[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3417: Audit existing ported modules for del in for loops

[Tahoe-LAFS]

#3417: Audit existing ported modules for del in for loops
----------------------+----------------------------------
 Reporter:  itamarst  |          Owner:
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
----------------------+----------------------------------
 ```
 for k in d.keys():
     if something(x): del d[x]
 ```

 is a bug in Python 3.

 Easiest way to catch potential places this might be an issue is probably
 to run futurize on all ported modules, and then look at diffs.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3417>
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