Thomas Kluyver <tho...@kluyver.me.uk> added the comment:

This is documented:

>  The destination directory, named by dst, must not already exist

https://docs.python.org/3/library/shutil.html#shutil.copytree

I guess that avoids complications that might arise from merging a directory.

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nosy: +takluyver

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<https://bugs.python.org/issue32247>
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