3-6
guest=["Tom", "Jack", "Marry"]
message="I want to invite "+guest[0]+" "+guest[1]+" "+guest[2]
print(message)
not_come="Jack"
guest.remove(not_come)
print(not_come+" will not come to the party")
guest.insert(1,"Mike")
print("I want to invite "+guest[0]+" "+guest[1]+" "+guest[2])
guest.append("Frank")
guest.insert(int(len(guest)/2),"Catherine")
print("The new list: "+guest[0]+" "+guest[1]+" "+guest[2]+" "+guest[3]+" "+guest[4])
3-8
place=["London","Paris","Beijing","Washington","New York"]
print(place)
print(sorted(place))
print(place)
print(sorted(place,reverse=True))
print(place)
place.reverse()
place
place.reverse()
print(place)
place.sort()
print(place)
place.sort(reverse=True)
print(place)