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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _printf(self, *args, **kwargs):
        '''Print to configured stream if any is specified and the file argument
        is not already set for this specific call.
        '''
        if self._stream and not kwargs.get('file'):
            kwargs['file'] = self._stream
        _printf(*args, **kwargs)