How to do it...

The following is the code block that draws violin plots: 

1. Read the data from a CSV file into a pandas DataFrame:

wine_quality = pd.read_csv('winequality.csv', delimiter=';')

2. Prepare the list of three attributes of wine_quality:

data = [wine_quality['alcohol'], wine_quality['fixed acidity'], 
        wine_quality['quality']]

3. Plot the violin plot:

plt.violinplot(data, showmeans=True)

4. Display the plot on the screen:

plt.show()