lab12,13.py

school = {'1a':24,'1b':21,'2a':19,'2b':25,'3a':35,'4a':15,'4b':22,'5a':16,'5b':27,'6a':15,'6b':17}
print('1a -',school['1a'])
print('1b -',school['1b'])
print('2a -',school['2a'])
print('2b -',school['2b'])
print('3a -',school['3a'])
print('4a -',school['4a'])
print('4b -',school['4b'])
print('5a -',school['5a'])
print('5b -',school['5b'])
print('6a -',school['6a'])
print('6b -',school['6b'])
school['2b']=20
school['3a']=30
school['5a']=28
del(school['5b'])
school['3b']=12
school['7a']=21
print('1a -',school['1a'])
print('1b -',school['1b'])
print('2a -',school['2a'])
print('2b -',school['2b'])
print('3a -',school['3a'])
print('3b -',school['3b'])
print('4a -',school['4a'])
print('4b -',school['4b'])
print('5a -',school['5a'])
print('6a -',school['6a'])
print('6b -',school['6b'])
print('7a -',school['7a'])