typeerror 3a 27nonetype 27 object is not iterable

1This error occurs when you try to use the integer type value as an array. In simple terms, this error occurs when your program has a variable that is treated as an array by your function, but actually, that variable is an integer.

1list[]

1def write_file(data, filename): # creates file and writes list to it
2  with open(filename, 'wb') as outfile:
3    writer = csv.writer(outfile)
4    for row in data: # ABOVE ERROR IS THROWN HERE
5      writer.writerow(row)
6

1conn.execute("select name from artists order by name")
2row = conn.fetchall() #in mysql we must use fetchall() function inorder to split dataa beecause remember it is different from sqlite we use  cursor here
3for artist in row:
4    artistlist.insert(tkinter.END, artist[0])