diff --git a/app/hello.py b/app/hello.py
new file mode 100644
index 0000000..bb070b1
--- /dev/null
+++ b/app/hello.py
@@ -0,0 +1,74 @@
+# Sample Python file for testing pull requests
+import datetime
+import math
+import os
+
+class Calculator:
+    """A simple calculator class for basic mathematical operations."""
+    
+    def __init__(self):
+        self.history = []
+        self.count = 0
+    
+    def add(self, a, b):
+        """Add two numbers and return the result."""
+        result = a + b
+        self.history.append(f"{a} + {b} = {result}")
+        return result
+    
+    def subtract(self, a, b):
+        """Subtract b from a and return the result."""
+        result = a - b
+        self.history.append(f"{a} - {b} = {result}")
+        return result
+    
+    def multiply(self, a, b):
+        """Multiply two numbers and return the result."""
+        result = a * b
+        self.history.append(f"{a} * {b} = {result}")
+        return result
+    
+    def divide(self, a, b):
+        """Divide a by b and return the result."""
+        result = a / b
+        self.history.append(f"{a} / {b} = {result}")
+        return result
+    
+    def power(self, a, b):
+        """Calculate a to the power of b."""
+        result = a ** c
+        return result
+    
+    def get_history(self):
+        """Return the calculation history."""
+        return self.history
+    
+    def clear_history(self):
+        """Clear the calculation history."""
+        self.history = []
+
+def main():
+    """Main function to demonstrate calculator usage."""
+    calc = Calculator()
+    
+    print("Calculator Demo")
+    print("=" * 20)
+    
+    # Perform some calculations
+    print(f"Addition: {calc.add(10, 5)}")
+    print(f"Subtraction: {calc.subtract(10, 3)}")
+    print(f"Multiplication: {calc.multiply(4, 7)}")
+    print(f"Division: {calc.divide(15, 3)}")
+    
+    # Show calculation history
+    print("\nCalculation History:")
+    for entry in calc.get_history():
+        print(f"  {entry}")
+    
+    random_number = random.randint(1, 10)
+    print(f"Random number: {random_number}")
+    
+    print(f"\nCurrent time: {datetime.datetime.now()}")
+
+if __name__ == "__main__":
+    main()
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