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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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