Yes I use homebrew.

I have done :
brew update
brew upgrade

python 3.7.1 installed :
Python 3.7.1 (default, Nov  6 2018, 18:45:35)
[Clang 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

but I still have the crash with this version :

2018-11-10 15:37:54.784 Python[35388:488345] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFConstantString characterAtIndex:]: Range or index out of bounds'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff2b04123b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x00007fff522d2c76 objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff2b0d2d5d +[NSException raise:format:] + 205
	3   CoreFoundation                      0x00007fff2afbd236 -[__NSCFString characterAtIndex:] + 102
	4   Tk                                  0x00007fff37721343 TkpInitKeymapInfo + 731
	5   Tk                                  0x00007fff377271a1 Tk_MacOSXSetupTkNotifier + 798
	6   Tcl                                 0x00007fff37621a50 Tcl_DoOneEvent + 300
	7   _tkinter.cpython-37m-darwin.so      0x0000000106b877ab _tkinter_tkapp_mainloop + 256
	8   Python                              0x00000001061e3313 _PyMethodDef_RawFastCallKeywords + 496
	9   Python                              0x00000001061e7caa _PyMethodDescr_FastCallKeywords + 82
	10  Python                              0x0000000106278bd0 call_function + 801
	11  Python                              0x0000000106271758 _PyEval_EvalFrameDefault + 6991
	12  Python                              0x0000000106279432 _PyEval_EvalCodeWithName + 1835
	13  Python                              0x00000001061e2874 _PyFunction_FastCallKeywords + 225
	14  Python                              0x0000000106278ba0 call_function + 753
	15  Python                              0x0000000106271771 _PyEval_EvalFrameDefault + 7016
	16  Python                              0x0000000106279432 _PyEval_EvalCodeWithName + 1835
	17  Python                              0x000000010626fb81 PyEval_EvalCode + 42
	18  Python                              0x000000010629e6ed run_mod + 54
	19  Python                              0x000000010629d708 PyRun_FileExFlags + 164
	20  Python                              0x000000010629cdc2 PyRun_SimpleFileExFlags + 266
	21  Python                              0x00000001062b4adc pymain_main + 5665
	22  Python                              0x00000001062b50ff _Py_UnixMain + 75
	23  libdyld.dylib                       0x00007fff52eec015 start + 1
	24  ???                                 0x0000000000000002 0x0 + 2
)
libc++abi.dylib: terminating with uncaught exception of type NSException

> Le 10 nov. 2018 à 15:26, Karthikeyan Singaravelan <report@bugs.python.org> a écrit :
> 
> 
> Karthikeyan Singaravelan <tir.karthi@gmail.com> added the comment:
> 
> Thanks for the report. I added Ned since it seemed similar to issue32481 but  from Python 3.7 the Mac installers from python.org ship with in-built Tcl/Tk 8.6.8 as in which was the reported version https://www.python.org/download/mac/tcltk/#built-in-8-6-8 . I was able to reproduce the crash with attached file on 3.6 which was installed from Homebrew. I was not able to reproduce the crash on Python 3.7.1RC2 installed from python.org. I don't know if installing 3.7 from Homebrew might cause problems with my existing virtual environments to validate my assumption.
> 
> 1. @remi_bertholet Is Python 3.7 installed with Homebrew? 
> 2. Ned, does Python 3.7 that is installed from Homebrew ship with in-built Tcl/Tk similar to Mac installers from python.org?
> 
> ----------
> nosy: +xtreak
> 
> _______________________________________
> Python tracker <report@bugs.python.org>
> <https://bugs.python.org/issue35209>
> _______________________________________