[issue2639] shutil.copyfile() documentation is vague

[Roy Smith]

Roy Smith <roy at panix.com> added the comment:

Reading closer, I see that copy() has the shell-like semantics I was 
expecting copyfile() to have.  Perhaps the right fix is to include a note in 
the copyfile() docs saying, "dst must be a file path; see also copy() for a 
version which allows dst to be a directory".

It might also make sense to move copy() to the top of the list, because it 
is the one which has the most shell-like semantics.

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