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TypeError: unhashable type: 'list' usually means that you are trying to use a list as an hash argument. This means that when you try to hash an unhashable object it will result an error. For ex. when you use a list as a key in the dictionary , this cannot be done because lists can't be hashed. The standard way to solve this issue is to cast a list to a tuple . So, in order to fix unhashable type: 'list', you'll have to change your list into tuples if you want to put them as keys in your dictionary . my_dict = {'name': 'John', tuple([1,2,3]):'values'} print(my_dict) The hash() is a built-in python method, used to return a unique number . This can be applied to any user-defined object which won’t get changed once initialized. This property is used mainly in dictionary keys .

Python has a rule that all 2.x versions will be backward compatible . The same rule applies to Python 3.x versions. However, Python does not guarantee backward compatibility between versions. Python 3 introduced several changes to the actual structure and syntax of the Python language. The whole Python community was pretty much sceptical when they received Python 3.x. Python 3.0 is fundamentally different to previous Python releases because it is the first Python release that is not compatible with older versions . Most of the things written in Python 2.x were not compatible with Python 3.x, as it did not support backward compatibility. Many applications and frameworks needed to rewritten completely due to this, hence, it was very difficult to port to Python 3.x from Python 2.x . Programmers who first learned to program in Python 2.x sometimes find the new changes difficult to adjust to, but newcomers often find that the new version of the language makes more sense.