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Home/ Questions/How to fix TypeError: unhashable type: 'list' python dictionary
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Chloë Jung
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Chloë Jung
Asked: May 21, 20222022-05-21T18:59:12+00:00 2022-05-21T18:59:12+00:00In: python

How to fix TypeError: unhashable type: ‘list’ python dictionary

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Do you know why I get the error “type error unhashable type list python dictionary”? Your suggestions will be very helpful to me. Thanks.

♦ Suggestions of ITtutoria Team
When you try to hash the dictionary and it fails, PyShiboken throws a TypeError that says “unhashable type: ‘list'” so check your type arguments if they are not compatible with the expected types.

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  1. Hugo Serre
    2022-05-21T18:59:14+00:00Added an answer on May 21, 2022 at 6:59 pm
    The error you gave is due to the fact that in python, dictionary keys must be immutable types (if key can change, there will be problems), and list is a mutable type.
    ​
    Your error says that you try to use a list as dictionary key, you'll have to change your list into tuples if you want to put them as keys in your dictionary.
    ​
    According to the python doc :
    ​
    The only types of values not acceptable as keys are values containing lists or dictionaries or other mutable types that are compared by value rather than by object identity, the reason being that the efficient implementation of dictionaries requires a key’s hash value to remain constant
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