TypeError: unhashable type: 'list' or. The tuple is a immutable object that can be stored in dictionary or set. The reason you’re getting the unhashable type: 'list' exception is because k = list[0:j] sets k to be a “slice” of the list, which is logically another, often shorter, list. The unhashable object list can be stored in the dictionary after the list is converted to tuple. When we use a key that contains an unhashable type, i.e. Let’s assume that the “source” dictionary has string as keys and has a list of custom objects per value. Therefore, … Till now, we have seen the ways to creating dictionary in multiple ways and different operations on the key and values in dictionary.Now, let’s see different ways of creating a dictionary of list. I get. TypeError: unhashable type: 'list' Code : aTargetDictionary = {} for aKey in aSourceDictionary: a list, the underlying hash map cannot guarantee the key will map to the same bucket every single time. Python dictionaries leverage hash tables. 0 Source: alysivji.github.io. Use subscript to create a dictionary of lists. python by Splendid Stag HK on Jul 13 2020 Donate . You can add a list as a value in the dictionary. I had to comment the last part out because I managed to make it not work at all. TypeError: unhashable type: 'list' Code : This was before the holidays. On Career Karma, learn how to fix As you already know list is a mutable Python object. I don't remember what I removed. Let's assume that the "source" dictionary has a string as keys and has a list of custom objects per value. Let us first understand what is hashable and unhasable. TypeError: unhashable type: 'list' when using built-in set function , The Python TypeError: unhashable type: 'list' is raised when you try to assign a list as a key in a dictionary. In simple terms, we term the items whose values cannot be changed as hashable and the objects whose values can be changed as unhashable. TypeError: unhashable type: 'list' usually means that you are trying to use a list as an hash argument. I’m creating my target dictionary exactly as I have been creating my “source” dictionary how is it possible this is not working ? I'm creating my target dictionary exactly as I have been creating my "source" dictionary how is it possible this is not working? Quote:TypeError: unhashable type: 'list' and I have no idea what I'm doing wrong. TypeError: unhashable type: 'list' You can see that we got a TypeError: unhashable type: ‘list’. But the same can be done very wisely with values in the dictionary. What you need is to get just the first item in list, written like so k = list[0]. I know I have errors all through the code. I get . What you need is to get just the first item in list, written like so k = list[0].The same for v = list[j + 1:] which should just be v = list[2] for the third element of the list returned from the call to readline.split(" "). This is a list: If so, I'll show you the steps - how to investigate the errors and possible solution depending on the reason. The reason you’re getting the unhashable type: 'list' exception is because k = list[0:j] sets k to be a “slice” of the list, which is another, usually shorter, list. TypeError: unhashable type: 'list' python dictionary . If we can't hash our key, we can't use it in our dictionary. The tuple() function is used to convert the list … Note that the restriction with keys in Python dictionary is only immutable data types can be used as keys, which means we cannot use a dictionary of list as a key. TypeError: unhashable type: 'dict' The problem is that a list/dict can't be used as the key in a dict, since dict keys need to be immutable and unique. In list, the underlying hash map can not guarantee the key will map to the same bucket every time! 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