[python] int형 list 원소들의 곱

1. traversal : for loop

   def multiplyList(myList):
     result = 1
     for x in myList:
         result = result * x
     return result

   • time complexity : O(n)
   • Auxiliary space : O(1)

2. numpy.prod

   import numpy
   list1 = [1, 2, 3]
   result1 = numpy.prod(list1)
   print(result1)

   • time complexity : O(n)
   • Auxiliary space : O(1)

3. lambda w/ numpy.array

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

   • time complexity : O(n)
   • Auxiliary space : O(1)

4. math.prod

   import math
   list1 = [1, 2, 3]
   result1 = math.prod(list1)
   print(result1)

   • time complexity : O(n)
   • Auxiliary space : O(1)

5. mul() function from operator

   from operator import *
   list1 = [1, 2, 3]
   m = 1
   
   for i in list1:
   	m = mul(i,m)
   
   print(m)

   • time complexity : O(n)
   • Auxiliary space : O(1)

참고 : https://www.geeksforgeeks.org/python-multiply-numbers-list-3-different-ways/