[tor-bugs] #28863 [Core Tor/Fallback Scripts]: updateFallbackDirs.py thinks it is python 3 compatible but it is not

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#28863: updateFallbackDirs.py thinks it is python 3 compatible but it is not
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 Reporter:  starlight                  |          Owner:  (none)
     Type:  defect                     |         Status:  needs_information
 Priority:  Medium                     |      Milestone:
Component:  Core Tor/Fallback Scripts  |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  fallback-ci, 043-must      |  Actual Points:
Parent ID:  #30971                     |         Points:
 Reviewer:                             |        Sponsor:
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Comment (by teor):

 I've done some research, here's what I've discovered:
 * python 2's code freeze starts on 1 January 2020, the final release will
 be around April at pycon 2020
 * if we want to continue testing using python 2 during the transition, we
 should use python-modernize or python-future, not 2to3
 * python 3.6 is the earliest supported python 3; python 3.2, 3.3, and 3.5
 added features that make porting easier
 * we should try to use `if PY2` for any code that won't run in both
 versions, in case there is a python 4 some day

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28863#comment:12>
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