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Python – Sort by Uppercase Frequency
  • Last Updated : 24 Oct, 2020

Given a list of strings, perform sorting by frequency of uppercase characters. 

Input : test_list = [“Gfg”, “is”, “FoR”, “GEEKS”] 
Output : [‘is’, ‘Gfg’, ‘FoR’, ‘GEEKS’] 
Explanation : 0, 1, 2, 5 uppercase letters in strings respectively.
 

Input : test_list = [“is”, “GEEKS”] 
Output : [‘is’, ‘GEEKS’] 
Explanation : 0, 5 uppercase letters in strings respectively. 

Method #1 : Using sort() + isupper()

In this, we perform task of checking for uppercase using isupper(), and sort() to perform task of sorting.



Python3




# Python3 code to demonstrate working of
# Sort by Uppercase Frequency
# Using isupper() + sort()
  
  
# helper function
def upper_sort(sub):
  
    # len() to get total uppercase characters
    return len([ele for ele in sub if ele.isupper()])
  
  
# initializing list
test_list = ["Gfg", "is", "BEST", "FoR", "GEEKS"]
  
# printing original list
print("The original list is: " + str(test_list))
  
# using external function to perform sorting
test_list.sort(key=upper_sort)
  
# printing result
print("Elements after uppercase sorting: " + str(test_list))

Output:

The original list is: ['Gfg', 'is', 'BEST', 'FoR', 'GEEKS']
Elements after uppercase sorting: ['is', 'Gfg', 'FoR', 'BEST', 'GEEKS']

Method #2 : Using sorted() + lambda function

In this, we perform the task of sorting using sorted(), and lambda function is used rather than external sort() function to perform task of sorting.

Python3




# Python3 code to demonstrate working of
# Sort by Uppercase Frequency
# Using sorted() + lambda function
  
  
# initializing list
test_list = ["Gfg", "is", "BEST", "FoR", "GEEKS"]
  
# printing original list
print("The original list is: " + str(test_list))
  
# sorted() + lambda function used to solve problem
res = sorted(test_list, key=lambda sub: len(
    [ele for ele in sub if ele.isupper()]))
  
# printing result
print("Elements after uppercase sorting: " + str(res))

Output:

The original list is: ['Gfg', 'is', 'BEST', 'FoR', 'GEEKS']
Elements after uppercase sorting: ['is', 'Gfg', 'FoR', 'BEST', 'GEEKS']

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