[Bug 267161] devel/py-ipykernel: 6.16.0 fails to run: No module named ipykernel_launcher

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267161

            Bug ID: 267161
           Summary: devel/py-ipykernel: 6.16.0 fails to run: No module
                    named ipykernel_launcher
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: p5B2EA84B3@t-online.de
          Assignee: sunpoet@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)
 Attachment #237425 text/plain
         mime type:

Created attachment 237425
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=237425&action=edit
Poudriere build log

Trying to run a jupyter notebook fails:

[I 21:51:56.581 NotebookApp] Jupyter Notebook 6.4.12 is running at:
[I 21:51:56.581 NotebookApp] http://localhost:8888/
[I 21:51:56.582 NotebookApp] Use Control-C to stop this server and shut down
all kernels (twice to skip confirmation).
[I 21:52:26.329 NotebookApp] Kernel started:
139bae2f-cf77-4145-9331-86bab9880f5c, name: python3
/usr/local/bin/python3.9: No module named ipykernel_launcher
[W 21:52:28.491 NotebookApp] 404 GET
/nbextensions/widgets/notebook/js/extension.js?v=20221017215155 (127.0.0.1)
55.280000ms referer=None
[I 21:52:29.254 NotebookApp] KernelRestarter: restarting kernel (1/5), new
random ports
/usr/local/bin/python3.9: No module named ipykernel_launcher
[I 21:52:32.490 NotebookApp] KernelRestarter: restarting kernel (2/5), new
random ports
/usr/local/bin/python3.9: No module named ipykernel_launcher
[I 21:52:36.128 NotebookApp] KernelRestarter: restarting kernel (3/5), new
random ports
/usr/local/bin/python3.9: No module named ipykernel_launcher
[I 21:52:39.447 NotebookApp] KernelRestarter: restarting kernel (4/5), new
random ports
/usr/local/bin/python3.9: No module named ipykernel_launcher
[I 21:52:42.500 NotebookApp] KernelRestarter: restarting kernel (5/5), new
random ports
/usr/local/bin/python3.9: No module named ipykernel_launcher
[W 21:52:45.559 NotebookApp] KernelRestarter: restart failed
[W 21:52:45.560 NotebookApp] Kernel 139bae2f-cf77-4145-9331-86bab9880f5c died,
removing from map.
[W 21:52:49.311 NotebookApp] Replacing stale connection:
139bae2f-cf77-4145-9331-86bab9880f5c:248ee85eb94c4e619e03ad08694bec92

Searching for the missing ipykernel_launcher:
# find /usr/local/lib/python3.9/site-packages -name "ipykernel_launcher*"
finds nothing.
Searching in poudriere build log for ipykernel_launcher also results to nothing
found.

See https://github.com/jupyter/notebook/issues/5738

Remark: py39-ipykernel5 worked.

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