[tor-bugs] #33825 [Core Tor/Chutney]: Make Environ handle "in" and "get()" like a dict

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#33825: Make Environ handle "in" and "get()" like a dict
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 Reporter:  teor                                 |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:
Component:  Core Tor/Chutney                     |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, outreachy-ipv6, technical-     |  Actual Points:
  debt                                           |
Parent ID:  #33050                               |         Points:  1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor55-can
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Comment (by teor):

 For "in" (and "not in"), the object should define `__contains__()`, see:
 https://docs.python.org/3.7/reference/expressions.html#membership-test-
 operations
 https://docs.python.org/3.7/reference/datamodel.html#object.__contains__

 The easiest way to implement all the standard dict functions is to inherit
 from the MutableMapping abstract base class:
 https://docs.python.org/3.7/library/collections.abc.html

 If we define these functions, all other functions are implemented by the
 base class mixins:
 {{{
 __getitem__
 __setitem__
 __delitem__
 __iter__
 __len__
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33825#comment:2>
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