Add recursive bubble sort

sorts/recursive_bubble_sort.py

@@ -0,0 +1,40 @@
+def bubble_sort(list1):
+    """
+    It is similar is bubble sort but recursive.
+    :param list1: mutable ordered sequence of elements
+    :return: the same list in ascending order
+
+    >>> bubble_sort([0, 5, 2, 3, 2])
+    [0, 2, 2, 3, 5]
+
+    >>> bubble_sort([])
+    []
+
+    >>> bubble_sort([-2, -45, -5])
+    [-45, -5, -2]
+
+    >>> bubble_sort([-23, 0, 6, -4, 34])
+    [-23, -4, 0, 6, 34]
+
+    >>> bubble_sort([-23, 0, 6, -4, 34]) == sorted([-23, 0, 6, -4, 34])
+    True
+
+    >>> bubble_sort(['z','a','y','b','x','c'])
+    ['a', 'b', 'c', 'x', 'y', 'z']
+
+    """
+
+    for i, num in enumerate(list1): 
+        try: 
+            if list1[i+1] < num: 
+                list1[i] = list1[i+1] 
+                list1[i+1] = num 
+                bubble_sort(list1) 
+        except IndexError: 
+            pass
+    return list1 
+
+if __name__ == "__main__":     
+    list1 = [33,99,22,11,66]    
+    bubble_sort(list1)     
+    print(list1)