Python | Delete elements in range

Last Updated : 26 Feb, 2019

The deletion of a single element comparatively easier, but when we wish to delete element in range, the task becomes a tedious once due to the rearrangements and shifting of list elements automatically in python. Let’s discuss certain ways in which elements can be deleted in range.

Method #1 : Using del + sorted()
In this method, we reverse the list of indices we wish to delete and delete them in the original list in backward manner so that the rearrangement of list doesn’t destroy the integrity of the solution.

# Python3 code to demonstrate
# range deletion of elements 
# using del + sorted()
  
# initializing list 
test_list = [3, 5, 6, 7, 2, 10]
  
# initializing indices
indices_list = [1, 4, 2]
  
# printing the original list
print ("The original list is : " + str(test_list))
  
# printing the indices list
print ("The indices list is : " + str(indices_list))
  
# using del + sorted()
# range deletion of elements
for i in sorted(indices_list, reverse = True):
    del test_list[i]
  
# printing result
print ("The modified deleted list is : " + str(test_list))

Output:

The original list is : [3, 5, 6, 7, 2, 10]
The indices list is : [1, 4, 2]
The modified deleted list is : [3, 7, 10]

Method #2 : Using enumerate() + list comprehension
This task can also be performed if we make a list that would not have the elements in the delete list, i.e rather than actually deleting the elements, we can remake it without them.

# Python3 code to demonstrate
# range deletion of elements 
# using enumerate() + list comprehension
  
# initializing list 
test_list = [3, 5, 6, 7, 2, 10]
  
# initializing indices
indices_list = [1, 4, 2]
  
# printing the original list
print ("The original list is : " + str(test_list))
  
# printing the indices list
print ("The indices list is : " + str(indices_list))
  
# using enumerate() + list comprehension
# range deletion of elements
test_list[:] = [ j for i, j in enumerate(test_list)
                         if i not in indices_list ]
  
# printing result
print ("The modified deleted list is : " + str(test_list))

Output:

The original list is : [3, 5, 6, 7, 2, 10]
The indices list is : [1, 4, 2]
The modified deleted list is : [3, 7, 10]

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