Python – String uncommon characters

One of the string operation can be computing the uncommon characters of two strings i.e, output the uncommon values that appears in both the strings. This article deals with computing the same through different ways.

Method 1 : Using `set() + symmetric_difference()`
Set in python usually can perform the task of performing set operations such as set symmetric difference. This utility of sets can be used to perform this task as well. Firstly, both the strings are converted into sets using set() and then symmetric difference is performed using symmetric_difference(). Returns the sorted set.

 `# Python 3 code to demonstrate  ` `# String uncommon characters ` `# using set() + symmetric_difference() ` ` `  `# initializing strings ` `test_str1 ``=` `'GeeksforGeeks'` `test_str2 ``=` `'Codefreaks'` ` `  `# Printing initial strings ` `print` `(``"The original string 1 is : "` `+` `test_str1) ` `print` `(``"The original string 2 is : "` `+` `test_str2) ` ` `  `# String uncommon characters ` `# using set() + symmetric_difference() ` `res ``=` `set``(test_str1).symmetric_difference(test_str2) ` `         `  `# printing symmetric_difference ` `print` `(``"The string uncommon elements are : "` `+` `str``(res)) `

Output :

```The original string 1 is : GeeksforGeeks
The original string 2 is : Codefreaks
The string uncommon elements are : {'C', 'd', 'a', 'G'}
```

Method 2 : Using `join()`
join() performs the task similar to list comprehension in case of lists. This encapsulates whole symmetric_difference logic and joins together each element filtered through the symmetric_difference logic into one string, hence computing the symmetric_difference. It converts the strings into set and then computed ^ operation on them.

 `# Python 3 code to demonstrate  ` `# String uncommon characters ` `# using join() ` ` `  `# initializing strings ` `test_str1 ``=` `'GeeksforGeeks'` `test_str2 ``=` `'Codefreaks'` ` `  `# Printing initial strings ` `print` `(``"The original string 1 is : "` `+` `test_str1) ` `print` `(``"The original string 2 is : "` `+` `test_str2) ` ` `  `# using join() to ` `# String uncommon characters ` `res ``=` `''.join(``sorted``(``set``(test_str1) ^ ``set``(test_str2))) ` `         `  `# printing symmetric_difference ` `print` `(``"The string uncommon elements are : "` `+` `str``(res)) `

Output :

```The original string 1 is : GeeksforGeeks
The original string 2 is : Codefreaks
The string uncommon elements are : CGad
```

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