
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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![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](https://content.bartleby.com/qna-images/question/3af6e284-e26c-439c-b876-eb6e39620bb5/1a0c8325-4676-42b5-bf7f-00fa477c604f/7xne3hr_thumbnail.jpeg)
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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