列表、元组、字典、集合的定义、操作与综合练习

l=['A','B','C']
t={'A','B','C'}l.append('B')print(l)scores=[66,77,88]d={'A':66,'B':77,'C':88}
d['B']=99
d['D']=111
d.pop('C')
print(d)s1={'A','B','C'}
s2={'A','C','D'}
print(s1&s2)
print(s1|s2)