Extract Elements Between Multiple Specific Ranges of Index in Python

When it is required to extract elements that are in between multiple specific range of index, the ‘extend’ method, a simple iteration and indexing are used.

Example

Below is a demonstration of the same −

my_list = [13, 21, 81, 10, 13, 17, 22, 18, 11, 90, 0]

print("The list is : ")
print(my_list)
print("The list after sorting is : " )
my_list.sort()
print(my_list)

range_list = [(2, 4), (7, 8), (1, 2), (2,7)]

my_result = []
for element in range_list:
   my_result.extend(my_list[element[0] : element[1] + 1])

print("The resultant list is : ")
print(my_result)

print("The result after sorting is : " )
my_result.sort()
print(my_result)

Output

The list is :
[13, 21, 81, 10, 13, 17, 22, 18, 11, 90, 0]
The list after sorting is :
[0, 10, 11, 13, 13, 17, 18, 21, 22, 81, 90]
The resultant list is :
[11, 13, 13, 21, 22, 10, 11, 11, 13, 13, 17, 18, 21]
The result after sorting is :
[10, 11, 11, 11, 13, 13, 13, 13, 17, 18, 21, 21, 22]

Explanation

• A list is defined and is displayed on the console.

• It is sorted and displayed on the console.

• Another list of tuples is defined. It indicates the ranges.

• An empty list is defined.

• The list is iterated over, and using list indexing the current and next element incremented by 1 are appended to the empty list.

• This is displayed as output on the console.

• It is sorted and displayed again on the console.