构造lxml.etree从json禁用excaping

import lxml.etree as ET

print ("Desired:")
print (ET.tostring(string_res, encoding='utf-8', method='xml'))
string_res.text = ''
string_res.text = value['Value']

print ("Desired:")
print string_res.text

print ("Not desired:")
print (ET.tostring(string_res, encoding='utf-8', method='xml'))

结果是

Desired:
<![CDATA[<b>hello</b>]]>

Desired:
<![CDATA[<b>hello</b>]]>

Not desired:
&lt;![CDATA[&lt;b&gt;hello&lt;/b&gt;]]&gt;