[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2249: Installed distribution Twisted 12.2.0 [for example] conflicts with requirement twisted>=13.0 of nevow 0.11.1

[Tahoe-LAFS]

#2249: Installed distribution Twisted 12.2.0 [for example] conflicts with
requirement twisted>=13.0 of nevow 0.11.1
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  warner
  nihraguk               |     Status:  new
         Type:  defect   |  Milestone:  1.11.0
     Priority:  normal   |    Version:  1.10.0
    Component:           |   Keywords:  mac osx debian windows packaging
  packaging              |  twisted nevow
   Resolution:           |
Launchpad Bug:           |
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Comment (by zooko):

 I had a question about whether to use
 {{{pkg_resources.require('pyOpenSSL')}}} or {{{import OpenSSL;
 OpenSSL.__version__}}}. The latter has a side-effect of importing ''some''
 version of pyOpenSSL and adding it into {{{sys.modules}}}, which may
 corrupt the subsequent attempts to acquire, build, install a possibly
 different version of {{{pyOpenSSL}}}. But Daira says that the former is
 buggy and gives incorrect answers.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2249#comment:22>
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