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Python – Sort Strings by Case difference
• Last Updated : 02 Dec, 2020

Given Strings List, the task is to write a Python program to perform sort on basis of difference of cases i.e count of lower case and upper case.

Examples:

Input : test_list = [“GFG”, “GeeKs”, “best”, “FOr”, “alL”, “GEEKS”]
Output : [‘GeeKs’, ‘FOr’, ‘alL’, ‘GFG’, ‘best’, ‘GEEKS’]
Explanation : ees(3) – GK(2) = 1, hence at 1st index, others are ordered accordingly.

Input : test_list = [“GFG”, “GeeKs”, “best”]
Output : [‘GeeKs’, ‘GFG’, ‘best’]
Explanation : ees(3) – GK(2) = 1, hence at 1st index, others are ordered accordingly.

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

In this inplace sorting is performed using sort(), and islower() and isupper() is used to check for cases and count. Then abs() is used to get the absolute difference for providing parameters to perform sort over.

## Python3

 `# Python3 code to demonstrate working of``# Sort Strings by Case difference``# Using sort() + islower() + isupper() + abs()`` ` ` ` `def` `get_case_diff(string):`` ` `    ``# getting case count and difference``    ``lower_cnt ``=` `len``([ele ``for` `ele ``in` `string ``if` `ele.islower()])``    ``upper_cnt ``=` `len``([ele ``for` `ele ``in` `string ``if` `ele.isupper()])``    ``return` `abs``(lower_cnt ``-` `upper_cnt)`` ` ` ` `# initializing Matrix``test_list ``=` `[``"GFG"``, ``"GeeKs"``, ``"best"``, ``"FOr"``, ``"alL"``, ``"GEEKS"``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# inplace sort using sort()``test_list.sort(key``=``get_case_diff)`` ` `# printing result``print``(``"Sorted Strings by case difference : "` `+` `str``(test_list))`

Output:

The original list is : [‘GFG’, ‘GeeKs’, ‘best’, ‘FOr’, ‘alL’, ‘GEEKS’]
Sorted Strings by case difference : [‘GeeKs’, ‘FOr’, ‘alL’, ‘GFG’, ‘best’, ‘GEEKS’]

Method #2 : Using sorted() + lambda + islower() + len() + isupper() + abs()

Similar to above method, difference being way of sorting used, sorted() and lambda used as a way of injecting functionality.

## Python3

 `# Python3 code to demonstrate working of``# Python3 code to demonstrate working of``# Sort Strings by Case difference``# Using sorted() + lambda + islower() + len() + isupper() + abs()`` ` `# initializing Matrix``test_list ``=` `[``"GFG"``, ``"GeeKs"``, ``"best"``, ``"FOr"``, ``"alL"``, ``"GEEKS"``]``             ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# sorting using sorted()``# lambda function to inject functionality``res ``=` `sorted``(test_list, key ``=` `lambda` `string : \``        ``abs``(``len``([ele ``for` `ele ``in` `string ``if` `ele.islower()]) ``-` `\``        ``len``([ele ``for` `ele ``in` `string ``if` `ele.isupper()])))`` ` `# printing result``print``(``"Sorted Strings by case difference : "` `+` `str``(res))`

Output:

The original list is : [‘GFG’, ‘GeeKs’, ‘best’, ‘FOr’, ‘alL’, ‘GEEKS’]
Sorted Strings by case difference : [‘GeeKs’, ‘FOr’, ‘alL’, ‘GFG’, ‘best’, ‘GEEKS’]

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