Ask for help about a tkinter problem

[Terry Reedy]

 > On 2017-08-21 01:28, jfong at ms4.hinet.net wrote:
 >> Peter Otten at 2017/8/20 UTC+8 PM 5:52:24 wrote:
 > [snip]
 >
 >>> That is just a peculiarity of TCL; a "-" is added to the option by the
 >>> Python wrapper before passing it along
 >>
 >> This extra "-" confuses people when showing up in the Traceback info.
 >> Can't figure out why the author want to do this.
 >>
 > To clarify what Peter said, tkinter is a GUI library written in the Tcl
 > programming language.
The Tcl GUI framework is tk, not tkinter.
 > The 'tkinter' module in Python's standard library is just a wrapper
 > around that library.

tkinter abbreviates tk interface.  In particular, it adds a Python 
class-based interface to tcl and tk functions and structures.

 > The "-" is added because the Tcl language requires it.