Can't use lists in dictionaries

Question

I got a problem: I want to save lists in a dictionary like that:

EventFields: dict = {[0, 1]: 'specialField'}

Why does this not match? And what's the solution?

Thanks

You can use tuples instead of lists...so `(0, 1)` instead of `[0, 1]`. — Mark, Dec 27 '21 at 01:38
Welcome to Stack Overflow. Please read [ask] and https://meta.stackoverflow.com/questions/359146. What do you mean by "not match"? What problem are you trying to solve? While I happen to recognize what you are doing (so I could link you to a duplicate), it's important to ask questions clearly and state the actual problem. Developing this skill will also help you find answers with a search engine - whether you search for the [problem](https://duckduckgo.com/?q=TypeError%3A+unhashable+type%3A+%27list%27) or the [goal](https://duckduckgo.com/?q=python+use+list+as+dict+key). — Karl Knechtel, Dec 27 '21 at 01:38

BrokenBenchmark · Accepted Answer · 2021-12-27T01:51:03.847

0

Lists aren't hashable, since you can mutate a list (e.g. by doing something like list[0] = 1).

You would want to cast the list to a tuple:

dict = {(0, 1): 'specialField'}

edited Dec 27 '21 at 01:51

answered Dec 27 '21 at 01:39

BrokenBenchmark

Much easier to just write the tuple directly: `(0, 1)`. Also, Python doesn't really have "casts"; you are creating a new object. – Karl Knechtel Dec 27 '21 at 01:43
Fair point -- edited. – BrokenBenchmark Dec 27 '21 at 01:51

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