'language_counter': Counter() TypeError: unhashable type: 'dict'

Question

I wrote this Python script

with open('survey_data/survey_results_public.csv', encoding='utf-8') as f:
    csv_reader = csv.DictReader(f)

    dev_type_info = {}

    for line in csv_reader:
        dev_types = line['DevType'].split(';')

        for dev_type in dev_types:
            dev_type_info.setdefault(dev_type_info, {
                'total': 0,
                'language_counter': Counter()
            })

but I get this error

> TypeError                                 Traceback (most recent call
> last) <ipython-input-34-0dd498f86be7> in <module>
>      14             dev_type_info.setdefault(dev_type_info, {
>      15                 'total': 0,
> ---> 16                 'language_counter': Counter()
>      17             })
> 
> TypeError: unhashable type: 'dict'

can anyone shade light upon this error, what is it and how do I solve it? Thank you

`dict` can't be key. Why are you using a dictionary as a key in itself? even if you could it doesn't make much sense. — Guy, Nov 17 '19 at 06:00
Maybe it's a data type conversion problem. See this article: http://net-informations.com/python/iq/unhashable.htm. — gsscoder, Nov 17 '19 at 06:03
Possible duplicate of [TypeError: unhashable type: 'dict'](https://stackoverflow.com/questions/13264511/typeerror-unhashable-type-dict) — AMC, Nov 17 '19 at 06:58

score 2 · Answer 1 · edited Nov 17 '19 at 06:31

2

I think you meant :

for dev_type in dev_types:
  dev_type_info.setdefault(dev_type, {
    'total': 0,
    'language_counter': Counter()
   })

as the usage for dict.setdefault is a key as the first parameter, not the dict itself.

dict.setdefault(key, default=None)

edited Nov 17 '19 at 06:31

Subhrajyoti Das

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answered Nov 17 '19 at 06:09

oppressionslayer

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score 0 · Accepted Answer · answered Nov 17 '19 at 06:01

0

You are getting this error because You're trying to use a dict as a key to another dict. Correct the below line of code:

dev_type_info.setdefault(dev_type_info, { ..

answered Nov 17 '19 at 06:01

Subhrajyoti Das

2,685
3
21
36

'language_counter': Counter() TypeError: unhashable type: 'dict'

2 Answers2