[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3989: The `tenacity` dependency costs a lot and brings a little

[Tahoe-LAFS]

#3989: The `tenacity` dependency costs a lot and brings a little
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 We use `tenacity` in just one place, `test_iputil.py`, for a function that
 we should probably mostly throw away anyway.

 The functionality we use from tenacity can be re-implemented in 19 lines
 (not counting docs / whitespace).

 Tenacity is not very big but it has packaging complications on PyPy and
 it's easier to re-implement its functionality than fix the packaging
 issues.

 Let's drop the dependency.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3989>
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