Create stack.py

stack.py

@@ -0,0 +1,38 @@
+class Stack:
+    def __init__(self):
+        self.items = []
+
+    def is_empty(self):
+        """Check if the stack is empty."""
+        return len(self.items) == 0
+
+    def push(self, item):
+        """Add an item to the top of the stack."""
+        self.items.append(item)
+
+    def pop(self):
+        """Remove and return the top item from the stack."""
+        if not self.is_empty():
+            return self.items.pop()
+        else:
+            raise IndexError("pop from empty stack")
+
+    def peek(self):
+        """Return the top item from the stack without removing it."""
+        if not self.is_empty():
+            return self.items[-1]
+        else:
+            raise IndexError("peek from empty stack")
+
+    def size(self):
+        """Return the number of items in the stack."""
+        return len(self.items)
+
+# Example usage:
+stack = Stack()
+stack.push(5)
+stack.push(10)
+print(f"Top item: {stack.peek()}")
+print(f"Stack size: {stack.size()}")
+print(f"Popped item: {stack.pop()}")
+print(f"Stack size after pop: {stack.size()}")