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Python program to insert an element into sorted list
  • Last Updated : 18 Dec, 2018

Given a sorted list and an element, Write a Python program to insert the element into the given list in sorted position.

Examples:

Input : list = [1, 2, 4], n = 3
Output : list = [1, 2, 3, 4]

Input : list = ['a', 'b', 'c', 'd'], n = 'e'
Output : list = ['a', 'b', 'c', 'd', 'e']

Approach #1 :
This approach is the brute force method. Since the list is already sorted, we begin with a loop and check if the list element is greater than the given element. If yes, the given element need to be inserted at this position.




# Python3 program to insert 
# an element into sorted list
  
# Function to insert element
def insert(list, n):
      
    # Searching for the position
    for i in range(len(list)):
        if list[i] > n:
            index = i
            break
      
    # Inserting n in the list
    list = list[:i] + [n] + list[i:]
    return list
  
# Driver function
list = [1, 2, 4]
n = 3
  
print(insert(list, n))
Output:
[1, 2, 3, 4]

 
Approach #2 :
Python comes with a bisect module whose purpose is to find a position in list where an element needs to be inserted to keep the list sorted. Thus we use this module to solve the given problem.






# Python3 program to insert 
# an element into sorted list
import bisect 
  
def insert(list, n):
    bisect.insort(list, n) 
    return list
  
# Driver function
list = [1, 2, 4]
n = 3
  
print(insert(list, n))
Output:
[1, 2, 3, 4]

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