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Python – Trim tuples by K
• Last Updated : 12 Nov, 2020

Given the Tuple list, trim each tuple by K.

Examples:

Input : test_list = [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1), (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)], K = 2
Output : [(2,), (9,), (2,), (2,)]
Explanation : 2 elements each from front and rear are removed.

Input : test_list = [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1), (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)], K = 1
Output : [(3, 2, 1), (4, 9, 2), (1, 2, 3), (8, 2, 1)]
Explanation : 1 element each from front and rear are removed.

Method #1: Using loop + slicing

In this, we omit front and rear K elements by using slicing, converting tuple to list, then reconversion to the tuple.

## Python3

 # Python3 code to demonstrate working of# Trim tuples by K# Using loop + slicing  # initializing listtest_list = [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1),             (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)]  # printing original listprint("The original list is : " + str(test_list))  # initializing KK = 2  res = []for ele in test_list:    N = len(ele)      # triming elements    res.append(tuple(list(ele)[K: N - K]))  # printing resultprint("Converted Tuples : " + str(res))

Output:

The original list is : [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1), (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)]
Converted Tuples : [(2,), (9,), (2,), (2,)]

Method #2: Using list comprehension + slicing

In this, we perform tasks in a similar way as the above method, difference being list comprehension is employed to perform the task in one-liner.

## Python3

 # Python3 code to demonstrate working of# Trim tuples by K# Using list comprehension + slicing  # initializing listtest_list = [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1),             (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)]  # printing original listprint("The original list is : " + str(test_list))  # initializing KK = 2  # one-liner approach to solve problemres = [tuple(list(ele)[K: len(ele) - K]) for ele in test_list]  # printing resultprint("Converted Tuples : " + str(res))

Output:

The original list is : [(5, 3, 2, 1, 4), (3, 4, 9, 2, 1), (9, 1, 2, 3, 5), (4, 8, 2, 1, 7)]
Converted Tuples : [(2,), (9,), (2,), (2,)]

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