Given two lists, l1 and l2, write a program to create a third list l3 by picking an odd-index element from the list l1 and even index elements from the list l2.
Hints: Use list slicing
l1 = [3, 6, 9, 12, 15, 18, 21] l2 = [4, 8, 12, 16, 20, 24, 28]
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]
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)
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]
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.
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.
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