Python – Append given number with every element of the list

When you need to add a specific number to every element in a list, Python offers several approaches. The most common method uses list comprehension, which provides a concise and readable solution.

Using List Comprehension

List comprehension allows you to create a new list by applying an operation to each element ?

numbers = [25, 36, 75, 36, 17, 7, 8, 0]

print("Original list:")
print(numbers)

append_value = 6
result = [x + append_value for x in numbers]

print("List after appending", append_value, "to each element:")
print(result)

Original list:
[25, 36, 75, 36, 17, 7, 8, 0]
List after appending 6 to each element:
[31, 42, 81, 42, 23, 13, 14, 6]

Using map() Function

The map() function applies a function to every element in the list ?

numbers = [10, 20, 30, 40]
append_value = 5

result = list(map(lambda x: x + append_value, numbers))

print("Original list:", numbers)
print("Modified list:", result)

Original list: [10, 20, 30, 40]
Modified list: [15, 25, 35, 45]

Using for Loop

A traditional approach using a for loop to iterate and modify each element ?

numbers = [1, 2, 3, 4, 5]
append_value = 10
result = []

for num in numbers:
    result.append(num + append_value)

print("Original list:", numbers)
print("Modified list:", result)

Original list: [1, 2, 3, 4, 5]
Modified list: [11, 12, 13, 14, 15]

Comparison

Conclusion

List comprehension is the most Pythonic way to append a number to every element in a list. Use map() for functional programming approaches or for loops when you need more complex logic.