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Python – Product of Selective Tuple Keys

  • Last Updated : 27 Feb, 2020

Sometimes, while using list of tuples, we come across a problem in which we have certain list of keys and we just need the product of values of those keys from list of tuples. This has a utility in rating or product of specific entities. Let’s discuss certain ways in which this can be done.

Method #1 : Using dict() + loop + get() + list comprehension
We can perform this particular task by first, converting the list into the dictionary and then employing list comprehension to get the value of specific keys using get function. The product of values is performed using loop.




# Python3 code to demonstrate 
# Product of Selective Tuple Keys
# using dict() + get() + list comprehension + loop
  
# getting Product 
def prod(val) : 
    res = 1 
    for ele in val: 
        res *= ele 
    return res  
  
# initializing list of tuples 
test_list = [('Nikhil', 1), ('Akash', 2), ('Akshat', 3), ('Manjeet', 4)]
  
# initializing selection list 
select_list = ['Nikhil', 'Akshat']
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# printing selection list 
print ("The selection list is : " + str(select_list))
  
# using dict() + get() + list comprehension + loop
# Product of Selective Tuple Keys
temp = dict(test_list)
res = prod([temp.get(i, 0) for i in select_list])
  
# printing result
print ("The selective values product of keys : " + str(res))
Output :
The original list is : [('Nikhil', 1), ('Akash', 2), ('Akshat', 3), ('Manjeet', 4)]
The selection list is : ['Nikhil', 'Akshat']
The selective values product of keys : 3

 

Method #2 : Using next() + loop + list comprehension
This particular problem can be solved using the next function which performs the iteration using the iterators and hence more efficient way to achieve a possible solution. The product of values is performed using loop.






# Python3 code to demonstrate 
# Product of Selective Tuple Keys
# using next() + list comprehension + loop
  
# getting Product 
def prod(val) : 
    res = 1 
    for ele in val: 
        res *= ele 
    return res  
  
# initializing list of tuples 
test_list = [('Nikhil', 1), ('Akash', 2), ('Akshat', 3), ('Manjeet', 4)]
  
# initializing selection list 
select_list = ['Nikhil', 'Akshat']
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# printing selection list 
print ("The selection list is : " + str(select_list))
  
# using next() + list comprehension + loop
# Product of Selective Tuple Keys
res = prod([next((sub[1] for sub in test_list if sub[0] == i), 0) for i in select_list])
  
# printing result
print ("The selective values product of keys : " + str(res))
Output :
The original list is : [('Nikhil', 1), ('Akash', 2), ('Akshat', 3), ('Manjeet', 4)]
The selection list is : ['Nikhil', 'Akshat']
The selective values product of keys : 3

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