sportsref/nfl/teams.py
def sos(self, year):
        """Returns the SOS (Strength of Schedule) for a team in a year, based
        on SRS.

        :year: The year for the season in question.
        :returns: A float of SOS.
        """
        try:
            sos_text = self._year_info_pq(year, 'SOS').text()
        except ValueError:
            return None
        m = re.search(r'SOS\s*:\s*(\S+)', sos_text)
        if m:
            return float(m.group(1))
        else:
            return None
def sos(self, year):
        """Returns the SOS (Strength of Schedule) for a team in a year, based
        on SRS.

        :year: The year for the season in question.
        :returns: A float of SOS.
        """
        try:
            sos_text = self._year_info_pq(year, 'SOS').text()
        except ValueError:
            return None
        m = re.search(r'SOS\s*:\s*(\S+)', sos_text)
        if m:
            return float(m.group(1))
        else:
            return None
Returns the SOS (Strength of Schedule) for a team in a year, based
        on SRS.

        :year: The year for the season in question.
        :returns: A float of SOS.