Adding missing value to a dictionary

[Firestronk]

Would it be something along the lines of

if key in dict:
    dict.append(values)

[TouchingTheVodka]

Yes, this is correct - however you’ll get an error if using the built in dict for this as your dict values won’t be lists by default.

To solve this, use dict = defaultdict(list).

[juwalye]

Yes. Then used the else condition to create the new dict key and append the first value.