Insightful KeyErrors

[neutrinoceros]

Hi, thanks a lot for this project, I find this amazing.

I propose adding a little info whenever KeyError is raised, mimicking the built-in dictionary class.

[codecov]

Codecov Report

Merging #28 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #28   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files          50       50           
  Lines        1236     1247   +11     
=======================================
+ Hits         1226     1237   +11     
  Misses         10       10           

Impacted Files	Coverage Δ
benedict/core/move.py	100.00% <100.00%> (ø)
benedict/dicts/keylist/keylist_dict.py	100.00% <100.00%> (ø)
benedict/dicts/keylist/keylist_util.py	100.00% <100.00%> (ø)
benedict/dicts/io/io_dict.py	100.00% <0.00%> (ø)
benedict/dicts/keypath/keypath_dict.py	100.00% <0.00%> (ø)

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[neutrinoceros]

Thanks for merging ! If you're curious, I'm pondering on the idea of using benedict for field accessing in Yt (https://github.com/yt-project/yt/)
I might have related questions and/or PRs in the future, is it okay to open issues to ask questions ?

[fabiocaccamo]

You're welcome, it will be a plaisure if you decide to use python-benedict in Yt.
Sure, feel free to open new issues and/or submit PRs.