[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3431: Port test_immutable to Python 3

[Tahoe-LAFS]

#3431: Port test_immutable to Python 3
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     Reporter:  chadwhitacre  |      Owner:  chadwhitacre
         Type:  task          |     Status:  assigned
     Priority:  normal        |  Milestone:  Support Python 3
    Component:  code          |    Version:  n/a
   Resolution:                |   Keywords:
Launchpad Bug:                |
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Comment (by chadwhitacre):

 PR: https://github.com/tahoe-lafs/tahoe-lafs/pull/823

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3431#comment:3>
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