Errors in Amazon_Forecast_Quick_Start_Guide.ipynb

[matsumyu]

Execution fails because dateutil is not imported.

And, results_df = results_df.append(...) is the following error.
AttributeError: 'DataFrame' object has no attribute 'append'

I can run it by changing to the following code.
results_df = pd.concat([results_df, pd.DataFrame([{'timestamp' : clean_timestamp , 'value' : row['target_value'], 'source': 'actual'}])], ignore_index=True)