Given a list of [last-name, first-name] entries, return a dictionary mapping

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Using for loop and if else statement
def lastname_dict(names: List [List [str]]) -> Dict [str, List[str]]:
"""Given a list of [last-name, first-name] entries, return a dictionary mapping
last-names to the list of first-names with that last-name.
>> lastname_dict([ ["Universe", "Steven"], ["Universe", "Greg"], \
["Loot", "Mike"]])
{'Universe': ['Steven', 'Greg'], 'Loot': ['Mike']}
II III
Transcribed Image Text:def lastname_dict(names: List [List [str]]) -> Dict [str, List[str]]: """Given a list of [last-name, first-name] entries, return a dictionary mapping last-names to the list of first-names with that last-name. >> lastname_dict([ ["Universe", "Steven"], ["Universe", "Greg"], \ ["Loot", "Mike"]]) {'Universe': ['Steven', 'Greg'], 'Loot': ['Mike']} II III
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