Calling mainloop after setting the value of a ttk.LabeledScale raises an error. The same happens if the value is set after entering the mainloop.Does not affect python 3.4.3. Does not affect ttk.Scale. No error is raised if you do not call mainloop.import tkinter as tkimport tkinter.ttk as ttkroot = tk.Tk()w = ttk.LabeledScale(root)w.pack()w.scale.set(1)root.mainloop()Traceback (most recent call last):  File "d:\users\u938001\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1550, in __call__    return self.func(*args)  File "d:\users\u938001\AppData\Local\Programs\Python\Python35-32\lib\tkinter\ttk.py", line 1540, in _adjust    newval = self._variable.get()  File "d:\users\u938001\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 355, in get    return self._tk.getint(self._tk.globalgetvar(self._name))TypeError: getint() argument must be str, not floatDuring handling of the above exception, another exception occurred:Traceback (most recent call last):  File "itcomp.py", line 8, in <module>    root.mainloop()  File "d:\users\u938001\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1131, in mainloop    self.tk.mainloop(n)  File "d:\users\u938001\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1554, in __call__    self.widget._report_exception()AttributeError: 'IntVar' object has no attribute '_report_exception'

This is caused by replacing int() by self._tk.getint() in IntVar.get() (issue23880). But the failure can be reproduced even in 3.4 if set tk.wantobjects = 0 before creating root widget.One way is making getint() accepting floats. This fizes original example, but doesn't solve the issue for tk.wantobjects = 0.Other way is making IntVar.get() falling back to integer part of getdouble(). This fixes the example in both modes. Proposed patch goes this way.

New changeset394b2b4da150 by Serhiy Storchaka in branch '3.5':Issue#27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale causedhttps://hg.python.org/cpython/rev/394b2b4da150New changeset91884d043fdc by Serhiy Storchaka in branch '3.6':Issue#27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale causedhttps://hg.python.org/cpython/rev/91884d043fdcNew changeset9e3931aa1ff0 by Serhiy Storchaka in branch 'default':Issue#27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale causedhttps://hg.python.org/cpython/rev/9e3931aa1ff0