Python Program: Creating lists with gaps using ellipsis

Last update on April 23 2025 12:57:26 (UTC/GMT +8 hours)

4. List with Gaps via Ellipsis

Write a Python program that creates a list containing numbers from 1 to 10, but leaves a gap at even positions using ellipsis.

Sample Solution:

Code:

print("Containing numbers from 1 to 10, but leaves a gap at even positions:")
nums = [i if i % 2 != 0 else ... for i in range(1, 11)]
print(nums)
print("\nContaining numbers from 10 to 20, but leaves a gap at odd positions:")
nums = [i if i % 2 == 0 else ... for i in range(10, 21)]
print(nums)

Output:

Containing numbers from 1 to 10, but leaves a gap at even positions:
[1, Ellipsis, 3, Ellipsis, 5, Ellipsis, 7, Ellipsis, 9, Ellipsis]

Containing numbers from 10 to 20, but leaves a gap at odd positions:
[10, Ellipsis, 12, Ellipsis, 14, Ellipsis, 16, Ellipsis, 18, Ellipsis, 20]

In the code above, we use a list comprehension to iterate through numbers from 1 to 10. If the number is odd, it's included in the list as is. However, if it's even, we use the ellipsis (...) to represent the gap.

Next, we use a list comprehension to iterate through numbers from 10 to 20. If the number is even, it's included in the list as is. However, if it's odd, we use the ellipsis (...) to represent the gap.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to create a list of numbers from 1 to 10 and replace every element at an even index with Ellipsis.
Write a Python script to build a list from 1 to 10 that leaves gaps at even positions by inserting Ellipsis, then print the final list.
Write a Python function that constructs a list of numbers 1 to 10 with Ellipsis in every second position, and then returns the list.
Write a Python program to generate a list from 1 to 10 where even-indexed positions are set to Ellipsis, and then iterate through the list printing each element.

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