Question

Find the number of times a value appears in a list, and create a new list that contains the index positions where the value occurs in the list argument.

Answer 1

Program :

list_1=[]#take the empty list.

size=int(input("Enter the size of the list: "))#take the size of the list from the user

for x in range(size): #for loop which insert the elemnt on the list.

list_1.append(int(input("Enter the "+str(x+1)+" element of the list: ")))#take the user input and insert the element.

element=int(input("Enter the element to be searched: "))#it take the elemnt to search.

loc=1#intialize the location value.

count=0

for x in list_1:#for loop to check the element.

if(x==element): #check the element.

print(loc,end=", ")#print the location of the element.

count=count+1

loc=loc+1

if(count==0):

print("The element is not present on the list")#print when elemnt are not present.

Output:

• If the user input 5 for the size and 1,2,3,4,5 for the list and 5 for the element, then it will print 5.

Step-by-step explanation:

• The above code is in python language which is used to take the size for the list, then take the value to add on the list.
• Then the element is entered from the user to search on the list.
• Then the element is searched on the list with the help of for loop.
• It prints the location when the element is matched.