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Python, TypeError: unhashable type: list - Stack Overflow TypeError: unhashable type: 'list' The program is meant to make an adjacency list which works fine, and then proceed to search if there is a path between vertex va and vb I used a dictionary of lists in collection defaultdict to adequately append adjacent vertex The problem is in the if clauses after the list are created at the end of the
TypeError: unhashable type: list when using built-in set function Lists have an immutable equivalent, called a 'tuple' This is how you would write a piece of code that took a list of lists, removed duplicate lists, then sorted it in reverse result = sorted(set(map(tuple, my_list)), reverse=True) Additional note: If a tuple contains a list, the tuple is still considered mutable Some examples:
Python dictionary : TypeError: unhashable type: list I'm having troubles in populating a python dictionary starting from another dictionary Let's assume that the "source" dictionary has string as keys and has a list of custom objects per value I'm
python - What makes lists unhashable? - Stack Overflow >>> { [1,2]:3 } TypeError: unhashable type: 'list' The following page gives an explanation: A list is a mutable type, and cannot be used as a key in a dictionary (it could change in-place making the key no longer locatable in the internal hash table of the dictionary) I understand why it is undesirable to use mutable objects as dictionary keys However, Python raises the same exception even
pandas . unique () TypeError: unhashable type: list For my pandas dataframe column if I use tags m_tags unique() this will through an error TypeError: unhashable type: 'list' Manually looking at the data m_tags it is in list format looks like this: