a=["托马斯"，"亨利"，"高登"] print(len(a)) a.append（"达克") print(a) trains.remove("高登") print(a) trains.insert(1,"佩西") print(a) trains[trains.index("迪克")]="们他给" print(a) t=trains.pop(2) print(t) print(a) for i in trains: print(i,end="")

a=["托马斯"，"亨利"，"高登"] print(len(a)) a.append（"达克") print(a) trains.remove("高登") print(a) trains.insert(1,"佩西") print(a) trains[trains.index("迪克")]="们他给" print(a) t=trains.pop(2) print(t) print(a) for i in trains: print(i,end="")