Python - Make pair from two list such that elements are not same in pairs

In this article, we are going to learn how to make pairs from two lists such that no similar elements make a pair. Follow the below steps to solve the problem.

• Initialize the lists with elements.
• Iterate over the lists and append the pair into a list if the corresponding elements from the lists are not same.
• Print the result.

Example

Let's see the code.

# initializing the lists
list_1 = [1, 2, 3, 4, 5]
list_2 = [5, 8, 7, 1, 3, 6]

# making pairs
result = [(i, j) for i in list_1 for j in list_2 if i != j]

# printing the result
print(result)

If you run the above code, then you will get the following result.

Output

[(1, 5), (1, 8), (1, 7), (1, 3), (1, 6), (2, 5), (2, 8), (2, 7), (2, 1), (2, 3), (2, 6), (3, 5), (3, 8), (3, 7), (3, 1), (3, 6), (4, 5), (4, 8), (4, 7), (4, 1), (4, 3), (4, 6), (5, 8), (5, 7), (5, 1), (5, 3), (5, 6)]

We can solve the problem with itertools module as well. It provides a method called product that makes pairs of all the elements. We can filter the pairs after finding the pairs.

Example

Let's see the code.

# importing the module
import itertools

# initializing the lists
list_1 = [1, 2, 3, 4, 5]
list_2 = [5, 8, 7, 1, 3, 6]

# pairs
pairs = itertools.product(list_1, list_2)

# filtering the pairs
result = [pair for pair in pairs if pair[0] != pair[1]]

# printing the result
print(result)

If you run the above code, then you will get the following result.

Output

[(1, 5), (1, 8), (1, 7), (1, 3), (1, 6), (2, 5), (2, 8), (2, 7), (2, 1), (2, 3), (2, 6), (3, 5), (3, 8), (3, 7), (3, 1), (3, 6), (4, 5), (4, 8), (4, 7), (4, 1), (4, 3), (4, 6), (5, 8), (5, 7), (5, 1), (5, 3), (5, 6)]

Conclusion

If you run the above code, then you will get the following result.

Hafeezul Kareem

Updated on: 13-Nov-2020

4K+ Views

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