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As it happens, I was hunting for Python shadow password support
and came across this patch.    The module isn't Solaris-specific, and 
would be necessary on Linux, too.
However, the interface for getting shadow passwords doesn't seem 
to be standardized; see http://www.unixpapa.com/incnote/passwd.
html for a list.  (The Single Unix spec doesn't seem to mention 
shadow passwords.)

One question is whether we want a new module for this, or if the 
functions should be in the existing pwd module.