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Showing content from https://mail.python.org/pipermail/python-dev/2013-July/127444.html below:

[Python-Dev] dict __contains__ raises TypeError on unhashable input

[Python-Dev] dict __contains__ raises TypeError on unhashable input [Python-Dev] dict __contains__ raises TypeError on unhashable inputEthan Furman ethan at stoneleaf.us
Sat Jul 20 01:47:36 CEST 2013
While working on issue #18508 I stumbled across this:

Traceback (most recent call last):
...
   File "/usr/local/lib/python3.4/enum.py", line 417, in __new__
     if value in cls._value2member_map:
TypeError: unhashable type: 'list'

I'll wrap it in a try-except block, but I must admit I was surprised the answer wasn't False.  After all, if the input 
is unhashable then obviously it's not in the dict; furthermore, if I were to compare the number 5 with a set() I would 
get False, not a TypeMismatch error, and dict keys are basically done by equality, the hash is just (?) a speed-up.

--
~Ethan~
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