Your phone is ringing, and the phone book is name to number. Write whose_number(book, number) to return who has that number, or "unknown" if no one in the book does.
whose_number({"Mom": "5551234", "Kai": "5559876"}, "5559876")→'Kai'whose_number({"Mom": "5551234", "Kai": "5559876"}, "5550000")→'unknown'def whose_number(book, number):
for name, phone in book.items():
# your code here: if the number matches, return the name
pass
return "unknown"
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