[Biopython] parsing an in memory sequence string with SeqIO

[Michael Thon]

I have been looking at the documentation but I can't figure out how to  
parse a string of text in a python variable into a SeqRecord object.   
the main function (SeqIO.parse) requires a file handle.  I'm getting  
the text from a web server POST request and it seems a little  
inefficient to write it to a file before I do parsing with biopython.   
Maybe there is some way in python to create a handle to a variable?
Thanks
Mike