Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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q1

You have been asked to write a function that supplies the "reverse lookup" name for the person associated with a phone number. This means that given a
phone number, you get the name of the person who is registered with that phone number. Write this function using parallel lists.
Complete the following functions:
1 def reverse_lookup_lists (phone_num: str, phone_numbers: list[str],
2
names: list[str]) -> str:
"""This function receives a phone number phone num, and two lists: a list
of phone numbers phone_numbers and a list of names names.
These lists are
parallel lists, so the name in position 0 of the names list is
associated with the phone number in position 0 of the phone_numbers
list, and so on.
8
9
Return the name associated with phone_num according to phone_numbers
10
and names, or an empty string if there is no match.
11
12
Precondition: len(phone_numbers)
len(names)
==
13
14
>>> reverse_lookup_lists ('416-555-6543', ['416-555-3498', \
15
'647-555-9812', '416-555-6543', '905-555-6681'], ['John A. Macdonald', \
16
'Louis Riel1', 'Canoe Head', 'Tim Horton'])
17
"Canoe Head'
18
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Transcribed Image Text:You have been asked to write a function that supplies the "reverse lookup" name for the person associated with a phone number. This means that given a phone number, you get the name of the person who is registered with that phone number. Write this function using parallel lists. Complete the following functions: 1 def reverse_lookup_lists (phone_num: str, phone_numbers: list[str], 2 names: list[str]) -> str: """This function receives a phone number phone num, and two lists: a list of phone numbers phone_numbers and a list of names names. These lists are parallel lists, so the name in position 0 of the names list is associated with the phone number in position 0 of the phone_numbers list, and so on. 8 9 Return the name associated with phone_num according to phone_numbers 10 and names, or an empty string if there is no match. 11 12 Precondition: len(phone_numbers) len(names) == 13 14 >>> reverse_lookup_lists ('416-555-6543', ['416-555-3498', \ 15 '647-555-9812', '416-555-6543', '905-555-6681'], ['John A. Macdonald', \ 16 'Louis Riel1', 'Canoe Head', 'Tim Horton']) 17 "Canoe Head' 18
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