Hello, I need a linear search function added to this code including the running time for this function. This code is taken from chegg. (python)

import timeit """ Selection sort function which sorts using given parameter index """ def selection_sort(records, ind): n = len(records) for i in range(n): min = i for j in range(i+1,n,1): if records[j][ind] < records[min][ind] : min = j records[i], records[min] = records[min], records[i] """ Insertion sort function which sorts using given parameter index """ def insertion_sort(records, ind): n = len(records) for i in range(1, n, 1): j = i-1 key = records[i][ind] while j>=0 and records[j][ind] >key : records[j+1][ind] = records[j][ind] j -= 1 records[j+1][ind] = key """ Bubble sort function which sorts using given parameter index """ def bubble_sort(records, ind): n = len(records) for i in range(n): swapped = False for j in range(0,n-i-1,1): if records[j][ind] > records[j+1][ind] : records[j][ind] , records[j+1][ind] = records[j+1][ind], records[j][ind] swapped = True if not swapped : break """ Merge function to help MergeSort """ def merge(records, low, mid, high, ind): left_arr = records[low:mid+1] right_arr = records[mid+1:high+1] i=0 j=0 for k in range(low,high+1,1): if left_arr[i][ind] <= right_arr[j][ind]: records[k] = left_arr[i] i+=1 else: records[k] = right_arr[j] j+=1 if(i == len(left_arr)): for temp in range(k+1, high+1, 1): records[temp] = right_arr[j] j += 1 break elif(j == len(right_arr)): for temp in range(k+1, high+1, 1): records[temp] = left_arr[i] i += 1 break """ Merge sort function which sorts using given parameter index """ def merge_sort(records ,low, high, ind): if low 
please use this data for student_data.txt file, this represents the student id, first name, last name, email, and major for 20 students. 
 
  1,742,abc,def,abc@gml.com,physics 
 
 2,460,jkl,nfs,jkl@gml.com,biology 
 
 3,304,bla,rav,bla@gml.com,cse 
 
 4,120,utz,ajf,utz@gml.com,math 
 
 5,052,bwk,ydm,bwk@gml.com,chemistry 
 
 6,104,rlz,gia,rlz@gml.com,eee 
 
 7,052,gpa,alr,gpa@gml.com,physics 
 
 8,469,slz,gra,slz@gml.com,math 
 
 9,350,mad,raf,mad@gml.com,biology 
 
10,018,fla,rgi,fla@gml.com,cse 
 
11,502,oga,emz,oga@gml.com,math 
 
12,311,pra,doz,pra@gml.com,eee 
 
13,451,pea,zue,pea@gml.com,ist 
 
14,014,brl,urx,brl@gml.com,economics 
 
15,183,pgs,tha,pgs@gml.com,finance 
 
16,401,uah,bha,uah@gml.com,physics 
 
17,362,pts,gys,pts@gml.com,math 
 
18,272,gps,hgs,gps@gml.com,economics 
 
19,528,xhy,pjs,xhy@gml.com,biology 
 
20,254,mea,sfu,mea@gml.com,physics