Bug#942342: traitlets: please make the output reproducible

[Chris Lamb]

Source: traitlets
Version: 4.3.3-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: randomness toolchian
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

Hi,

Whilst working on the Reproducible Builds effort [0] we noticed
that traitlets generates non-reproducible output which is affecting
the reproducibility of other packages. For example, in nbconvert:

  -<dd><p class="first">Default: […] {'image/jpeg',</span> <span class="pre">'image/svg+xml',</span> <span class="pre">'ap
plication/pdf',</span>
  +<dd><p class="first">Default: <code class="docutils literal notranslate"><span class="pre">{'image/svg+xml',</span> <span class="pre">'application/pdf',</span>

(From https://tests.reproducible-builds.org/debian/rb-pkg/unstable/
amd64/nbconvert.html on 20191014)

This is due to it not iterating over a Set traitlet type in a
deterministic ordering when generating the "Default:" human-readable
string.

Patch attached.

  [0] https://reproducible-builds.org/


Regards,

-- 
      ,''`.
     : :'  :     Chris Lamb
     `. `'`      lamby at debian.org / chris-lamb.co.uk
       `-
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