STINNER Victor added the comment:
Calling "self.tk.call('update')" runs the Tcl event loop:
* http://wiki.tcl.tk/1252
* https://www.tcl.tk/man/tcl/TclCmd/update.htm
Interesting but very old (2001) article: "Update considered harmful"
http://wiki.tcl.tk/1255
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title: test_ttk_guionly hangs at self.tk.call('update') on AMD64 Windows8.1
Refleaks 2.7 -> [2.7] test_ttk_guionly hangs at self.tk.call('update') on AMD64
Windows8.1 Refleaks 2.7
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<http://bugs.python.org/issue31068>
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