django导出excel

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