Here are some ways to solve the problem.
Method # 1: Using the naive method
| # Python3 demo code
# multiply the numbers with position
# and add them to return num import numpy as np
# initializing list ini_list = [[ 3 , 4 , 7 ], [ 6 , 7 , 8 ], [ 10 , 7 , 5 ], [ 11 , 12 , 13 ]]
# print initial_list print ( "initial_list" , ini_list) res = [] # Using the naive method for sub_list in ini_list: sublistsum = 0 for i, value in enumerate (sub_list): sublistsum = sublistsum + i * value res.append (sublistsum)
# print result print ( "result" , res) |
Output:
initial_list [[3, 4, 7], [6, 7, 8], [10, 7, 5], [11, 12, 13]] result [18, 23, 17, 38 ]
Method # 2: Using the comprehension list
| # Python3 demo code
# multiply the numbers with position
# and add them to return num
# initializing list ini_list = [[ 3 , 4 < code class = "plain">, 7 ], [ 6 , 7 , 8 ], [ 10 , 7 , 5 ], [ 11 , 12 , 13 ]]
# print initial_list print ( "initial_list" , ini_list)
# Using comprehension list res = [ sum (i * j for i, j in enumerate (sublist)) for sublist in ini_list]
# print result print ( "result" , res) |
Exit:
initial_list [ [3, 4, 7], [6, 7, 8], [10, 7, 5], [11, 12, 13]] result [18, 23, 17, 38]
Method # 3: Using NumPy
| # Python3 demo code
# multiply the numbers with position
# and add them to return num import numpy as np
# initializing list ini_list = [[[ 3 , 4 , 7 ], [ 6 , 7 , 8 ], [ 10 , 7 , 5 ], [ 11 , 12 , 13 ]]
# print initial_list print ( "initial_list" , ini_list)
# Using NumPy res = [np.arange ( len (sublist)). dot (sublist) for sublist in ini_list]
# print result print ( " result " , res) |
Exit:
initial_list [[3, 4, 7], [6, 7, 8], [10, 7, 5], [11, 12 , 13]] result [18, 23, 17, 38]
