L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]
def by_name(t):
    return (t[0])
def by_score(t):
    return (t[1])
L1 = sorted(L,key=by_name)
L2 = sorted(L,key=by_score,reverse=True)
print('学生名称排序:',L1)
print('成绩高低排序:',L2)