Hi, I'm glad you finally got it working!
On Fri, 5 Feb 2016 16:56:58 +0200 Reinis Danne <rei4...@gmail.com> wrote: (...) > Replacing this: > map(self.paper.delete, items) > > with this: > for i in items: > self.paper.delete(i) > > fixes the problem. > > I don't understand why the difference. That code is equivalent in > both cases as far as I know. Is there a bug or I'm using map() > incorrectly? I'm not sure about this, the behavior of map() seems to have changed in Python3, I just tried the following with Python2 first: $ python Python 2.7.9 (default, Mar 1 2015, 12:57:24) [GCC 4.9.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> l = ['a', 'b', 'c'] >>> def test(x): ... print(x) ... >>> map(test, l) a b c [None, None, None] >>> and then with Python3: $ python3 Python 3.4.2 (default, Oct 8 2014, 10:45:20) [GCC 4.9.1] on linux Type "help", "copyright", "credits" or "license" for more information. >>> l = ['a', 'b', 'c'] >>> def test(x): ... print(x) ... >>> map(test, l) <map object at 0x7fdfcc6342b0> >>> Personally I hardly ever use map(), so I never noticed that. In fact this change is actually documented, see https://docs.python.org/3.0/whatsnew/3.0.html#views-and-iterators-instead-of-lists : "map() and filter() return iterators. If you really need a list, a quick fix is e.g. list(map(...)), but a better fix is often to use a list comprehension (especially when the original code uses lambda), or rewriting the code so it doesn’t need a list at all. Particularly tricky is map() invoked for the side effects of the function; the correct transformation is to use a regular for loop " Not sure what's the use of these map objects, in Python3 now you can call the map object's __next__() method to iterate. But for your purpose certainly the for loop is the way to go. Best regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. Intuition, however illogical, is recognized as a command prerogative. -- Kirk, "Obsession", stardate 3620.7 _______________________________________________ Tkinter-discuss mailing list Tkinter-discuss@python.org https://mail.python.org/mailman/listinfo/tkinter-discuss
