How can I multiply all items in a list together with Python?

python list multiplication
user1897814 picture user1897814 · Dec 12, 2012 · Viewed 252.8k times · Source

I need to write a function that takes a list of numbers and multiplies them together. Example: [1,2,3,4,5,6] will give me 1*2*3*4*5*6. I could really use your help.

Answer

rich tier picture rich tier · Dec 12, 2012

Python 3: use functools.reduce:

>>> from functools import reduce
>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
720

Python 2: use reduce:

>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
720

For compatible with 2 and 3 use pip install six, then:

>>> from six.moves import reduce
>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
720

Related questions

How to perform element-wise multiplication of two lists?

I want to perform an element wise multiplication, to multiply two lists together by value in Python, like we can do it in Matlab. This is how I would do it in Matlab. a = [1,2,3,4] b = [2,3,4,5] a .* b = [2, 6, 12, 20] A list comprehension …

Read More
How to multiply all integers inside list

Hello so I want to multiply the integers inside a list. For example; l = [1, 2, 3] l = [1*2, 2*2, 3*2] output: l = [2, 4, 6] So I was searching online and most of the answers were regarding multiply all the integers with each other such as: [1*2*3]

Read More
Python list multiplication: [[...]]*3 makes 3 lists which mirror each other when modified

Why this is happening? I don't really understand: >>> P = [ [()]*3 ]*3 >>> P [[(), (), ()], [(), (), ()], [(), (), ()]] >>> P[0][0]=1 >>> P [[1, (), ()], [1, (), ()], [1, (), ()]]

Read More