Skip to content
Related Articles

Related Articles

Python – Differential Sort String Numbers and Alphabets
  • Last Updated : 05 Sep, 2020
GeeksforGeeks - Summer Carnival Banner

Given a List String, Reorder List, with Sorted Alphabets followed by Sorted Strings.

Input : test_list = [“1”, “G”, “10”, “L”, “9”, “K”, “4”]
Output : [‘G’, ‘K’, ‘L’, ‘1’, ‘4’, ‘9’, ’10’]
Explanation : Alphabets sorted, succeeded by sorted digits.

Input : test_list = [“1”, “G”, “10”, “L”, “9”]
Output : [‘G’, ‘L’, ‘1’, ‘9’, ’10’]
Explanation : Alphabets sorted, succeeded by sorted digits.

Method #1 : Using isnumeric() + loop

In this, we separate numerics and alphabetic characters, using isnumeric(), and then perform sort on each list, then perform join of both lists for obtaining result. Works with only 1 digit numbers string.



Python3




# Python3 code to demonstrate working of 
# Differential Sort String Numbers and Alphabets
# Using isnumeric() + loop
  
# initializing list
test_list = ["1", "G", "7", "L", "9", "M", "4"
  
# printing original list
print("The original list is : " + str(test_list))
  
numerics = []
alphabets = []
for sub in test_list:
      
    # checking and inserting in respective container
    if sub.isnumeric():
        numerics.append(sub)
    else:
        alphabets.append(sub)
  
# attaching lists post sort
res = sorted(alphabets) + sorted(numerics)
  
# printing result 
print("The Custom sorted result : " + str(res))
Output
The original list is : ['1', 'G', '7', 'L', '9', 'M', '4']
The Custom sorted result : ['G', 'L', 'M', '1', '4', '7', '9']

Method #2 : Using sorted() + isnumeric()

This is one liner way to solve this problem, it checks for numerics using isnumeric and sorted() is used to perform sort(). Converts elements to intergers and tests, can handle more than 1 digit numbers.

Python3




# Python3 code to demonstrate working of 
# Differential Sort String Numbers and Alphabets
# Using sorted() + isnumeric()
  
# initializing list
test_list = ["100", "G", "74", "L", "98", "M", "4"]
  
# printing original list
print("The original list is : " + str(test_list))
  
# using int() to type convert to integer
# using sorted() to perform sort operation
res = sorted(test_list, key = lambda ele: (ele.isnumeric(), int(ele) if ele.isnumeric() else ele))
  
# printing result 
print("The Custom sorted result : " + str(res))
Output
The original list is : ['100', 'G', '74', 'L', '98', 'M', '4']
The Custom sorted result : ['G', 'L', 'M', '4', '74', '98', '100']

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 arrow_drop_up
Recommended Articles
Page :