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Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought

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To kbtyo <ahlusar.ahluwalia@gmail.com>
cc python-list@python.org, lac@openend.se
From Laura Creighton <lac@openend.se>
Subject Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought
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Comments In-reply-to kbtyo <ahlusar.ahluwalia@gmail.com> message dated "Sun, 30 Aug 2015 09:35:20 -0700."
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When you get TypeError: unhashable type: 'dict'
it almost always means that you are trying to use a dict as
a key for a different dict.


Python 2.7.10 (default, Jul  1 2015, 10:54:53)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> d={1:'one', 2:'two', 3:'three'}
 >>> d1={1:'A', 2:'B', 3:'C'}

 This doesn't work.
 
 >>> print d1[d]
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: unhashable type: 'dict'

This does.

 >>> for index in d:
   ...     print d1[index]
   ...
   A
   B
   C

HTH,
Laura

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TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-29 19:05 -0700
  Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-08-30 03:47 +0100
    Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 09:35 -0700
      Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought Laura Creighton <lac@openend.se> - 2015-08-30 19:24 +0200
        Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 10:34 -0700
          Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought Laura Creighton <lac@openend.se> - 2015-08-30 20:20 +0200
            Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 14:47 -0700
  Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought MRAB <python@mrabarnett.plus.com> - 2015-08-30 03:48 +0100
    Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 09:31 -0700
      Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought MRAB <python@mrabarnett.plus.com> - 2015-08-30 18:15 +0100
        Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 10:21 -0700
  Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought Ben Finney <ben+python@benfinney.id.au> - 2015-08-30 13:04 +1000
    Re: TypeError: unhashable type: 'dict' when attempting to hash list - advice sought kbtyo <ahlusar.ahluwalia@gmail.com> - 2015-08-30 10:02 -0700

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