Sort mixed list in Python

Last Updated : 11 May, 2020

Sometimes, while working with Python, we can have a problem in which we need to sort a particular list which has mixed data types. That it contains integers and strings and we need to sort each of them accordingly. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using sort() + comparator

This problem can be solved using sort functionality provided by Python. We can construct our own custom comparator to complete the task of mixed sort.

# Python3 code to demonstrate working of 
# Sort Mixed List 
# using sort() + comparator 
  
# comparator function for sort 
def mixs(num): 
    try: 
        ele = int(num) 
        return (0, ele, '') 
    except ValueError: 
        return (1, num, '') 
  
  
# initialize list  
test_list = [4, 'gfg', 2, 'best', 'is', 3] 
  
# printing original list  
print("The original list : " + str(test_list)) 
  
# Sort Mixed List 
# using sort() + comparator 
test_list.sort(key = mixs) 
  
# printing result 
print("List after mixed sorting : " + str(test_list)) 

Output :

The original list : [4, 'gfg', 2, 'best', 'is', 3]
List after mixed sorting : [2, 3, 4, 'best', 'gfg', 'is']

Method #2 : Using sorted() + key + lambda + isdigit()

The combination of above functionalities can also be used to achieve solution to this problem. In this, we just sort the list using sorted() using key functionality using lambda function to segregate digits using isdigit().

# Python3 code to demonstrate working of 
# Sort Mixed List 
# using sorted() + key + lambda + isdigit() 
  
# initialize list  
test_list = ['4', 'gfg', '2', 'best', 'is', '3'] 
  
# printing original list  
print("The original list : " + str(test_list)) 
  
# Sort Mixed List 
# using sorted() + key + lambda + isdigit() 
res = sorted(test_list, key = lambda ele: (0, int(ele)) 
                        if ele.isdigit() else (1, ele)) 
  
# printing result 
print("List after mixed sorting : " + str(res)) 

Output :

The original list : ['4', 'gfg', '2', 'best', 'is', '3']
List after mixed sorting : ['2', '3', '4', 'best', 'gfg', 'is']

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes

Related Articles