Can you help me write a python function to update the status of a customer's order in an SQLite database. There are two tables: orders which has orderID (Primary Key), customerID (Foreign Key), orderDate, orderTotal, and orderStatus. There is also a customer table: customerID (Primary Key), customerName, customerAddress, customerEmail. The function should take orderStatus and orderID as inputs.
Sure, here's an example of a Python function that updates the status of a customer's order in an SQLite database:

```
import sqlite3

def update_order_status(order_status, order_id):
    conn = sqlite3.connect("database.db")
    cursor = conn.cursor()
    
    update_query = "UPDATE orders SET orderStatus = ? WHERE orderID = ?"
    cursor.execute(update_query, (order_status, order_id))
    
    conn.commit()
    conn.close()
    
    return "Order status updated successfully"```

In this function, we first import the sqlite3 module. Then, we define a function `update_order_status` that takes two inputs: `order_status` and `order_id`.

Next, we create a connection to the SQLite database and get a cursor to execute the queries. We then create an update query to update the `orderStatus` of the order with the given `order_id`. We use the execute method to execute the query with the given parameters.

Finally, we commit the changes to the database and close the connection. The function returns a message indicating that the order status was updated successfully.