Python – Consecutive Tuple difference

Given List of tuples, find index-wise absolute difference of consecutive tuples.

Input : test_list = [(5, 3), (1, 4), (9, 5), (3, 5)]
Output : [(4, 1), (7, 1), (6, 0)]
Explanation : 5 – 1 = 4, 4 – 3 = 1. hence (4, 1) and so on.

Input : test_list = [(9, 5), (3, 5)]
Output : [(6, 0)]
Explanation : 9 – 3 = 6, 5 – 5 = 0.

Method #1 : Using list comprehension

This is one way in which this task can be performed. In this, we employ brute force strategy on list using list comprehension strategy to perform this task as a one-liner.



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# Python3 code to demonstrate working of 
# Consecutive Tuple difference
# Using list comprehension
  
# initializing lists
test_list = [(6, 3), (1, 4), (8, 5), (3, 5)]
  
# printing original list
print("The original list : " + str(test_list))
  
# using list comprehension to perform absolute difference
# using abs() for difference
res = [(abs(test_list[idx + 1][0] - test_list[idx][0]), abs(test_list[idx + 1][1] - test_list[idx][1])) 
      for idx in range(len(test_list) - 1)]
  
# printing result 
print("The extracted list : " + str(res))

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Output

The original list : [(6, 3), (1, 4), (8, 5), (3, 5)]
The extracted list : [(5, 1), (7, 1), (5, 0)]

Method #2 : Using tuple() + map() + sub

The combination of above functions can be used to solve this problem. In this, we perform the task of perform subtraction using sub and map() is used to extend the logic to whole list elements. Doesn’t output absolute result.

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# Python3 code to demonstrate working of 
# Consecutive Tuple difference
# Using tuple() + map() + sub
from operator import sub
  
# initializing lists
test_list = [(6, 3), (1, 4), (8, 5), (3, 5)]
  
# printing original list
print("The original list : " + str(test_list))
  
# using loop to iterate elements
# using sub and map() to perform the subtraction to whole elements
res = []
for idx in range(len(test_list) - 1):
    res.append(tuple(map(sub, test_list[idx + 1][0:], test_list[idx][0:])))
      
# printing result 
print("The extracted list : " + str(res))

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Output

The original list : [(6, 3), (1, 4), (8, 5), (3, 5)]
The extracted list : [(-5, 1), (7, 1), (-5, 0)]



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