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Using defaultdict to handle key not in dict
Posted on 02 Sep, 2021
We can use defauldict to eliminate the use of an if condition when looking up keys
from collections import defaultdict
​
users = [
{"username": "Jenna", "language": "English"},
{"username": "Michael", "language": "French"},
{"username": "Gustavo", "language": "Spanish"},
{"username": "Bhupesh", "language": "English"},
]
​
# normal approach
users_by_language = {}
​
for user in users:
if user["language"] not in users_by_language:
users_by_language[user["language"]] = []
users_by_language[user["language"]].append(user)
​
print(users_by_language)
​
​
# defaultdict approach
users_by_language = defaultdict(list)
​
for user in users:
users_by_language[user["language"]].append(user)
​
print(dict(users_by_language))
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