Create or append to a list in a dictionary - can this be shortened?

Question

Can this Python code be shortened and still be readable using itertools and sets?

result = {}
for widget_type, app in widgets:
    if widget_type not in result:
         


        

Answer 1

You can use a defaultdict(list).

from collections import defaultdict

result = defaultdict(list)
for widget_type, app in widgets:
    result[widget_type].append(app)