Create a list by picking an odd-index items from the first list and even index items from the second
Python Python List (Article) Python List (Program)
883
Given Input:
l1 = [3, 6, 9, 12, 15, 18, 21]
l2 = [4, 8, 12, 16, 20, 24, 28]
Expected Output:
Element at odd-index positions from list one
[6, 12, 18]
Element at even-index positions from list two
[4, 12, 20, 28]
Printing Final third list
[6, 12, 18, 4, 12, 20, 28]
Program:
list1 = [3, 6, 9, 12, 15, 18, 21]
list2 = [4, 8, 12, 16, 20, 24, 28]
res = list()
odd_elements = list1[1::2]
print("Element at odd-index positions from list one")
print(odd_elements)
even_elements = list2[0::2]
print("Element at even-index positions from list two")
print(even_elements)
print("Printing Final third list")
res.extend(odd_elements)
res.extend(even_elements)
print(res)
Output:
Element at odd-index positions from list one
[6, 12, 18]
Element at even-index positions from list two
[4, 12, 20, 28]
Printing Final third list
[6, 12, 18, 4, 12, 20, 28]
Explanation:
To access a range of items in a list, use the slicing operator :. With this operator, you can specify where to start the slicing, end, and specify the step.
For example, the expression list1[ start : stop : step] returns the portion of the list from index start to index stop, at a step size step.
- for 1st list: Start from the 1st index with step value 2 so it will pick elements present at index 1, 3, 5, and so on
- for 2nd list: Start from the 0th index with step value 2 so it will pick elements present at index 0, 2, 4, and so on
This Particular section is dedicated to Programs only. If you want learn more about Python. Then you can visit below links to get more depth on this subject.
Element at odd-index positions from list one [6, 12, 18] Element at even-index positions from list two [4, 12, 20, 28] Printing Final third list [6, 12, 18, 4, 12, 20, 28]
Program:
list1 = [3, 6, 9, 12, 15, 18, 21] list2 = [4, 8, 12, 16, 20, 24, 28] res = list() odd_elements = list1[1::2] print("Element at odd-index positions from list one") print(odd_elements) even_elements = list2[0::2] print("Element at even-index positions from list two") print(even_elements) print("Printing Final third list") res.extend(odd_elements) res.extend(even_elements) print(res)
Output:
Element at odd-index positions from list one [6, 12, 18] Element at even-index positions from list two [4, 12, 20, 28] Printing Final third list [6, 12, 18, 4, 12, 20, 28]
Explanation:
To access a range of items in a list, use the slicing operator :. With this operator, you can specify where to start the slicing, end, and specify the step.
For example, the expression list1[ start : stop : step] returns the portion of the list from index start to index stop, at a step size step.
- for 1st list: Start from the 1st index with step value 2 so it will pick elements present at index 1, 3, 5, and so on
- for 2nd list: Start from the 0th index with step value 2 so it will pick elements present at index 0, 2, 4, and so on
This Particular section is dedicated to Programs only. If you want learn more about Python. Then you can visit below links to get more depth on this subject.