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Python - Split list into all possible tuple pairs
When it is required to split the list into all the possible tuple pairs, a method can be defined that takes a list as a parameter and uses list comprehension to iterate through the list and use ‘extend’ method
Example
Below is a demonstration of the same
def determine_pairings(my_list):
if len(my_list) <= 1:
return [my_list]
result = [[my_list[0]] + element for element in determine_pairings(my_list[1:])]
for index in range(1, len(my_list)):
result.extend([[(my_list[0], my_list[index])] + element for element in determine_pairings(my_list[1: index] + my_list[index + 1:])])
return result
my_list = [56, 31, 78, 0]
print("The list is :")
print(my_list)
my_result = determine_pairings(my_list)
print("The resultant pairs are :")
print(my_result)Output
The list is : [56, 31, 78, 0] The resultant pairs are : [[56, 31, 78, 0], [56, 31, (78, 0)], [56, (31, 78), 0], [56, (31, 0), 78], [(56, 31), 78, 0], [(56, 31), (78, 0)], [(56, 78), 31, 0], [(56, 78), (31, 0)], [(56, 0), 31, 78], [(56, 0), (31, 78)]]
Explanation
A method named ‘determine_pairings’ is defined that takes a list as a parameter.
The length of the list is checked to be greater than 1.
The elements excluding the firs element is considered and the method is called again.
This is assigned to a variable.
The list is iterated over again, and the first element and the index element is added to the variable.
This is returned as output.
Updated on: 20-Sep-2021
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