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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 fetch(self, url):
 """ Get the feed content using 'requests' """

        try:
            r = requests.get(url, timeout=self.timeout)
        except requests.exceptions.Timeout:
            if not self.safe:
                raise
            else:
                return None
        
        # Raise 404/500 error if any
        if r and not self.safe:
            r.raise_for_status()
        
        return r.text