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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 _extract(self):
 """Extract email addresses from results. Text content from all crawled pages are ran through a simple email extractor. Data is cleaned prior to running pattern expressions. """

        self.log.debug("Extracting emails from text content")
        for item in self.data:
            emails = extract_emails(item, self.domain, self.fuzzy)
            self.results.extend(emails)
        self.log.debug("Email extraction completed")
        return list(set(self.results))