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Python – Case Insensitive string counter
• Last Updated : 02 Sep, 2020

Given a List of Strings, find frequency of strings case insensitive.

Input : test_list = [“Gfg”, “Best”, “GFG”, “is”, “IS”, “BEST”]
Output : {‘gfg’: 2, ‘best’: 2, ‘is’: 2}
Explanation : All occur twice.

Input : test_list = [“Gfg”, “gfg”, “GFG”]
Output : {‘gfg’: 3}
Explanation : Only “gfg” 3 occurrences.

Method : Using defaultdict() + lower()

In this, we perform lower() to all the strings, before mapping in defaultdict. This ensures case insensitivity while mapping and cumulating frequency.

## Python3

 `# Python3 code to demonstrate working of ``# Strings Frequency (Case Insensitive)``# Using defaultdict() + lower()``from` `collections ``import` `defaultdict`` ` `# initializing list``test_list ``=` `[``"Gfg"``, ``"Best"``, ``"best"``, ``"gfg"``, ``"GFG"``, ``"is"``, ``"IS"``, ``"BEST"``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `res ``=` `defaultdict(``int``)``for` `ele ``in` `test_list:``     ` `    ``# lowercasing to cater for Case Insensitivity``    ``res[ele.lower()] ``+``=` `1`` ` `# printing result ``print``(``"Strings Frequency : "` `+` `str``(``dict``(res)))`
Output
```The original list is : ['Gfg', 'Best', 'best', 'gfg', 'GFG', 'is', 'IS', 'BEST']
Strings Frequency : {'gfg': 3, 'best': 3, 'is': 2}
```

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