use Syder to execute the Python code and answer the questions

Code: adict = {'a': 1, 'b': 2, 'c': 3, 4:'d'} adict['a'] = 'A' print(adict) adict['x'] = [1, 2, 3] print(adict) print(len(adict))

Questions: What happens to a dictionary when an existing key is reused? What happens when a non-existing key is used? Why can the len() function be used with dictionaries?