<reponame>liyuanyuan11/Python
bestFriends=["Jerry","Mark","Justin","Jonny","Tom","Marry","Jenny","Daniel","Tony"]
print(bestFriends)
print(bestFriends[0])
bestFriends[0]="Christina"
print(bestFriends)
bestFriends.append("Frozy")
print(bestFriends)

bestFriends=["Jerry","Mark","Justin","Jonny","Tom","Marry","Jenny","Daniel","Tony"]
print(bestFriends)
print(bestFriends[0])
bestFriends[0]="Christina"
print(bestFriends)
bestFriends.append("Frozy")
print(bestFriends)