Upload 2.py

2.py

@@ -0,0 +1,70 @@
+class Empty(Exception): 
+    pass 
+class ArrayStack: 
+    def __init__(self): 
+        self._data = [] 
+    def __len__(self): 
+        return len(self._data) 
+    def is_empty(self): 
+        return len(self._data) == 0 
+    def push(self, e): 
+        self._data.append(e) 
+        print("The element", e, "is pushed successfully") 
+    def top(self): 
+        if self.is_empty(): 
+            raise Empty("Stack is Empty!") 
+        return self._data[-1] 
+    def pop(self): 
+        if self.is_empty(): 
+            raise Empty("Stack is Empty!") 
+        return self._data.pop() 
+print("\t Stack ADT Implementation") 
+print("\t---------------------------------") 
+stack = ArrayStack() 
+while True: 
+    print("\n\t Stack Operations:") 
+ 
+    print("1 - Push") 
+    print("2 - Pop") 
+    print("3 - Top element") 
+    print("4 - Length of stack") 
+    print("5 - Is empty") 
+    print("6 - Display stack elements") 
+    print("7 - Exit") 
+    ch = int(input("Enter your choice: ")) 
+    try: 
+        if ch == 1: 
+            e = int(input("Enter the element: ")) 
+            stack.push(e) 
+        elif ch == 2:  
+            t = stack.pop() 
+            print("The element", t, "is popped successfully") 
+        elif ch == 3: 
+            t = stack.top() 
+            print("The top element in the stack is", t) 
+        elif ch == 4: 
+            print("Number of elements in stack is", len(stack)) 
+        elif ch == 5: 
+            if stack.is_empty(): 
+                print("Stack is Empty") 
+            else: 
+                print("Stack is not empty") 
+        elif ch == 6: 
+            if stack.is_empty(): 
+                print("Stack is empty") 
+ 
+            else: 
+                print("Elements in stack (Top to Bottom):") 
+                for i in range(len(stack) - 1, -1, -1): 
+                    print("|", stack._data[i], "|") 
+                    print("-------------") 
+        elif ch == 7: 
+            print("Program exited") 
+            break 
+        else: 
+            print("Invalid choice") 
+    except Empty as e: 
+        print(e) 
+ 
+    except ValueError: 
+        print("Please enter a valid number")