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students = list(open("students.txt", "r", encoding="utf-8"))
del students[0]
for student in students:
    data_students = student.strip().split(",")
    writer = open("%s.txt" % data_students[1], "w")
    writer.write(
        "大学英语四级考试\nCET4\n准考证\n准考证号：%s\n考生姓名：%s\n考场号：%s\n座位号：%s\n学校名称：%s\n学院系别：%s\n备注：考试须携带准考证、学生证、身份证参加考试"
        % (
            data_students[1],
            data_students[0],
            data_students[2],
            data_students[3],
            data_students[4],
            data_students[5],
        )
    )
    writer.close()

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students = open("数据/students.txt", "r", encoding="utf-8")
students.readline()
while True:
    data_students = students.readline().strip().split(",")
    if len(data_students) == 1:
        break
    writer = open("temp/%s.txt" % data_students[1], "w")
    writer.write(
        "大学英语四级考试\nCET4\n准考证\n准考证号：%s\n考生姓名：%s\n考场号：%s\n座位号：%s\n学校名称：%s\n学院系别：%s\n备注：考试须携带准考证、学生证、身份证参加考试"
        % (
            data_students[1],
            data_students[0],
            data_students[2],
            data_students[3],
            data_students[4],
            data_students[5],
        )
    )
    writer.close()
students.close()

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len("".split(","))
len("".split(" "))
len("".split())
以上计算结果分别是什么？