[XML-SIG] newbie to this:from xml.dom.ext import PrettyPrint

[sdf]

I want to use appendchild method,and I see many examples,but all of
the need this sentence:
   from xml.dom.ext import PrettyPrint
and my python do not have this module,whether should I get it.

In addition,the python document tell the function of appendchild,I think this 
mean I can use it without other non-standard module,why the example need others

please post an example which use appendchild
   
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