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In python, without using loops

In python, without using loops

Database System Concepts
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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In python, without using loops 

Write a function subsequences (1st) that consumes 1st which is a list of distinct values. The function returns a list of all the subsequences of 1st. A subsequence is obtained from a given list by selecting elements from the list and placing them in the order in which they occur in it. For example, [1,3,4] is a subsequence of [0,1,2,5,3,6,4,8] while [3,1,4] is not a subsequence (since 1 occurs before 3 in the list). Samples: subsequences ((0, True, "wow"]) => [[], [0], [True], [0, True], ['wow'], [0, 'wow'], [True, 'wow'], [0, True, 'wow']] subsequences ([]) => [[]] subsequences ( [44360]) => [[), [44360]] Notes: • The elements of the subsequences themselves (i.e. the elements of the outer returned list) can be in any order. For example, for the third sample above, your function may return [[44360], []] instead. • You must solve this problem using accumulative recursion. Moreover, all recursion must be accumulative.
Transcribed Image Text:Write a function subsequences (1st) that consumes 1st which is a list of distinct values. The function returns a list of all the subsequences of 1st. A subsequence is obtained from a given list by selecting elements from the list and placing them in the order in which they occur in it. For example, [1,3,4] is a subsequence of [0,1,2,5,3,6,4,8] while [3,1,4] is not a subsequence (since 1 occurs before 3 in the list). Samples: subsequences ((0, True, "wow"]) => [[], [0], [True], [0, True], ['wow'], [0, 'wow'], [True, 'wow'], [0, True, 'wow']] subsequences ([]) => [[]] subsequences ( [44360]) => [[), [44360]] Notes: • The elements of the subsequences themselves (i.e. the elements of the outer returned list) can be in any order. For example, for the third sample above, your function may return [[44360], []] instead. • You must solve this problem using accumulative recursion. Moreover, all recursion must be accumulative.
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