Вывести график Django, matplotlib, numpy

myAPP name catalog

I have models in models.py:

class Sale(models.Model):
    good = models.ForeignKey ("Good", help_text = 'Select good',  on_delete = models.SET_NULL, null =  True) 
    quantitysales = models.IntegerField (default=1, help_text = 'Enter Qty')
    datesales = models.DateField (null = True, blank = True)
    storename = models.ForeignKey ("Store", help_text = 'Select store',  on_delete = models.SET_NULL, null =  True) 

views.py пытаюсь написать функцию для вывода моей картинки, но не уверен, что делаю правильно

def sales_filter(request):
    with connection.cursor() as cursor:
        cursor.execute('''
        select datesales, alcohol, confections
            from catalog_Sale
            where datesales = %s, 
            order by datesales;
        ''', ('2020-04-10',))
    dt = np.array([ ( (x), float (y), float (z) ) for (x, y, z) in cursor ])


    fig, ax = plt.subplots()

    tm = np.array(dt[:,0])
    alcohol = np.array([ x for x in accumulate(dt[:,1]) ])
    confections = np.array([ x for x in accumulate(dt[:,2]) ])

    ax.plot(tm,alcohol)
    ax.plot(tm,confections)


    #Generate image grafic

    buf = io.BytesIO()
    fig.savefig(buf,format='PNG')
    return HttpResponse( buf.getvalue(), content_type='image/png')

My cod have error and i dont know if my cod its correct, i need help please!!!

Exception Value:

near ",": syntax error