Write a program to create a list of elements. Input an element from the user that has to be inserted in the li

Programming Problems · Q6

Q. Write a program to create a list of elements. Input an element from the user that has to be inserted in the list. Also input the position at which it is to be inserted.

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Concept understanding — List Operations

A shopping list on paper is more than the items written on it — it is the things you can do with it: read the third entry, cross one out, add another at the bottom, check whether "milk" is already there. A Python list is the program's version of that paper: an ordered collection that can hold many values under one name, written in square brackets. List operations are the standard actions the language gives you for working with the whole collection or any part of it.

marks = [78, 92, 65, 88, 71]

The core operations every student must command:

Indexing — fetch one element by its position: marks[0] is 78. Counting starts at zero, so the last of five items is marks[4]. Negative indexes count from the end: marks[-1] is the last element, no matter how long the list grows.
Slicing — fetch a sub-list: marks[1:4] gives the elements at positions 1, 2 and 3. The start is included, the stop is excluded. Leaving an end open means "to the edge": marks[:3] is the first three, marks[2:] is everything from position 2 onward.
Concatenation — joining two lists with the plus sign produces a new, longer list.
Repetition — a list times an integer produces repeated copies, just as with strings: [0] * 5 builds a list of five zeros, a handy way to prepare storage.
Membership — the in and not in tests answer yes or no: 92 in marks is True. No loop needed.
Traversal — a for loop visits every element in order, which is how totals, searches and printouts are written.
Length — len(marks) reports how many elements the list currently holds. …

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insert(i, x) places x at index i and shifts the rest right (nothing is overwritten).

element  = int(input("Element : "))
position = int(input("Position: "))
lst.insert(position, element)
print(lst)

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list.insert(position, element) places the element at that index and shifts everything

after it one step right — nothing is overwritten. Read the list, the element and the position,

then one insert() call does the job.

The idea

Unlike append() (which can only add at the end) and index assignment lst[i] = x

(which replaces), insert(i, x) makes room: the element lands at index i and the old

occupants move right.

Program

# Insert an element at a given position in a list
n = int(input("How many elements? "))
lst = []
for i in range(n):
    lst.append(int(input("Enter element " + str(i + 1) + ": ")))

element  = int(input("Element to insert : "))
position = int(input("Position (index, 0 onwards): "))

lst.insert(position, element)
print("List after insertion:", lst)

Sample run

How many elements? 5
Enter element 1: 10
Enter element 2: 20
Enter element 3: 30
Enter element 4: 40
Enter element 5: 50
Element to insert : 25
Position (index, 0 onwards): 2
List after insertion: [10, 20, 25, 30, 40, 50]

Dry run of lst.insert(2, 25):

Index	Before	After
0	10	10
1	20	20
2	30	25 (inserted)
3	40	30 (shifted right)
4	50	40
5	—	50

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Q.Write a program to create a list of elements. Input an element from the user that has to be inserted in the list. Also input the position at which it is to be inserted.

The idea

Program

Sample run

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