[Tutor] I don't understand example 12.10.2

[Daniel Nash]

Following my previous message, I have done a little bit more reading and I 
think that data is a "string buffer"?

But i don't get why the line

mimetools.decode(file, data, submsg.getencoding())

doesn't use 'submsg' instead of 'file' for the input

Is it something to do with the way file.next() works?

Dan

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