000001 Lecture Notes - Object Copying
Document Summary
In python 3. 6 and earlier, dictionaries are unordered. the dictionary: the main operations on a dictionary are storing a value with some key and extracting the value given the key. It is also possible to delete a key : value pair with del. If you store using a key that is already in use, the old value associated with that key is forgotten. It is an error to extract a value using a non-existent key. The dict() constructor builds dictionaries directly from sequences of key-value pairs. We can also create a dictionary by using {}. dict() Updating an existing value in a dictionary can be done by using the built-in update() method. In python dictionary, the addition of elements can be done in multiple ways. One value at a time can be added to a dictionary by defining value along with the key.
