# Python – All possible concatenations in String List

Sometimes, while working with String lists, we can have a problem in which we need to perform all possible concatenations of all the strings that occur in list. This kind of problem can occur in domains such as day-day programming and school programming. Let’s discuss a way in which this task can be performed.

Input : test_list = [‘Gfg’, ‘Best’]
Output : [‘Gfg’, ‘Best’, ‘GfgBest’, ‘BestGfg’]

Input : test_list = [‘Gfg’]
Output : [‘Gfg’]

Method : Using `permutations() + join()` + loop
The combination of above functions can be used to solve this problem. In this, we perform the task of concatenation using join() and all possible combination extraction using permutations().

 `# Python3 code to demonstrate working of  ` `# All possible concatenations in String List ` `# Using permutations() + loop ` `from` `itertools ``import` `permutations ` ` `  `# initializing list ` `test_list ``=` `[``'Gfg'``, ``'is'``, ``'Best'``] ` ` `  `# printing original list  ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# All possible concatenations in String List ` `# Using permutations() + loop ` `temp ``=` `[] ` `for` `idx ``in` `range``(``1``, ``len``(test_list) ``+` `1``): ` `    ``temp.extend(``list``(permutations(test_list, idx))) ` `res ``=` `[] ` `for` `ele ``in` `temp: ` `    ``res.append("".join(ele)) ` ` `  `# printing result  ` `print``(``"All Sring combinations : "` `+` `str``(res)) `

Output :

The original list : [‘Gfg’, ‘is’, ‘Best’]
All Sring combinations : [‘Gfg’, ‘is’, ‘Best’, ‘Gfgis’, ‘GfgBest’, ‘isGfg’, ‘isBest’, ‘BestGfg’, ‘Bestis’, ‘GfgisBest’, ‘GfgBestis’, ‘isGfgBest’, ‘isBestGfg’, ‘BestGfgis’, ‘BestisGfg’]

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