Python | Maximum of Product Pairs in Tuple List

Sometimes, while working with data, we might have a problem in which we need to find maximum product between available pairs in list. This can be application to many problems in mathematics domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using max() + list comprehension
The combination of this functions can be used to perform this task. In this, we compute the product of all pairs and then return the max of it using max().

# Python3 code to demonstrate working of
# Maximum of Product Pairs in Tuple List
# Using list comprehension + max()

# initialize list
test_list = [(3, 5), (1, 7), (10, 3), (1, 2)]

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

# Maximum of Product Pairs in Tuple List
# Using list comprehension + max()
temp = [abs(b * a) for a, b in test_list]
res = max(temp)

# printing result
print("Maximum product among pairs : " + str(res))

Output :

The original list : [(3, 5), (1, 7), (10, 3), (1, 2)]
Maximum product among pairs : 30

Method #2 : Using max() + lambda
This is similar to above method. In this the task performed by list comprehension is solved using lambda function, providing the product computation logic. Returns the max. product pair.

# Python3 code to demonstrate working of
# Maximum of Product Pairs in Tuple List
# Using lambda + max()

# initialize list
test_list = [(3, 5), (1, 7), (10, 3), (1, 2)]

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

# Maximum of Product Pairs in Tuple List
# Using lambda + max()
res = max(test_list, key = lambda sub: sub[1] * sub[0])

# printing result
print("Maximum Product among pairs : " + str(res))

Output :

The original list : [(3, 5), (1, 7), (10, 3), (1, 2)]
Maximum product among pairs : 30