code: def process_win_streak(data):
      
      #only do this if there are non-NANs in the column
      if data['Streak'].count()>0:
          data['Streak2'] = data['Streak'].str.len()
          data.loc[data['Streak'].str[0]=='-','Streak2'] = -data['Streak2']
          data['Streak'] = data['Streak2']
          data = data.drop('Streak2',1)
      return data
docs: Convert "+++"/"---" formatted win/loss streak column into a +/- integer column