How to calculate the product of all numbers in a list in Python? (code example)

How to multiply all numbers in a list in Python and then return the product value. The following article will introduce to you three methods of multiplying all the numbers in the list and calculating the product value. I hope it will be helpful to you.

Method 1: Use traversal

to initialize the value of the variable product to 1 (not 0 Multiplying any value by 0 returns zero). Traverse to the end of the list and multiply each number by the variable product. The final value stored in the variable product is the product of all the numbers in the list.

Code example:

def multiplyList(myList) : 
    # 将列表元素一 一相乘
    product = 1
    for x in myList: 
         product = product * x  
    return product  
list1 = [1, 2, 3]  
list2 = [3, 2, 4] 
print(multiplyList(list1)) 
print(multiplyList(list2))

Output:

6
24

Method 2: Use numpy.prod()

We can use the numpy.prod() method of the numpy module to calculate the product of all the numbers in the list; it will return an integer or floating point value depending on the result of the multiplication.

Code example:

import numpy  
list1 = [2, 3, 4]  
list2 = [4, 6, 4] 
  
# 使用numpy.prod()
result1 = numpy.prod(list1) 
result2 = numpy.prod(list2) 
print(result1) 
print(result2)

Output:

24
96

Method 3: Use lambda reduce() function

Code example:

from functools import reduce 
list1 = [1, 2, 3]  
list2 = [3, 2, 4] 
result1 = reduce((lambda x, y: x * y), list1) 
result2 = reduce((lambda x, y: x * y), list2) 
print(result1) 
print(result2)

Output:

6
24

Related video tutorial recommendation: "Python Tutorial"

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