Redirecting stderr for extension modules

[Jeff Epler]

Michael,
I think that what happens is that the return value (a tuple) is
constructed in the line
    return result, stderr
and then the body of the 'finally' is executed, setting stderr to a
different value.

You can write it this way (with the repeated 'if file: ...' block)

try:
    result = fn( *args, *kwds)
except:
    if file: ...
    raise
else:
    if file: ...
    return result, stderr

Jeff