1 files changed, 53 insertions, 0 deletions
diff --git a/challenge-095/roger-bell-west/python/ch-2.py b/challenge-095/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..8b3b63b97f
--- /dev/null
+++ b/challenge-095/roger-bell-west/python/ch-2.py
@@ -0,0 +1,53 @@
+#! /usr/bin/python3
+import unittest
+
+class Stack:
+
+    def __init__(self):
+        self.stack=list()
+
+    def push(self,op):
+        self.stack.append(op)
+
+    def pop(self):
+        if len(self.stack)==0:
+            raise Exception("Insufficient elements for pop")
+        return self.stack.pop()
+
+    def top(self):
+        if len(self.stack)==0:
+            raise Exception("Insufficient elements for top")
+        return self.stack[len(self.stack)-1]
+
+    def min(self):
+        if len(self.stack)==0:
+            raise Exception("Insufficient elements for min")
+        return min(self.stack)
+
+class TestStack(unittest.TestCase):
+
+    def test_ex1(self):
+        stack=Stack()
+        stack.push(2)
+        stack.push(-1)
+        stack.push(0)
+        self.assertEqual(stack.pop(),0,'example 1')
+
+    def test_ex2(self):
+        stack=Stack()
+        stack.push(2)
+        stack.push(-1)
+        stack.push(0)
+        stack.pop()
+        self.assertEqual(stack.top(),-1,'example 2')
+
+    def test_ex3(self):
+        stack=Stack()
+        stack.push(2)
+        stack.push(-1)
+        stack.push(0)
+        stack.pop()
+        stack.push(0)
+        self.assertEqual(stack.min(),-1,'example 3')
+
+unittest.main()