列表、元组、字典、集合的定义与操作

l=['Harvey','Tracy','Sam']
t={'Harvey','Tracy','Sam'}

l.append('Tracy')

print(l)

scores=[68,76,88]

d={'Harvey':68,'Tracy':76,'Sam':88}
d['Tracy']=99
d['Gareth']=111
d.pop('Sam')
print(d)


s1={'Harvey','Tracy','Sam'}
s2={'Harvey','Sam','Gareth'}
print(s1&s2)
print(s1|s2