Code:
for district in query:
self.response.out.write('<tr><td bgcolor="#ffffff" style="font-family:arial;font-size:12px">')
self.response.out.write(district.Dis_Id)
self.response.out.write('</td><td bgcolor="#ffffff" style="font-family:arial;font-size:12px">')
self.response.out.write(district.Dis_Name)
self.response.out.write('</td><td