Create permutations.py

Finds all permutations of numbers

permutations.py

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+class Solution:
+    def permute(self, nums: List[int]) -> List[List[int]]:
+        permutations = self.search([], nums)
+        numlen = len(nums)
+        permutations = [permutations[i * numlen:(i + 1) * numlen] for i in range((len(permutations) + numlen - 1) // numlen )] #oneliner splitting list into chunks
+        return permutations
+
+    def search(self, current: List[int], possible: List[int]) -> List[int]:
+        final = []
+        if possible == []:
+            return []
+        elif len(possible) == 1:
+            return current + [possible[0]]
+        for num in possible:
+            final.extend(self.search(current + [num], [p for p in possible if p != num]))
+        return final