Python | Slicing list from Kth element to last element
Python list slicing slices the list from start index till end – 1, specified as list elements. So its tricky when we require to also slice the last element of list. Trying to slice till list size + 1 gives an error. Let’s discuss ways in which last element can be included during a list slice.
Method #1 : Using None
During list slicing, giving the desired first index K and specifying ‘None’ as the second argument in slicing works internally as slicing all the elements from K in list till end including it.
# Python3 code to demonstrate # list slicing from K to end# using None # initializing listtest_list = [5, 6, 2, 3, 9] # printing original listprint ("The original list is : " + str(test_list)) # index to begin slicingK = 2 # using None # to perform list slicing from K to endres = test_list[K : None] # printing result print ("The sliced list is : " + str(res)) |
The original list is : [5, 6, 2, 3, 9] The sliced list is : [2, 3, 9]
Method #2 : Leaving the last element empty
Usually, not specifying any element as end element of slicing instructs python to include whole list after K in list. But the main drawback in using this is code readability. Hence above method is preferred more than this.
# Python3 code to demonstrate # list slicing from K to end# without specifying last element # initializing listtest_list = [5, 6, 2, 3, 9] # printing original listprint ("The original list is : " + str(test_list)) # index to begin slicingK = 2 # without specifying last element # to perform list slicing from K to endres = test_list[K :] # printing result print ("The sliced list is : " + str(res)) |
The original list is : [5, 6, 2, 3, 9] The sliced list is : [2, 3, 9]
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