Python | Record Index Product

Sometimes, while working with records, we can have a problem in which we need to multiply all the columns of a container of lists which are tuples. This kind of application is common in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop + list comprehension + zip()
This task can be performed using combination of above functions. In this, we cummulate the like index elements, i.e columns using zip(), and then iterate through them using list comprehension and perform product using explicit function.

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# Python3 code to demonstrate working of
# Record Index Product
# using list comprehension + loop + zip()
  
# getting Product
def prod(val) :
    res = 1 
    for ele in val:
        res *= ele
    return res 
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Record Index Product
# using list comprehension + loop + zip()
res = [prod(ele) for ele in zip(*test_list)]
  
# printing result
print("The Cummulative column product is : " + str(res))

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Output :



The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column product is : [6, 84, 144]

 

Method #2 : Using zip() + map() + loop
This method is similar to the above method. In this, the task performed by list comprehension is performed by map(), which extends the product of columns to zipped elements.

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code

# Python3 code to demonstrate working of
# Record Index Product
# using zip() + map() + loop
  
# getting Product
def prod(val) :
    res = 1 
    for ele in val:
        res *= ele
    return res 
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Record Index Product
# using zip() + map() + loop
res = list(map(prod, zip(*test_list)))
  
# printing result
print("The Cummulative column product is : " + str(res))

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Output :

The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column product is : [6, 84, 144]


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