The simplest way to tell you is to hash and not hash

But hash is you are here python in Enter a hash( ) , The thing in the brackets that can run the result is hashable .. For example, I put a tuple in it . The operation is successful , Tuples are hashable

Another example is that I put a list in it , He made a mistake . The list is not hashable

The data types that can be hashed are ： character string , Tuples , Numbers

Non hashable ： Dictionaries , list , aggregate

The key of the dictionary must be hashable