[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3013: Update try/except syntax for python3 compatibility

[Tahoe-LAFS]

#3013: Update try/except syntax for python3 compatibility
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 Reporter:  heartsucker  |          Owner:
     Type:  defect       |         Status:  new
 Priority:  normal       |      Milestone:  Support Python 3
Component:  unknown      |        Version:  1.12.1
 Keywords:               |  Launchpad Bug:
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 Instances of `except SomeError, e:` need to be updated to `except
 SomeError as e:`

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3013>
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