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Python | Custom Multiplication in a List of Lists

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Method # 1: Using Loops

This Naive and brute force method does this particular task in which we run a loop to get all the elements and its nested components and respectively multiply.

Output:

 The original list: [[5, 6, 8], [7, 4, 3], [8, 10 , 12]] The original multiply list: [10, 20, 30] The list after multiply: [[50, 60, 80], [140, 80, 60], [240, 300, 360]] 

Method # 2: Using the comprehension list + enumerate()

This problem can also be solved in a shorter way using the function enumerate to get the indexes and value of the container in one go. This is a one-line approach to solve this problem.

# Python3 demo code
# Custom Multiplication in the list of lists
# Using loops

 
# initializing list

test_list = [[ 5 , 6 , 8 ], [ 7 , 4 , 3 ], [ 8 , 10 , 12 ]]

 
# initialize the multiplication list

mult_list = [ 10 , 20 , 30 ]

 
# print original list

print ( "The original list:" + str (test_list)) 

 
# print the multiplication list

print ( "The original multiply list:" + str (mult_list))

  
# using loops
# Custom Multiplication in a list of lists

res = [[] for idx in range ( len (test_list))]

for i in range ( len (test_list)):

for j in range ( len (mult_list)):

res [i] + = [mult_list [i] * test_list [i] [j]]

 
# print result

print ( " The list after multiply: " + str (res) )

# Python3 demo code
# Custom Multiplication in the list of lists
# Using the comprehension list + enumerate ()

  
# initializing list

test_list = [[ 5 , 6 , 8 ], [ 7 , 4 , 3 ], [ 8 , 10 , 12 ]]

 
# initialize the multiplication list

mult_list = [ 10 , 20 , 30 ]

 
# print original list

print ( " The original list: " + str (test_list))

 
# print the multiplication list

print ( "The original multiply list:" + str (mult_list))

 
# using a list comprehension + enumerate ()
# Custom Multiplication in a list of lists

res = [[mult_list [i] * j for j in sub] 

  for i, sub in enumerate (test_list)]

  
# print result

print ( "The list after multiply:" + str (res))

Output:

 The original list: [[5, 6, 8], [7, 4, 3], [8, 10, 12]] The original multiply list: [10, 20, 30] The list after multiply: [[50, 60, 80] , [140, 80, 60], [240, 300, 360]] 

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