Serhiy Storchaka added the comment:

A simplest solution is to raise a TclError instead of ValueError for non-BMP 
characters. This should not break any existing code, because a user code should 
be ready to catch a TclError in any case. Here is a patch.

A more complicated solution is to add ValueError to any catch of TclError. And 
this will fix only IDLE, user programs should fix self every.

Also we can silently encode non-BMP characters for Tcl with UTF-16 (and decode 
a result back). This can cause some subtle errors with shifted indices however.

----------
keywords: +patch
nosy: +serhiy.storchaka
versions: +Python 2.7
Added file: http://bugs.python.org/file28376/tkinter_nobmp_error.patch

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<http://bugs.python.org/issue13153>
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