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# Python – String with most unique characters

• Last Updated : 06 Mar, 2020

Sometimes, while working with python strings, we can have a problem in which we desire to extract particular list which has most number of unique characters. This kind of problem can have application in competitive programming and web development domain. Lets discuss certain ways in which this task can be performed.

Method #1 : Using max() + dictionary comprehension
The combination of above functionalities can be used to perform this task. In this, we firstly collect the frequency of each character using dictionary and then employ max() to compute the string with most unique characters.

 `# Python3 code to demonstrate ``# String with most unique characters``# using max() + dictionary comprehension`` ` `# Initializing list``test_list ``=` `[``'gfg'``, ``'is'``, ``'best'``, ``'for'``, ``'geeksc'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# String with most unique characters``# using max() + dictionary comprehension``temp ``=`  `{idx : ``len``(``set``(idx)) ``for` `idx ``in` `test_list}``res ``=` `max``(temp, key ``=` `temp.get)`` ` `# printing result ``print` `(``"The string with most unique characters is : "` `+` `str``(res))`
Output :
```The original list is : ['gfg', 'is', 'best', 'for', 'geeksc']
The string with most unique characters is : geeksc
```

Method #2 : Using `max()` + key + lambda
The combination of above methods can be used to perform this task. In this, we perform this task in similar way as above, just the difference is instead of using comprehension we use lambda function to extend logic to each string for computation.

 `# Python3 code to demonstrate ``# String with most unique characters``# using max() + key + lambda`` ` `# Initializing list``test_list ``=` `[``'gfg'``, ``'is'``, ``'best'``, ``'for'``, ``'geeksc'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# String with most unique characters``# using max() + key + lambda``res ``=` `max``(test_list, key ``=` `lambda` `sub: ``len``(``set``(sub)), default ``=` `None``)`` ` `# printing result ``print` `(``"The string with most unique characters is : "` `+` `str``(res))`
Output :
```The original list is : ['gfg', 'is', 'best', 'for', 'geeksc']
The string with most unique characters is : geeksc
```

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