diff --git a/cs171/Lect09/hello.py b/cs171/Lect09/hello.py
new file mode 100644
index 0000000000000000000000000000000000000000..e2c4f5f3339b62f66857704839b77d1db8bdec1b
--- /dev/null
+++ b/cs171/Lect09/hello.py
@@ -0,0 +1,8 @@
+
+
+def swap(list, i, j):
+    temp = list[i]
+    list[i] = list[j]
+    list[j] = temp
+    
+    
\ No newline at end of file
diff --git a/cs171/hello.py b/cs171/hello.py
deleted file mode 100644
index 061448a8d1383c3b10b99d3b4667be38bd953c3a..0000000000000000000000000000000000000000
--- a/cs171/hello.py
+++ /dev/null
@@ -1 +0,0 @@
-print("Hello CS 171")
diff --git a/cs172/Lect09/BSTree.py b/cs172/Lect09/BSTree.py
new file mode 100644
index 0000000000000000000000000000000000000000..d1af1ec773c80d2f1f85de34fe1d72c4eabe8e5a
--- /dev/null
+++ b/cs172/Lect09/BSTree.py
@@ -0,0 +1,64 @@
+from Node import Node
+
+class BSTree:
+    
+    def __init__(self):
+        self.__root = None
+        
+    def __str__(self):
+        return str(self.__root)
+    
+    def contains(self, value, parent="ROOT"):
+        if str(parent) == "ROOT":
+            parent = self.__root
+            
+        if parent is None:
+            return False
+
+        if parent.getData() == value:
+            return True
+        elif value < parent.getData():
+            return self.contains(value, parent.getLeft())
+        else:
+            return self.contains(value, parent.getRight())
+            
+    
+    def insert(self, value, parent="ROOT"):
+        
+        if self.__root is None:
+            self.__root = Node(value)
+        else:
+            if str(parent) == "ROOT":
+                parent = self.__root
+                
+            if value <= parent.getData():
+                if(parent.getLeft() is None):
+                    # Place it to the left
+                    parent.setLeft(Node(value))
+                else:
+                    self.insert(value, parent.getLeft())
+            else:
+                if(parent.getRight() is None):
+                    # Place it to the right
+                    parent.setRight(Node(value))
+                else:
+                    self.insert(value, parent.getRight())                
+
+if __name__ == "__main__":
+    
+    myTree = BSTree()
+    myTree.insert(8)
+    myTree.insert(6)
+    myTree.insert(7)
+    print(myTree.contains(5))
+
+#     root = Node(25)
+#     left = Node(10)
+#     right = Node(50)
+# 
+#     root.setLeft(left)
+#     root.setRight(right)
+# 
+#     print(root)
+#     print(root.getLeft())
+#     print(root.getRight())
diff --git a/cs172/Lect09/Node..py b/cs172/Lect09/Node..py
new file mode 100644
index 0000000000000000000000000000000000000000..c1615c851bc95a1b311f2adf8c81cd473044de90
--- /dev/null
+++ b/cs172/Lect09/Node..py
@@ -0,0 +1,21 @@
+class Node:
+    
+    def __init__(self, data, left=None, right=None):
+        self.__data = data
+        self.__left = left
+        self.__right = right
+        
+    def setLeft(self, newLeft):
+        self.__left = newLeft
+        
+    def setRight(self, newRight):
+        self.__right = newRight
+        
+    def getLeft(self):
+        return self.__left
+    
+    def getRight(self):
+        return self.__right
+    
+    def getData(self):
+        return self.__data
\ No newline at end of file
diff --git a/cs172/Lect09/Node.py b/cs172/Lect09/Node.py
new file mode 100644
index 0000000000000000000000000000000000000000..f54d749d63b5f4493bbf70ce9135b2b7a9892672
--- /dev/null
+++ b/cs172/Lect09/Node.py
@@ -0,0 +1,39 @@
+class Node:
+    
+    def __init__(self, data, left=None, right=None):
+        self.__data = data
+        self.__left = left
+        self.__right = right
+        
+    def setLeft(self, newLeft):
+        self.__left = newLeft
+        
+    def setRight(self, newRight):
+        self.__right = newRight
+        
+    def getLeft(self):
+        return self.__left
+    
+    def getRight(self):
+        return self.__right
+    
+    def getData(self):
+        return self.__data
+    
+    def __str__(self):
+        return str(self.__data)
+    
+    def __lt__(self, other):
+        return self.__data < other.getData()
+    
+    def __gt__(self, other):
+        return self.__data > other.getData()
+    
+    def __eq__(self, other):
+        return self.__data == other.getData()
+    
+    def __le__(self, other):
+        return self.__data <= other.getData()
+    
+    def __ge__(self, other):
+        return self.__data >= other.getData()
\ No newline at end of file
diff --git a/cs172/hello.py b/cs172/Lect09/hello.py
similarity index 100%
rename from cs172/hello.py
rename to cs172/Lect09/hello.py