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Python | Mutual tuple subtraction in list

  • Last Updated : 25 Nov, 2019

Sometimes, while working with data, we can have a problem in which we need to perform tuple subtraction among all the tuples in list. This can have application in many domains. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using combinations() + list comprehension
This problem can be solved using combinations of above functions. In this, we use combinations() to generate all possible combination among tuples and list comprehension is used to feed subtraction logic.




# Python3 code to demonstrate working of
# Mutual tuple subtraction in list
# Using list comprehension + combinations
from itertools import combinations
  
# initialize list 
test_list = [(2, 4), (6, 7), (5, 1), (6, 10)]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Mutual tuple subtraction in list
# Using list comprehension + combinations
res = [(b1 - a1, b2 - a2) for (a1, a2), (b1, b2) in combinations(test_list, 2)]   
  
# printing result
print("The mutual subtraction tuples are : " + str(res))
Output :
The original list : [(2, 4), (6, 7), (5, 1), (6, 10)]
The mutual subtraction tuples are : [(4, 3), (3, -3), (4, 6), (-1, -6), (0, 3), (1, 9)]

 

Method #2 : Using list comprehension + zip() + operator.sub + combinations()
The combinations of above methods can also solve this problem. In this, we perform the task of subtraction using sub() and the like indexed elements are linked using zip().






# Python3 code to demonstrate working of
# Mutual tuple subtraction in list
# Using list comprehension + zip() + operator.sub + combinations()
from itertools import combinations
import operator
  
# initialize list 
test_list = [(2, 4), (6, 7), (5, 1), (6, 10)]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Mutual tuple subtraction in list
# Using list comprehension + zip() + operator.sub + combinations()
res = [(operator.sub(*a), operator.sub(*b))\
      for a, b in (zip(y, x) for x, y in combinations(test_list, 2))]
  
# printing result
print("The mutual subtraction tuples are : " + str(res))
Output :
The original list : [(2, 4), (6, 7), (5, 1), (6, 10)]
The mutual subtraction tuples are : [(4, 3), (3, -3), (4, 6), (-1, -6), (0, 3), (1, 9)]

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