Python: Append the same value /a list multiple times to a list/list-of-lists

Last update on April 19 2025 12:58:31 (UTC/GMT +8 hours)

Append Value Multiple Times

Write a Python program to append the same value/a list multiple times to a list/list-of-lists.

Visual Presentation:

Sample Solution:

Python Code:

# Print a message indicating the purpose of the code.
print("Add a value(7), 5 times, to a list:")

# Create an empty list 'nums'.
nums = []

# Extend the 'nums' list by adding the value '7' five times using the '+=' operator.
nums += 5 * ['7']

# Print the resulting 'nums' list after the addition.
print(nums)

# Create a list 'nums1' containing some integer values.
nums1 = [1, 2, 3, 4]

# Print a message indicating the purpose of the code.
print("\nAdd 5, 6 times, to a list:")

# Extend the 'nums1' list by adding the value '5' six times using the '+=' operator.
nums1 += 6 * [5]

# Print the resulting 'nums1' list after the addition.
print(nums1)

# Print a message indicating the purpose of the code.
print("\nAdd a list, 4 times, to a list of lists:")

# Create an empty list 'nums1'.
nums1 = []

# Extend the 'nums1' list by adding the list [1, 2, 5] four times using the '+=' operator.
nums1 += 4 * [[1, 2, 5]]

# Print the resulting 'nums1' list after the addition.
print(nums1)

# Create a list 'nums1' containing a single list [5, 6, 7].
nums1 = [[5, 6, 7]]

# Print a message indicating the purpose of the code.
print("\nAdd a list, 4 times, to a list of lists:")

# Extend the 'nums1' list by adding the list [1, 2, 5] four times using the '+=' operator.
nums1 += 4 * [[1, 2, 5]]

# Print the resulting 'nums1' list after the addition.
print(nums1) 

Sample Output:

Add a value(7), 5 times, to a list:
['7', '7', '7', '7', '7']

Add 5, 6 times, to a list:
[1, 2, 3, 4, 5, 5, 5, 5, 5, 5]

Add a list, 4 times, to a list of lists:
[[1, 2, 5], [1, 2, 5], [1, 2, 5], [1, 2, 5]]

Add a list, 4 times, to a list of lists:
[[5, 6, 7], [1, 2, 5], [1, 2, 5], [1, 2, 5], [1, 2, 5]]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to append a given value to a list a specified number of times only if it is not already present.
• Write a Python program to append a given sublist to a list-of-lists multiple times, ensuring that duplicate inner lists are not added.
• Write a Python program to append a value to a list repeatedly, but only when the current length of the list is a prime number.
• Write a Python program to append a reversed copy of a list to a list-of-lists a specified number of times.

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