在 2012年2月11日星期六UTC+8上午7时57分56秒，Paul Rubin写道： > Righard van Roy > writes: > > I want to add an item to a list, except if the evaluation of that item > > results in an exception. > > This may be overkill and probably slow, but perhaps most in the spirit > that you're asking. > > from itertools import chain > > def r(x): > if x > 3: > raise(ValueError) > return x > > def maybe(func): > try: > yield func() > except: > return > I am wondering at which level to yield in a nested decorated function is more controllable.
It is definitely wrong to yield in manny levels decorated. > def p(i): return maybe(lambda: r(i)) > > your_list = list(chain(p(1), p(5))) > print your_list -- http://mail.python.org/mailman/listinfo/python-list
