Define a function called get_predecessor() which takes a Node object and a value as parameters. The function should search the chain of nodes starting at the parameter node and returns the node which comes before the node containing the parameter value. If the parameter value is NOT in the chain of nodes or the parameter value is in the first node of the chain, the function returns None. Test: x = Node('hello') y = Node('world') z = Node('goodbye') x.set_next(y) y.set_next(z) print(get_predecessor(x, 'goodbye')) Output: world Test: x = Node('hello') y Node('world') z = Node('goodbye') x.set_next(y) y.set_next(z) print(get_predecessor(x, 'hello')) Ouput: None

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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1

Define a function called get_predecessor()
which takes a Node object and a value as
parameters. The function should search the chain of nodes starting at the parameter node and
returns the node which comes before the node containing the parameter value. If the
parameter value is NOT in the chain of nodes or the parameter value is in the first node of the
chain, the function returns None.
Test:
x = Node('hello')
y = Node('world')
z = Node('goodbye')
x.set_next(y)
y.set_next(z)
print (get_predecessor (x, 'goodbye'))
Output:
world
Test:
x= Node('hello')
y Node('world')
z = Node('goodbye')
x.set_next(y)
y.set_next(z)
print(get_predecessor(x, 'hello'))
Ouput:
None
Transcribed Image Text:Define a function called get_predecessor() which takes a Node object and a value as parameters. The function should search the chain of nodes starting at the parameter node and returns the node which comes before the node containing the parameter value. If the parameter value is NOT in the chain of nodes or the parameter value is in the first node of the chain, the function returns None. Test: x = Node('hello') y = Node('world') z = Node('goodbye') x.set_next(y) y.set_next(z) print (get_predecessor (x, 'goodbye')) Output: world Test: x= Node('hello') y Node('world') z = Node('goodbye') x.set_next(y) y.set_next(z) print(get_predecessor(x, 'hello')) Ouput: None
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