Multiply All Numbers in the List in Python (original) (raw)

Last Updated : 28 Oct, 2025

Given a list of numbers, the task is to find the product of all elements in the list. Multiplying all numbers in a list means multiplying each element together to get a single result.

**For example:

For, arr = [2, 3, 4], result is 2 × 3 × 4 = 24.
arr = [1, 5, 7, 2], result is 1 × 5 × 7 × 2 = 70.

Let’s explore different methods to multiply all numbers in the list one by one.

Using math.prod()

The **math library in Python provides the prod() function to calculate the product of each element in an **iterable.

**Note: **prod() method was added to the **math library in **Python 3.8. So, it is only available with **Python 3.8 or greater versions.

Python `

import math a = [2, 4, 8, 3] res = math.prod(a)
print(res)

`

**Explanation:

• **a = [2, 4, 8, 3]: A list of integers.
• **math.prod(a): Multiplies all elements in the list (2 * 4 * 8 * 3).
• **print(res): Outputs the result of the multiplication (192).

Using reduce() and mul()

We can use reduce() function from the functools module, which can apply a function to an iterable in a cumulative way. We can use the operator.mul() function to multiply the elements together.

Python `

from functools import reduce from operator import mul

a = [2, 4, 8, 3] res = reduce(mul, a)

print(res)

`

**Explanation:

• **a = [2, 4, 8, 3]: A list of integers.
• **reduce(mul, a): Applies the mul operator (multiplication) cumulatively to the elements of a (i.e., 2 * 4 * 8 * 3).
• **print(res): Outputs the result of the multiplication (192).

Using a loop

We can simply use a loop (for loop) to iterate over the list elements and multiply them one by one.

Python `

a = [2, 4, 8, 3] res = 1

for val in a: res = res * val

print(res)

`