Python: Insert an element before each element of a list

Last update on June 28 2025 12:48:03 (UTC/GMT +8 hours)

Insert Element Before Each List Item

Write a Python program to insert an element before each element of a list.

Sample Solution:

Python Code:

# Define a list 'color' containing color names
color = ['Red', 'Green', 'Black']

# Print the original list 'color'
print("Original List: ", color)

# Use a list comprehension to create a new list 'color' by inserting the letter 'c' before each element in the original list
# This results in each color name being duplicated with 'c' added in front of it
# Print the updated list 'color'
color = [v for elt in color for v in ('c', elt)]
print("Updated List: ", color)

Sample Output:

Original List:  ['Red', 'Green', 'Black']
Updated List:  ['c', 'Red', 'c', 'Green', 'c', 'Black']

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to insert a given value before every element in a list dynamically.
• Write a Python program to add a prefix to every string in a list.
• Write a Python program to insert a value at every nth position in a list.
• Write a Python program to duplicate each element in a list and insert a separator between them.

Go to:

• Python Data Type List Exercises Home ↩
• Python Exercises Home ↩

Previous: Write a Python program to select the odd items of a list.
Next: Write a Python program to print a nested lists (each list on a new line) using the print() function.

Python Code Editor: