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Python | Tuple list cross multiplication
  • Last Updated : 29 Dec, 2019

Sometimes, while working with Python records, we can have a problem in which we need to perform cross multiplication of list of tuples. This kind of application is popular in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension + zip()
The combination of the above functionalities can be used to perform this particular task. In this, we iterate through the list using list comprehension and the multiplication across lists is performed with the help of zip().




# Python3 code to demonstrate working of
# Tuple list cross multiplication
# using list comprehension + zip()
  
# initialize lists
test_list1 = [(2, 4), (6, 7), (5, 1)]
test_list2 = [(5, 4), (8, 10), (8, 14)]
  
# printing original lists
print("The original list 1 : " + str(test_list1))
print("The original list 2 : " + str(test_list2))
  
# Tuple list cross multiplication
# using list comprehension + zip()
res = [(x[0] * y[0], x[1] * y[1]) for x, y in zip(test_list1, test_list2)]
  
# printing result
print("The multiplication across lists is : " + str(res))
Output :
The original list 1 : [(2, 4), (6, 7), (5, 1)]
The original list 2 : [(5, 4), (8, 10), (8, 14)]
The multiplication across lists is : [(10, 16), (48, 70), (40, 14)]

 

Method #2 : Using loop + zip() + map()
This is yet another way to perform this task. This is similar to above method, the difference is that multiplication is performed by explicit function and extending logic to each element is done by map().






# Python3 code to demonstrate working of
# Tuple list cross multiplication
# using max() + zip() + loop
  
# getting Product
def prod(val) :
    res = 1 
    for ele in val:
        res *= ele
    return res 
  
# initialize lists
test_list1 = [(2, 4), (6, 7), (5, 1)]
test_list2 = [(5, 4), (8, 10), (8, 14)]
  
# printing original lists
print("The original list 1 : " + str(test_list1))
print("The original list 2 : " + str(test_list2))
  
# Tuple list cross multiplication
# using max() + zip() + loop
res = [tuple(map(prod, zip(a, b))) for a, b in zip(test_list1, test_list2)]
  
# printing result
print("The multiplication across lists is : " + str(res))
Output :
The original list 1 : [(2, 4), (6, 7), (5, 1)]
The original list 2 : [(5, 4), (8, 10), (8, 14)]
The multiplication across lists is : [(10, 16), (48, 70), (40, 14)]

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