[tor-bugs] #27350 [Core Tor/Nyx]: Nyx -d ignores supplied file name

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#27350: Nyx -d ignores supplied file name
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 Reporter:  traumschule   |          Owner:  atagar
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Nyx  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by atagar):

 Thanks traumschule.
 [https://github.com/traumschule/nyx/commit/0a0735936bfdcd8bd13049ea1d87fd95a0b9f47d
 That] isn't quite the fix I'll be going with but close.

 In Python you should almost **never** use the **'is' keyword** since it
 does object address comparisons. Under the covers Python does aggressive
 object caching so 99% of the time it will seem to work, but occasionally
 it won't. Often when you least expect it.

 The only exception is None comparison. In that case ("if x is None") the
 'is' keyword is suggested.

 In python None, empty strings, and empty lists trustiness resolve to
 'False' so the proper fix here is...

 {{{
 if debug_dir and not os.path.exists(debug_dir):
 }}}

 Sorry about the long explanation. Just seemed a good educational
 opportunity. ;P

 > stems output still appears on the screen

 Sorry, I didn't understand this bit. Your fix corrected the stacktrace but
 you got another error?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27350#comment:3>
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