Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

So Im supposed to write Python code that implements the Horspool matching algorithm for finding a pattern in a text. We are supposed to add

So Im supposed to write Python code that implements the Horspool matching algorithm for finding a pattern in a text. We are supposed to add counters counting only key comparisons but not counting anything in the creation of the shift table. The def HorspoolMatching(pattern,text): function should return a list. Whose first element is the position of the 1st character of the first match(if no match, return -1) and whose 2nd element is the number of key comparisons. I have written Python code that passes 3 out of 6 tests. Please help fix my code so I also pass test 2,3b, and test 3c.I will put my current code and the test cases that include the correct expected results.
image text in transcribed
image text in transcribedSo if done correctly and you run def testHorspool() it will print that it passes each test. Please show the output to confirm all 6 tests pass. Test 1,3, and 3a already pass so I think it is a minor problem that Im overlooking. Thanks
RE EB Walcher Mediafools JES Functions Window Layout Help def HorspoolMatching (pattern, text): m len (pattern) n len (text) if m >n: return -1 table= [] for k in range (256): table.append (m) for k in range (m- 1): table [ord (pattern [k])) = m- k- 1 table tuple (table) k=m-1 counter=0 result=[] #to return the final output as firstMatch-0 to check if pattern occurs for the first time while kn: 41 j=m-1; flag=0 to check if comparison happens inside while loop or not while jm 0 and text(i]pattern(31: j 1: i :counter+ 1:flag 1 1 and firstMatch 0: rosult.append (i+1) firstMatch 1 Ichanges the Elag after the first mat k table [ord(text [k]) if flag"#0 and j!--1: when condition fails in line 46 itself but should be included in count counter 1 if len (result) 0: result.append (-1) result.append (counter) return result " def testcaseH (testNumber, string, text, expectedResult) actualResult = Horspoo!Matching (string, text) " if actualResultexpectedResult: print "Test", test Number, "passed." else: print "Test",testNumber, "tailed. Expected", expectedResult, "but found", actualResult

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Main Memory Database Systems

Authors: Frans Faerber, Alfons Kemper, Per-Åke Alfons

1st Edition

1680833243, 978-1680833249

More Books

Students also viewed these Databases questions