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Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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• process_operations(ops, tokens): Takes two lists as inputs. The first list contains mathematical operations (any of the ones in the OPERATIONS list) as strings (e.g., ['x', '/']). The second list is a list of tokens as described above (but without any parentheses). The function will execute the desired operations on the tokens, and return a new list with the result of the operations. Performing an operation means finding a group of three tokens in the list (the mathematical oper- ation and the numbers on either side of it), then performing that operation on the two numbers, and replacing the three tokens with one new token corresponding to the result of the operation. Operations should be performed from left-to-right on the tokens list. That is, if ops is ['x', '/'] and there are multiple 'x' and /' operations in the tokens list, the left-most 'x' or '/' token should be executed first, followed by the next left-most, and so on. If the list of tokens does not correspond to a valid equation (e.g., it has two operations or numbers in a row, or an operation at the start or end of the list), then return the original tokens list without performing any operations. >>> process_operations(['x'], [5, 'x', 7, '+', 2]) [35, '+', 2] >>> process operations(['x',/'1, [5, 'x', 4, /', 2]) [10]
Transcribed Image Text:• process_operations(ops, tokens): Takes two lists as inputs. The first list contains mathematical operations (any of the ones in the OPERATIONS list) as strings (e.g., ['x', '/']). The second list is a list of tokens as described above (but without any parentheses). The function will execute the desired operations on the tokens, and return a new list with the result of the operations. Performing an operation means finding a group of three tokens in the list (the mathematical oper- ation and the numbers on either side of it), then performing that operation on the two numbers, and replacing the three tokens with one new token corresponding to the result of the operation. Operations should be performed from left-to-right on the tokens list. That is, if ops is ['x', '/'] and there are multiple 'x' and /' operations in the tokens list, the left-most 'x' or '/' token should be executed first, followed by the next left-most, and so on. If the list of tokens does not correspond to a valid equation (e.g., it has two operations or numbers in a row, or an operation at the start or end of the list), then return the original tokens list without performing any operations. >>> process_operations(['x'], [5, 'x', 7, '+', 2]) [35, '+', 2] >>> process operations(['x',/'1, [5, 'x', 4, /', 2]) [10]
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