The problem of swapping a single number can be extended to the issue of having the list and perform the swap over an entire range which can be a useful utility over a time. This has its application in any kind of data manipulation in various domains. Let’s discuss certain ways in which this can be performed.
Method #1 : Using list slicing and swapping
The lists can be swapped the same ways a variable can be swapped in python but the difference is that instead of variable, we pass a sliced list to be swapped.
# Python3 code to demonstrate # swapping sublist # using list swapping and slicing # initializing list test_list = [ 1 , 4 , 5 , 8 , 3 , 10 , 6 , 7 , 11 , 14 , 15 , 2 ] # printing the original list print ( "The original list is : " + str (test_list)) # using list swapping and slicing # swapping sublist test_list[ 1 : 3 ], test_list[ 6 : 8 ] = test_list[ 6 : 8 ], test_list[ 1 : 3 ] # printing result print ( "The list after sublist swapping : " + str (test_list)) |
The original list is : [1, 4, 5, 8, 3, 10, 6, 7, 11, 14, 15, 2] The list after sublist swapping : [1, 6, 7, 8, 3, 10, 4, 5, 11, 14, 15, 2]
Method #2 : Using slice() + itertools.chain.from_iterable()
The slice function can perform the slice functionality to extract a sublist from a list and from_iterable function helps to perform the swap functionality.
# Python3 code to demonstrate swapping # sublist using slice() + itertools.chain.from_iterable() import itertools # initializing list test_list = [ 1 , 4 , 5 , 8 , 3 , 10 , 6 , 7 , 11 , 14 , 15 , 2 ] # printing the original list print ( "The original list is : " + str (test_list)) # using slice() + itertools.chain.from_iterable() # swapping sublist slice_1 = test_list[ 1 : 3 ] slice_2 = test_list[ 6 : 8 ] slice_temp = [ slice ( 0 , 1 ), slice ( 6 , 8 ), slice ( 3 , 6 ), slice ( 1 , 3 ), slice ( 8 , len (test_list))] res = list (itertools.chain.from_iterable([test_list[i] for i in slice_temp])) # printing result print ( "The list after sublist swapping : " + str (res)) |
The original list is : [1, 4, 5, 8, 3, 10, 6, 7, 11, 14, 15, 2] The list after sublist swapping : [1, 6, 7, 8, 3, 10, 4, 5, 11, 14, 15, 2]
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