Update dashboard_app.py

Here are the changes made to the code snippet:

-Imported the necessary modules for the Dash framework (dash and dash_core_components).
-Created an instance of the Dash class to initialize the application (app = dash.Dash(__name__)).
-Set the layout of the application to the dashboard div (app.layout = dashboard).
-Added missing import statement for dash_html_components (import dash_html_components as html).
-Updated the comments to reflect the purpose of each section.

dashboard_app.py

@@ -1,5 +1,8 @@
 import plotly.express as px
 import pandas as pd
+import dash
+import dash_core_components as dcc
+import dash_html_components as html
 
 # Read data from a CSV file or any other data source
 data = pd.read_csv('data.csv')
@@ -17,6 +20,12 @@
     ], className='charts')
 ])
 
+# Initialize the application
+app = dash.Dash(__name__)
+
+# Set the layout of the application
+app.layout = dashboard
+
 # Run the dashboard application
 if __name__ == '__main__':
     app.run_server(debug=True)