Commits on Jul 22, 2020

1. Use dict on py>=3.7; Improved exceptions, and mapping vs iterable …

   Details:
   
   * Starting with Python 3.7, the standard dict is guaranteed to be
     ordered on all Python implementations. Therefore, there is no
     reason to use OrderedDict anymore on py>=3.7, and the standard
     dict is faster. This change uses dict on py>=3.7 and otherwise
     OrderedDict for the implementation of NocaseDict.
   
   * The issuing of message 'During handling of the above exception,
     another exception occurred' is now suppressed by setting
     exc.__cause__ = None. This works on both Python 2 and 3.
   
   * Improved the detection of mapping vs iterable as the init
     argument by generalizing the type checking for mapping to
     be derived from (NocaseDict, Mapping, UserDict), and to expect
     an iterable otherwise, failing with TypeError when it cannot
     be iterated on.
   
   * Exception messages have been cleaned up and improved, and in
     some cases re-raised with better message. No different
     exception types are raised than before this change.
   
   * Along with the new re.-raising of exceptions, it surfaced
     that some error cases had not been tested so far, mainly
     in the area of providing iterables of tuples (key, value)
     where the tuple items did not contain exactly two items.
     Added testcases to cover these error cases.
   
   Signed-off-by: Andreas Maier <andreas.r.maier@gmx.de>

   

   andy-maier committed Jul 22, 2020
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