Python: Create a list taking alternate elements from a given list

Last update on April 19 2025 12:58:49 (UTC/GMT +8 hours)

Create List with Alternate Elements

Write a Python program to create a list taking alternate elements from a given list.

Sample Solution:

Python Code:

# Define a function 'alternate_elements' that returns a list of alternate elements from the input list
def alternate_elements(list_data):
    # Initialize an empty list 'result' to store the alternate elements
    result = []
    # Use a for loop to iterate over elements in 'list_data' with a step of 2 (alternate elements)
    for item in list_data[::2]:
        # Append the alternate element to the 'result' list
        result.append(item)
    # Return the 'result' list containing alternate elements
    return result

# Create a list 'colors' with string values
colors = ["red", "black", "white", "green", "orange"]
# Print a message indicating the original list
print("Original list:")
# Print the contents of 'colors'
print(colors)
# Print a message indicating the operation to extract alternate elements
print("List with alternate elements from the said list:")
# Call the 'alternate_elements' function with 'colors' and print the result
print(alternate_elements(colors))

# Create a list 'nums' with integer values
nums = [2, 0, 3, 4, 0, 2, 8, 3, 4, 2]
# Print a message indicating the original list
print("\nOriginal list:")
# Print the contents of 'nums'
print(nums)
# Print a message indicating the operation to extract alternate elements
print("List with alternate elements from the said list:")
# Call the 'alternate_elements' function with 'nums' and print the result
print(alternate_elements(nums))

Sample Output:

Original list:
['red', 'black', 'white', 'green', 'orange']
List with alternate elements from the said list:
['red', 'white', 'orange']

Original list:
[2, 0, 3, 4, 0, 2, 8, 3, 4, 2]
List with alternate elements from the said list:
[2, 3, 0, 8, 4]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to extract every third element from a list.
Write a Python program to interleave two lists alternately.
Write a Python program to separate even and odd indexed elements into two lists.
Write a Python program to create a list by skipping elements at specific intervals.

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