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in py3k, the following simple code will throw an uncatched exception when executed with pythonw:
import warnings
warnings.warn('test')
the problem occurs in showarning function: in py3k's pythonw , stderr/stdout is set to None, so the file.write(...) statement will thorw AttributeError uncatched. I think a catch-all except(delete 'OSError') can solve this.
def showwarning(message, category, filename, lineno, file=None, line=None):
 """Hook to write a warning to a file; replace if you like."""
 if file is None:
 file = sys.stderr
 try:
 file.write(formatwarning(message, category, filename, lineno, line))
 except OSError:
 pass # the file (probably stderr) is invalid - this warning gets lost.