Python Dict vs DefaultDict | Dataford Interview Questions

What is the difference between dict and defaultdict?

Explain the difference through a practical frequency-counting function. Implement count_items(items), which accepts a list of strings and returns a regular dictionary mapping each distinct string to its count. Your implementation should demonstrate why defaultdict(int) can simplify counting compared with a standard dict.

Constraints

0 <= len(items) <= 10^4
Every item is a string
Item strings may repeat
Return a regular dictionary

Function Signature

def count_items(items):

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Problem

What is the difference between dict and defaultdict?

Constraints

0 <= len(items) <= 10^4
Every item is a string
Item strings may repeat
Return a regular dictionary

Function Signature

def count_items(items):

Your question is Python Dict vs DefaultDict. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.