Writing Dictionaries into a CSV

I am working on a web scraping project, I am trying to save the results into a CSV file,

  data = { 
       'address_area': area,
       'address_district': district,
       'website': website,
       'branch_rating': rating,
       'facilities_delivery': delivery,
       'facilities_banquet': banquet,
        'facilites_shisha': shisha,
        'faciliteis_minumum': minumium,
        'facilites_reservation': reservation,
        'facilities_free_wifi': wifi,
        'facilities_smoking_permited': smoking,
        'facilities_eat_out': eat_out,
        'facilities_private_parking': parking,
        'facilities_price_range': price_range,
        'facilities_kids_ares': kids_ares,
        'branch_no': branch_no}
mainlist.append(data)
with open('filetest.csv', 'w') as f:
    writer = csv.writer(f)
    for value in mainlist:
        writer.writerow([value])

I want to save the key in the dictionary as columns and the values as a row, (keep in mind that the value pair in the dictionary refers to a variable that extracts data from a web site)

Answer

Here is a solution that can work for you. I added a second data item to your code (data2) and renamed the initial data element to data1.

mainlist = []

#initial data item
data1 = { 
       'address_area': 'area1',
       'address_district': 'district1',
       'website': 'website1',
       'branch_rating': 'rating1',
       'facilities_delivery': 'delivery1',
       'facilities_banquet': 'banquet1',
        'facilites_shisha': 'shisha1',
        'faciliteis_minumum': 'minumium1',
        'facilites_reservation': 'reservation1',
        'facilities_free_wifi': 'wifi1',
        'facilities_smoking_permited': 'smoking1',
        'facilities_eat_out': 'eat_out1',
        'facilities_private_parking': 'parking1',
        'facilities_price_range': 'price_range1',
        'facilities_kids_ares': 'kids_aresa1',
        'branch_no': 'branch_no1'}
mainlist.append(data1)

#second data item
data2 = { 
       'address_area': 'area2',
       'address_district': 'district2',
       'website': 'website2',
       'branch_rating': 'rating2',
       'facilities_delivery': 'delivery2',
       'facilities_banquet': 'banquet2',
        'facilites_shisha': 'shisha2',
        'faciliteis_minumum': 'minumium2',
        'facilites_reservation': 'reservation2',
        'facilities_free_wifi': 'wifi2',
        'facilities_smoking_permited': 'smoking2',
        'facilities_eat_out': 'eat_out2',
        'facilities_private_parking': 'parking2',
        'facilities_price_range': 'price_range2',
        'facilities_kids_ares': 'kids_aresa2',
        'branch_no': 'branch_no2'}     
mainlist.append(data2)

filename = 'filetest.csv'
headers = ",".join(data1.keys())
with open(filename, 'w') as f:
    f.write(headers + 'n')
    for item in mainlist:
        f.write(','.join(str(item[key]) for key in item) + 'n')
print("All done.  Check this file for results:",filename)