list, L, the function front_two creates a new list of

C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter7: Arrays
Section7.5: Case Studies
Problem 3E
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Code in python

Given a list, L, the function front_two creates a new list of length 2 out of the first two items in L as follows:

 

  • In the new list, the second item becomes the first item, and the first item becomes the second. 
  • If L contains only one item, the first item in the new list should be the value None
  • If L is empty, both items in the new list should be value None
  • The function returns the new list.

 

For example:

Test Result
L = ['a', 'b', 'c', 'd'] print(front_two(L)) ['b', 'a']
L = [] print(front_two(L)) [None, None]
L = [5, 2] print(front_two(L)) [2, 5]
L = [7] print(front_two(L)) [None, 7]

 

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