On Aug 10, 5:12 pm, "Diez B. Roggisch" <de...@nospam.web.de> wrote: > Cornelius Keller wrote: > > Hi, > > > I'm a quite fresh python programmer, (6 Month python experience). > > Today I found something I absolotly don'nt understand: > > > given the following function: > > > def test_effect(class_id=None,class_ids=[]): > > if class_id is not None: > > if class_id not in class_ids: > > class_ids.append(int(class_id)) > > > print class_ids > > > I observe that the class_ids array is growing when it is called with > > different class id's. > > > I expected class_ids to be [] if the keyword argument is not set, but > > it seems to beahve like a static variable if not set. > > http://effbot.org/zone/default-values.htm > > Diez
Maybe on the first page of python.org there should be a 'python gotchas' link to a page listing these few non-intuituive peculiarities of our beloved snake ... same goes for the official python tutorial ... Ciao ----- FB -- http://mail.python.org/mailman/listinfo/python-list
