Prudent <zongj...@aliyun.com> added the comment:

The versions of Python, Tcl/Tk and MacOS I used are 3.8.5, 8.5.9 and the newest 
Catalina 10.15.6, respectively. 

Your words give me a hint about the version of Tcl/Tk. So I checked it. The 
version I used seems too old, the newest version for it is 8.6. In my thoughts, 
I always thought those embedded packages could be automatically upgraded after 
I re-installed a newer python. However, it seems the packages are not be 
updated as expected.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41574>
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