"Why must keys be hashable? The hash function used by the interpreter to calculate where to store your data is based on the value of your key. If the key was a mutable object, its value could be changed. If a key changes, the hash function will map to a different place to store the data. If that was "
"The defining PEP (234) cites that iterators: ● Provide an extensible iterator interface. ● Bring performance enhancements to list iteration. ● Allow for big performance improvements in dictionary iteration. ● Allow for the creation of a true iteration interface as opposed to overriding methods origi"