Good job! It's time to wrap things up. Before we do this section's quiz, let's have a quick review of what we've covered:

1. To iterate over dictionary keys, use either:

   for k in dictionary:

   or:

   for k in dictionary.keys():

2. To iterate over dictionary values, use:

   for v in dictionary.values():

3. To get both values and keys during dictionary iteration, use:

   for k, v in dictionary.items():

4. Dictionaries are often used to count elements:

   votes = [...]
   dict_results = {}
   for vote in votes:
     if vote not in dict_results:
       dict_results[vote] = 0
     dict_results[vote] += 1

5. The syntax above can be simplified to:

   votes = [...]
   dict_results = {}
   for vote in votes:
     dict_results[vote] += dict_results.get(vote, 0) + 1

6. Dictionaries are also used to group elements by a given characteristic, for instance:

   names = [...]
   groups_dict = {}
   for name in names:
     key = len(name)
     if key not in groups_dict:
       groups_dict[key] = []
     groups_dict[key].append(name)

7. You can update the values in a dictionary based on another dictionary using:

   dict_1.update(dict_2)

Great! Are you ready for the quiz?