Multiply Two Lists in Python

Multiply Two List in Python Using the
zip()
Method 
Multiply Two Lists in Python Using the
numpy.multiply()
Method 
Multiply Two Lists in Python Using the
map()
Function
This tutorial will demonstrate various methods to perform elementwise multiplication of two lists in Python. Suppose we have two lists of integers with the same dimensions and we want to multiply elements of the first list with the elements at the same position in the second list and get a resultant list with the same dimensions.
Multiply Two List in Python Using the zip()
Method
The builtin zip()
method in Python takes one or more iterables and aggregates the iterables into a tuple. Like the lists [1,2,3]
and [4,5,6]
will become [(1, 4), (2, 5), (3, 6)]
. Using the map()
method, we access both lists elementwise and get the required list using the list comprehension method.
The below code example shows how to multiple 1D and 2D lists using zip()
with the list comprehension.
list1 = [2,4,5,3,5,4]
list2 = [4,1,2,9,7,5]
product = [x*y for x,y in zip(list1,list2)]
print(product)
Output:
[8, 4, 10, 27, 35, 20]
Multiplication of 2D Lists:
list1 = [[2,4,5],[3,5,4]]
list2 = [[4,1,2],[9,7,5]]
product = [[0]*3]*2
for x in range(len(list1)):
product[x] = [a*b for a,b in zip(list1[x],list2[x])]
print(product)
Output:
[[8, 4, 10], [27, 35, 20]]
Multiply Two Lists in Python Using the numpy.multiply()
Method
The multiply()
method of the NumPy
library in Python, takes two arrays/lists as input and returns an array/list after performing elementwise multiplication. This method is straightforward, as we do not have to do any extra work for 2D multiplication, but the negative point of this method is that it can’t be used without the NumPy
library.
The below code examples demonstrates how to multiply 1D and 2D lists in Python using the numpy.multiply()
method.
 1D multiplication:
import numpy as np
list1 = [12,3,1,2,3,1]
list2 = [13,2,3,5,3,4]
product = np.multiply(list1,list2)
print(product)
Output:
[156 6 3 10 9 4]
 2D multiplication:
import numpy as np
list1 = [[12,3,1],[2,3,1]]
list2 = [[13,2,3],[5,3,4]]
product = np.multiply(list1,list2)
print(product)
Output:
[[156 6 3]
[ 10 9 4]]
Multiply Two Lists in Python Using the map()
Function
The map
function takes a function and one or more iterables as input and returns an iterable applying the provided function on the input lists.
We can perform 1D and 2D elementwise multiplication of two lists in Python using the map()
function by passing both lists as the arguments to the map()
function. The below code examples demonstrate how we can use the map()
to multiply two Python lists.
Example code for 1D multiplication:
list1 = [2,4,5,3,5,4]
list2 = [4,1,2,9,7,5]
product = list(map(lambda x,y: x*y ,list1,list2))
print(product)
Output:
[8, 4, 10, 27, 35, 20]
Example code for 2D multiplication:
list1 = [[2,4,5],[3,5,4]]
list2 = [[4,1,2],[9,7,5]]
product = [[0]*3]*2
for x in range(len(list1)):
product[x] = list(map(lambda a,b: a*b ,list1[x],list2[x]))
print(product)
Output:
[[8, 4, 10], [27, 35, 20]]