Answered: Complete the reverse_list() function…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Complete the reverse_list() function that returns a new string list containing all contents in the parameter but in reverse order.

Ex: If the input list is:

['a', 'b', 'c']

then the returned list will be:

['c', 'b', 'a']

Note: Use a for loop. DO NOT use reverse() or reversed().

This is my code so far:

def reverse_list(letters):
for x in (letters):
letters.sort(reverse=True)
return letters
if __name__ == '__main__':
ch = ['a', 'b', 'c']
print(reverse_list(ch)) # Should print ['c', 'b', 'a']

When submitting I get 4/10 and it says:

Test input list ['a', 'b', 'c'] returns ['c', 'b', 'a']

Your output

reverse_list() function reversed array incorrectly: ['c', 'b', 'a'] reverse_list() function should have returned: ['a', 'b', 'c']

Test input list ['a', 'b', 'c', 'd'], first element of returned list is ['d']

Your output

First character of returned array should be a instead of d

Test empty input array

TypeError: object of type 'NoneType' has no len()

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