Python – Cross Pairing in Tuple List

When it is required to perform cross pairing in a list of tuples, the ‘zip’ method, a list comprehension and the ‘==’ operator is used.

Example

Below is a demonstration of the same −

my_list_1 = [('Hi', 'Will'), ('Jack', 'Python'), ('Bill', 'Mills'), ('goodwill', 'Jill')] my_list_2 = [('Hi', 'Band'), ('Jack', 'width'), ('Bill', 'cool'), ('a', 'b')] print("The first list is : " ) print(my_list_1) print("The second list is :") print(my_list_2) my_list_1.sort() my_list_2.sort() print("The first list after sorting is ") print(my_list_1) print("The second list after sorting is ") print(my_list_2) my_result = [(a[1], b[1]) for a, b in zip(my_list_1, my_list_2) if a[0] == b[0]] print("The resultant list is : ") print(my_result)

Output

The first list is : [('Hi', 'Will'), ('Jack', 'Python'), ('Bill', 'Mills'), ('goodwill', 'Jill')] The second list is : [('Hi', 'Band'), ('Jack', 'width'), ('Bill', 'cool'), ('a', 'b')] The first list after sorting is [('Bill', 'Mills'), ('Hi', 'Will'), ('Jack', 'Python'), ('goodwill', 'Jill')] The second list after sorting is [('Bill', 'cool'), ('Hi', 'Band'), ('Jack', 'width'), ('a', 'b')] The resultant list is : [('Mills', 'cool'), ('Will', 'Band'), ('Python', 'width')]

Explanation

• Two list of tuples are defined, and displayed on the console.

• Both these lists are sorted in the ascending order, and displayed on the console.

• The two list of tuples are zipped and iterated over.

• This is done using list comprehension.

• Here, the respective elements of both the lists are compared.

• If they are equal, they are stored in a list and assigned to a variable.

• This is displayed as the output on the console.