On Saturday, November 14, 2015 at 12:23:50 PM UTC-5, fl wrote: > Hi, > > I follow a tutorial to learn decorator: > > http://simeonfranklin.com/blog/2012/jul/1/python-decorators-in-12-steps/ > > I use Enthought Canopy to run the following code. > It is really strange that the wrapper does not take effect. > In fact, I go back to the basic way (not with @): > > wrapper(sub(two, one)) > Out[38]: <function checker> > > > When I use the non-wrapper mode, it has Coord print out. > If I use wrapper, it has nothing to print out. > Due to no debug mode help, I don't see anything wrong yet. > > > (add(two, one)) > # nothing print out > (sub(two, three)) > Out[43]: Coord:-- {'y': 300, 'x': 400} # correct is here > > > Anyone can help? > Thanks, > > > > ............ > class Coordinate(object): > def __init__(self, y, x): > self.y = y > self.x = x > def __repr__(self): > return "Coord:-- " + str(self.__dict__) > > def add(a, b): > return Coordinate(a.x + b.x, a.y + b.y) > > def sub(a, b): > return Coordinate(a.x - b.x, a.y - b.y) > > def wrapper(func): > def checker(a, b): # 1 > if a.x < 0 or a.y < 0: > a = Coordinate(a.x if a.x > 0 else 0, a.y if a.y > 0 else 0) > if b.x < 0 or b.y < 0: > b = Coordinate(b.x if b.x > 0 else 0, b.y if b.y > 0 else 0) > ret = func(a, b) > if ret.x < 0 or ret.y < 0: > ret = Coordinate(ret.x if ret.x > 0 else 0, ret.y if ret.y > > 0 else 0) > return ret > return checker > > one = Coordinate(100, 200) > two = Coordinate(300, 200) > three = Coordinate(-100, -100) > > add = wrapper(add) > #sub = wrapper(sub)
Excuse me. I just realize that the indent made the logic incorrect. It is different from other language. Thanks. -- https://mail.python.org/mailman/listinfo/python-list
