def dowload_excel(req):      import openpyxl      from openpyxl.cell import get_column_letter      response = HttpResponse(content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')      response['Content-Disposition'] = 'attachment; filename=mymodel.xlsx'      wb = openpyxl.Workbook(write_only=True)      ws = wb.get_active_sheet()      ws.title = "MyModel"        row_num = 0        columns = [          (u"ID", 15),          (u"23收到", 70),          (u"Description", 70),      ]        for col_num in xrange(len(columns)):          c = ws.cell(row=row_num + 1, column=col_num + 1)          c.value = columns[col_num][0]          c.style.font.bold = True          # set column width          ws.column_dimensions[get_column_letter(col_num+1)].width = columns[col_num][1]      queryset = [{"pk":1, "title":"aaa", "description":"description111"},                  {"pk":2, "title":"asd阿斯顿", "description":"123123asdsadasd阿斯顿asd "}]      for obj in queryset:          row_num += 1          row = [              obj["pk"],              obj["title"],              obj["description"],          ]          for col_num in xrange(len(row)):              c = ws.cell(row=row_num + 1, column=col_num + 1)              c.value = row[col_num]              c.style.alignment.wrap_text = True        wb.save(response)      return response