为什么字典提取不及格学生信息失败？

students = ({"赵,60"},{"钱,34"},{"孙,89"},{"李,56"},{"周,90"})for student in students:    if (students [1] < 60):       name = students [0]       score = students [1]print("姓名:{}".format(name),"成绩:{}".format(score))

students = [{"赵": 60}, {"钱": 34}, {"孙": 89}, {"李": 56}, {"周": 90}]for student in students:    name = list(student.keys())[0]    score = list(student.values())[0]    if score < 60:        print("姓名：{}，成绩：{}".format(name, score))

姓名：钱，成绩：34