<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_team_abbreviation(self, stats):
 """ Parse the team abbreviation. The team abbreviation is embedded within the team name tag and should be special-parsed to extract it. Parameters stats : PyQuery object A PyQuery object containing the HTML from the player's stats page. Returns ------- string Returns a string of the team's abbreviation, such as 'PURDUE' for the Purdue Boilermakers. """

        team_tag = stats(PLAYER_SCHEME['team_abbreviation'])
        team = re.sub(r'.*/cbb/schools/', '', str(team_tag('a')))
        team = re.sub(r'/.*', '', team)
        return team