[tor-bugs] #33193 [Core Tor/Tor]: Travis CI: Use flake8 to find Python syntax errors

[Tor Bug Tracker & Wiki]

#33193: Travis CI: Use flake8 to find Python syntax errors
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     Reporter:  teor          |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.4.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  extra-review
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Here's a PR from a new contributor:
 https://github.com/torproject/tor/pull/1686

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33193>
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