Return a list containing all pairs of distinct elements that satisfy the function fn. We say the pair [a, b] satisfies a functionfn when calling fn(a, b) returns True. Also note that the pair [1, 1] should never be included in the final pairing sinceits elements are not distinct.For example, all the possible pairs with disinct elements of [1, 2, 3] are [1, 2], [1, 31, [2, 1], [2, 3], [3, 1],[3, 2] but only [1, 2], [2, 1], [2, 3], [3, 2] satisfy the condition that the sum of their elements is odd.Assume that all elements of 1st are distinct.>>> 1st = [1, 2, 3]>>> def sum_to_odd (a, b):***return (a + b) % 2 == 1>>> match_pairs (lst, sum_to_odd) # pairs can be returned in any order, this is an example[[1, 2], [2, 1], [2, 3], [3, 2]]More examples can be found in the doctests.def match_pairs (lst, fn):>>> 1st = ["bobby", "frodo", "sally", "kyoko", "beth"]>>> def same_last_char(a, b):return a[-1]== b[-1]>>> sorted (match_pairs(lst, same_last_char)) # sorted is used for testing[['bobby', 'sally'], ['frodo', 'kyoko'], ['kyoko', 'frodo'], ['sally', 'bobby']]>>> def same_first_char(a, b):return a [0] == b[0]>>> sorted (match_pairs(lst, same_first_char))[['beth', 'bobby'], ['bobby', 'beth']]||||||||||||"*** YOUR CODE HERE ***"

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Return a list containing all pairs of distinct elements that satisfy the function fn. We say the pair [a, b] satisfies a function fn when calling fn(a, b) returns True. Also note that the pair [1, 1] should never be included in the final pairing since its elements are not distinct. For example, all the possible pairs with disinct elements of [1, 2, 3] are [1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2] but only [1, 2], [2, 1], [2, 3], [3, 2] satisfy the condition that the sum of their elements is odd. Assume that all elements of 1st are distinct.

Return a list containing all pairs of distinct elements that satisfy the function fn. We say the pair [a, b] satisfies a function fn when calling fn(a, b) returns True. Also note that the pair [1, 1] should never be included in the final pairing since its elements are not distinct. For example, all the possible pairs with disinct elements of [1, 2, 3] are [1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2] but only [1, 2], [2, 1], [2, 3], [3, 2] satisfy the condition that the sum of their elements is odd. Assume that all elements of 1st are distinct.

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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Concept explainers

Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.

Question

Return a list containing all pairs of distinct elements that satisfy the function fn. We say the pair [a, b] satisfies a function
fn when calling fn(a, b) returns True. Also note that the pair [1, 1] should never be included in the final pairing since
its elements are not distinct.
For example, all the possible pairs with disinct elements of [1, 2, 3] are [1, 2], [1, 31, [2, 1], [2, 3], [3, 1],
[3, 2] but only [1, 2], [2, 1], [2, 3], [3, 2] satisfy the condition that the sum of their elements is odd.
Assume that all elements of 1st are distinct.
>>> 1st = [1, 2, 3]
>>> def sum_to_odd (a, b):
***
return (a + b) % 2 == 1
>>> match_pairs (lst, sum_to_odd) # pairs can be returned in any order, this is an example
[[1, 2], [2, 1], [2, 3], [3, 2]]
More examples can be found in the doctests.
def match_pairs (lst, fn):
>>> 1st = ["bobby", "frodo", "sally", "kyoko", "beth"]
>>> def same_last_char(a, b):
return a[-1]
== b[-1]
>>> sorted (match_pairs(lst, same_last_char)) # sorted is used for testing
[['bobby', 'sally'], ['frodo', 'kyoko'], ['kyoko', 'frodo'], ['sally', 'bobby']]
>>> def same_first_char(a, b):
return a [0] == b[0]
>>> sorted (match_pairs(lst, same_first_char))
[['beth', 'bobby'], ['bobby', 'beth']]
||||||
||||||
"*** YOUR CODE HERE ***"

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