Expand Up @@ -500,7 +500,7 @@ on the key and a per-process seed; for example, "Python" could hash to to 1142331976. The hash code is then used to calculate a location in an internal array where the value will be stored. Assuming that you're storing keys that all have different hash values, this means that dictionaries take constant time -- O(1), in computer science notation -- to retrieve a key. constant time -- O(1), in Big-O notation -- to retrieve a key.

Why must dictionary keys be immutable? Expand Down