Ned Deily <n...@python.org> added the comment:

Thank you for the report. The issue is that the necessary operating system 
support for opening with a file descriptor, openat, was only first implemented 
in macOS 10.10 (see man 2 openat) and, up until recently, all python.org macOS 
binaries were built on 10.9 (or earlier) systems for compatibility across 
multiple operating system versions. As of Python 3.9.1, we now support 
"weak-linking", that is, building on newer systems but still able to run on 
older systems. The python.org macOS universal2 installer variant, introduced in 
3.9.1, does support os.fwalk() on macOS 10.10+. (The legacy 10.9 Intel-64 only 
variant is still built on 10.9 but will be phased out by the release of Python 
3.10.)  If you build recent Python versions from source with a deployment 
target of 10.10 or later, you should also find a working os.fwalk().

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43800>
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