diff --git a/data_structures/AVL/AVL.py b/data_structures/AVL/AVL.py
new file mode 100644
index 00000000..0e3008dc
--- /dev/null
+++ b/data_structures/AVL/AVL.py
@@ -0,0 +1,131 @@
+'''
+A AVL tree
+'''
+
+
+class Node:
+
+    def __init__(self, label):
+        self.label = label
+        self.left = None
+        self.rigt = None
+        self.parent = None
+        self.height = 0
+
+    def getLabel(self):
+        return self.label
+
+    def setLabel(self, label):
+        self.label = label
+
+    def getLeft(self):
+        return self.left
+
+    def setLeft(self, left):
+        self.left = left
+
+    def getRight(self):
+        return self.rigt
+
+    def setRight(self, right):
+        self.rigt = right
+
+    def getParent(self):
+        return self.parent
+
+    def setParent(self, parent):
+        self.parent = parent
+
+    def setHeight(self, height):
+        self.height = height
+
+    def getHeight(self, height):
+        return self.height
+
+
+class AVL:
+
+    def __init__(self):
+        self.root = None
+        self.size = 0
+
+    def insert(self, value):
+        node = Node(value)
+        if self.root is None:
+            self.root = node
+            self.size = 1
+        else:
+            # Same as Binary Tree
+            dad_node = None
+            curr_node = self.root
+
+            while True:
+                if curr_node is not None:
+
+                    dad_node = curr_node
+
+                    if node.getLabel() < curr_node.getLabel():
+                        curr_node = curr_node.getLeft()
+                    else:
+                        curr_node = curr_node.getRight()
+                else:
+                    if node.getLabel() < dad_node.getLabel():
+                        dad_node.setLeft(node)
+                        dad_node.setHeight(dad_node.getHeight() + 1)
+
+                        if (dad_node.getRight().getHeight() -
+                                dad_node.getLeft.getHeight() > 1):
+                            self.rebalance(dad_node)
+
+                    else:
+                        dad_node.setRight(node)
+                        dad_node.setHeight(dad_node.getHeight() + 1)
+
+                        if (dad_node.getRight().getHeight() -
+                                dad_node.getLeft.getHeight() > 1):
+                            self.rebalance(dad_node)
+                    break
+
+    def rebalance(self, node):
+        if (node.getRight().getHeight() -
+                node.getLeft.getHeight() > 1):
+            if (node.getRight().getHeight() >
+                    node.getLeft.getHeight()):
+                pass
+            else:
+                pass
+            pass
+        elif (node.getRight().getHeight() -
+                node.getLeft.getHeight() > 2):
+            if (node.getRight().getHeight() >
+                    node.getLeft.getHeight()):
+                pass
+            else:
+                pass
+            pass
+        pass
+
+    def rotate_left(self, node):
+        # TODO: is this pythonic enought?
+        aux = node.getLabel()
+        node = aux.getRight()
+        node.setHeight(node.getHeight() - 1)
+        node.setLeft(Node(aux))
+        node.getLeft().setHeight(node.getHeight() + 1)
+        node.getRight().setHeight(node.getRight().getHeight() - 1)
+
+    def rotate_right(self, node):
+        aux = node.getLabel()
+        node = aux.getLeft()
+        node.setHeight(node.getHeight() - 1)
+        node.setRight(Node(aux))
+        node.getLeft().setHeight(node.getHeight() + 1)
+        node.getLeft().setHeight(node.getLeft().getHeight() - 1)
+
+    def double_rotate_left(self, node):
+        self.rotate_right(node.getRight().getRight())
+        self.rotate_left(node)
+
+    def double_rotate_right(self, node):
+        self.rotate_left(node.getLeft().getLeft())
+        self.rotate_right(node)
diff --git a/data_structures/Binary Tree/binary_seach_tree.py b/data_structures/Binary Tree/binary_seach_tree.py
index 1f14514b..1dac948a 100644
--- a/data_structures/Binary Tree/binary_seach_tree.py	
+++ b/data_structures/Binary Tree/binary_seach_tree.py	
@@ -1,6 +1,8 @@
 '''
 A binary search Tree
 '''
+
+
 class Node:
 
     def __init__(self, label):
@@ -34,7 +36,7 @@ class BinarySearchTree:
 
     def insert(self, label):
 
-        #Create a new Node
+        # Create a new Node
 
         node = Node(label)
 
@@ -45,7 +47,7 @@ class BinarySearchTree:
             curr_node = self.root
 
             while True:
-                if curr_node != None:
+                if curr_node is not None:
 
                     dad_node = curr_node
 
@@ -61,12 +63,12 @@ class BinarySearchTree:
                     break
 
     def empty(self):
-        if self.root == None:
+        if self.root is None:
             return True
         return False
 
     def preShow(self, curr_node):
-        if curr_node != None:
+        if curr_node is None:
             print(curr_node.getLabel(), end=" ")
 
             self.preShow(curr_node.getLeft())