[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3045: port Error handling

[Tahoe-LAFS]

#3045: port Error handling
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 Reporter:  hf           |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  Support Python 3
Component:  unknown      |        Version:  1.12.1
 Keywords:  Python3      |  Launchpad Bug:
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 Raising and catching exceptions needs to be ported to Python3.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3045>
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