def foo(science):

    for record in open('sslc1.txt'):

        fields = record.split(';')

        region_code = fields[0].strip()

        score_str = fields[6].strip()

        score = int(score_str) if score_str != 'AA' \

                               else 0

        if score > 90:

            science[region_code] += 1

def bar():

    science = {}

    science = foo(science)

    pie(science.values(), labels=science.keys())

    savefig('science.png')

if __name__ == '__main__':

    bar()