appending objects to a list contained in a dictionary python 1

appending objects to a list contained in a dictionary python

dates_dict.setdefault(key, []).append(date)

Here is what the above code is Doing:
1. We create a dictionary called dates_dict.
2. We loop through the list of dates.
3. We create a key for each date by using the date’s year and month.
4. We add the date to the list of dates for that key.

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