O(n²) lookup loop
A function that fetches users by id. Works on a small test list. What does a senior flag FIRST?
The snippet
# Find each user by id from a big list. Works but slow.
DB = [{"id": i, "name": f"user_{i}"} for i in range(10_000)]
def fetch_users(ids):
users = []
for id in ids:
for user in DB:
if user["id"] == id:
users.append(user)
break
return users