[IronPython] how to change default encoding of string and file at runtime?

[opin2 hu]

I run IronPython0.9.6 in Win2000, System Default encoding is GBK( 
simplified Chinese ) 
in IronPythonConsole: 

>>>a= u'\u6211\u4eec' 
>>>print a
>>>f = open("1.txt", "w") 
>>>f.write( a ) 
>>>f.close() 

open the file, only "??" in 1.txt 


I grep "Encoding.ASCII" in source files, 
then replace "Encoding.ASCII" with "Encoding.Default": 

AST/Parser.cs line 44 System.Text.Encoding.ASCII -> 
System.Text.Encoding.Default 

Objects/PythonFile.cs line 202 Encoding.ASCII -> Encoding.Default 

Objects/BaseStr.cs line 108 Encoding.ASCII -> Encoding.Default 

Objects/BaseStr.cs line 188 Encoding.ASCII -> Encoding.Default 

rebuild Ironpython,  redo above test, everything works fine. 

I don't know whether it is a right way to solve the problem? 
how to change default encoding of string and file  at runtime

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