Multiply each element of a list by a number in Python

In this post, you will learn how to multiply each element of a list by a number in Python Programming.

Using forloop

Suppose we have given a list, and we want to multiply each element of the list by number 2. In the given example, we use the for loop and multiply each element of the list with the given number.

# Python program to multiply 
# each element of a list by a number

x_list = [4, 5, 7, 32, 23, 12, 10]

multiplied_list = [ele * 2 for ele in x_list]

print(multiplied_list)

[8, 10, 14, 64, 46, 24, 20]

Using lambda function

A lambda function is a small anonymous function which takes any number of arguments, but can only have one expression. In the given example, we asked the user to enter a number to be multiplied by the element of the given list.

# Python program to multiply 
# each element of a list by a number

num=int(input('Please enter a number: '))
 
a_list = [3, 4, 1, 34, 21, 5] 
a_list = list(map(lambda x:x*num,a_list)) 
print(a_list)

Please enter a number: 4
[12, 16, 4, 136, 84, 20]

Using a numpy ndarray

In the given example, we use the numpy.array(object) with object as a list to convert object to a NumPy array. Next, we multiply each element of the array with the given number.

import numpy as np

x_list = [2, 8, 3, 12, 19, 21, 20]

an_array = np.array(x_list)
multiplied_list = an_array * 2

print(multiplied_list)

[ 4 16  6 24 38 42 40]

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