python lxml庫生成xml文件-節點命名空間問題

lxml庫，處理xml很強大，官方文檔：https://lxml.de/tutorial.html#namespaces

例如：

我們要生成如下格式的報文：

<ttt:jesson xmlns:ttt="http://www.hellojesson/ttt" guid="33344555677777777777" version="1.0" xsi="http://www.hahaha.com">
  <ttt:order>
    <ttt:orderhead>
      <ttt:guid/>
    </ttt:orderhead>
  </ttt:order>
</ttt:jesson>

就可以參考如下的樣例代碼實現：

# 導入庫
import lxml.etree as etree

# 注冊指定命名空間
etree.register_namespace("ttt", "http://www.hellojesson/ttt")

# 生成根節點
root = etree.Element("{http://www.hellojesson/ttt}jesson", xsi="http://www.hahaha.com", guid="33344555677777777777", version="1.0")
# 生成子節點：
order = etree.SubElement(root, "{http://www.hellojesson/ttt}order")
orderhead = etree.SubElement(order, "{http://www.hellojesson/ttt}orderhead")
guid = etree.SubElement(orderhead, "{http://www.hellojesson/ttt}guid")

# 節點賦值
order.text = "text"
orderhead.text = "111"
guid.text = "hello nihao"

# 輸出 查看效果
print(etree.tostring(root, pretty_print=True))