Multiply each element of a list by a number in Python | Example code

Just use a list comprehension to Multiply each element of a list by a number in Python. list comprehension is generally a more efficient way to do a for-loop.

Example Multiply each element of a list by a number in Python

Simple example code Multiplying each element of a list by a specified number (5).

my_list = [1, 2, 3, 4, 5]

new_list = [i * 5 for i in my_list]

print(new_list)

Output:

Same thing with for loop

my_list = [1, 2, 3, 4, 5]

new_list = []
for i in my_list:
    new_list.append(i * 5)

print(new_list)

Output: [5, 10, 15, 20, 25]

As an alternative way

Using the popular Pandas package:

import pandas as pd

my_list = [1, 2, 3, 4, 5]
s = pd.Series(my_list)

new_list = (s * 5).tolist()

print(new_list)

Use a NumPy array

import numpy as np

a_list = [1, 2, 3]

an_array = np.array(a_list)

res = an_array * 2

print(res)
print(type(res))

Output:

[2 4 6]
<class 'numpy.ndarray'>

Do comment if you have any doubts or suggestions on this Python list multiply code.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.