text ) or ( '\r' in text ) ) and ( token_type != tokenize . STRING ) ) : line_break = True else : if ( is_binary_operator ( token_type , text ) and line_break and ( not unary_context ) ) : ( yield ( start , 'W503 line break before binary operator' ) ) unary_context = ( text in '([{,;' ) line_break = False
avoid breaks before binary operators .