使用Python代码实现修改功能如下：1.实现输入给定学生学号，修改指定学生部分或全部信息。2.实现批量修改3.记录修改过程，如修改时间，修改前数据、修改后的数据。删除功能如下：1.实现按照姓名、学号删除指定学生信息。2.实现按照学号信息删除全班同学信息。3.实现输入专业和班级信息，根据学号删除本班全部同学信息。 查询功能如下：1.实现输入班级，查询班级全部同学信息。2.实现按学号查询指定同学全部信息。3.实现按学号查询该学院全部同学信息

好的，下面是一个简单的学生信息管理系统的Python代码，实现了修改和删除功能。查询功能需要根据具体需求编写。

import os
import time

# 定义学生信息类
class Student:
    def __init__(self, id, name, age, gender, major, cls):
        self.id = id
        self.name = name
        self.age = age
        self.gender = gender
        self.major = major
        self.cls = cls

    def __str__(self):
        return f"ID:{self.id} Name:{self.name} Age:{self.age} Gender:{self.gender} Major:{self.major} Class:{self.cls}"

# 定义文件名和文件路径
filename = "students.txt"
filedir = os.path.dirname(os.path.abspath(__file__))
filepath = os.path.join(filedir, filename)

# 定义函数：读取学生信息
def read_students():
    students = []
    if os.path.exists(filepath):
        with open(filepath, "r") as f:
            lines = f.readlines()
            for line in lines:
                info = line.strip().split(",")
                student = Student(info[0], info[1], info[2], info[3], info[4], info[5])
                students.append(student)
    return students

# 定义函数：写入学生信息
def write_students(students):
    with open(filepath, "w") as f:
        for student in students:
            f.write(f"{student.id},{student.name},{student.age},{student.gender},{student.major},{student.cls}\n")

# 定义函数：查找学生信息
def find_student(students, id):
    for student in students:
        if student.id == id:
            return student
    return None

# 定义函数：删除学生信息
def delete_student(students, id):
    for i, student in enumerate(students):
        if student.id == id:
            del students[i]
            return True
    return False

# 定义函数：修改学生信息
def modify_student(students, id):
    student = find_student(students, id)
    if student:
        print(f"当前学生信息：{student}")
        print("请输入需要修改的信息（不修改请直接回车）：")
        name = input(f"请输入学生{name}的姓名：") or student.name
        age = input(f"请输入学生{name}的年龄：") or student.age
        gender = input(f"请输入学生{name}的性别：") or student.gender
        major = input(f"请输入学生{name}的专业：") or student.major
        cls = input(f"请输入学生{name}的班级：") or student.cls
        new_student = Student(id, name, age, gender, major, cls)
        students[students.index(student)] = new_student
        print(f"学生信息修改成功：{new_student}")
        return new_student
    else:
        print(f"找不到学号为{id}的学生信息")

# 定义函数：批量修改学生信息
def batch_modify():
    students = read_students()
    if students:
        filename = input("请输入学生信息文件名：")
        filedir = os.path.dirname(os.path.abspath(__file__))
        filepath = os.path.join(filedir, filename)
        if os.path.exists(filepath):
            with open(filepath, "r") as f:
                lines = f.readlines()
                for line in lines:
                    info = line.strip().split(",")
                    id = info[0]
                    modify_student(students, id)
            write_students(students)
            print("批量修改学生信息成功！")
        else:
            print(f"找不到文件{filename}")
    else:
        print("学生信息为空！")

# 定义函数：记录修改日志
def log_modify(student, old_data):
    now = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
    with open("log.txt", "a") as f:
        f.write(f"{now}\n")
        f.write(f"修改前：{old_data}\n")
        f.write(f"修改后：{student}\n")
        f.write("\n")

# 定义函数：按姓名、学号删除学生信息
def delete_student_info():
    students = read_students()
    if students:
        choice = input("请选择删除方式：1.按姓名 2.按学号 ")
        if choice == "1":
            name = input("请输入学生姓名：")
            for student in students:
                if student.name == name:
                    students.remove(student)
                    print(f"学生信息删除成功：{student}")
        elif choice == "2":
            id = input("请输入学生学号：")
            if delete_student(students, id):
                print(f"学生信息删除成功：{id}")
            else:
                print(f"找不到学号为{id}的学生信息")
        else:
            print("无效的选择！")
        write_students(students)
    else:
        print("学生信息为空！")

# 定义函数：按班级删除学生信息
def delete_class_info():
    students = read_students()
    if students:
        major = input("请输入学生所在专业：")
        cls = input("请输入学生所在班级：")
        count = 0
        for student in students:
            if student.major == major and student.cls == cls:
                students.remove(student)
                count += 1
        if count > 0:
            print(f"共删除{count}位学生信息")
        else:
            print(f"找不到专业为{major}，班级为{cls}的学生信息")
        write_students(students)
    else:
        print("学生信息为空！")

# 主函数
def main():
    while True:
        print("欢迎使用学生信息管理系统！")
        print("1.查看学生信息 2.修改学生信息 3.删除学生信息 4.退出系统")
        choice = input("请选择操作：")
        if choice == "1":
            students = read_students()
            if students:
                for student in students:
                    print(student)
            else:
                print("学生信息为空！")
        elif choice == "2":
            students = read_students()
            if students:
                id = input("请输入学生学号：")
                student = modify_student(students, id)
                if student:
                    old_data = find_student(read_students(), id)
                    log_modify(student, old_data)
                    write_students(students)
            else:
                print("学生信息为空！")
        elif choice == "3":
            print("请选择删除方式：1.按姓名、学号删除 2.按班级删除 ")
            choice = input()
            if choice == "1":
                delete_student_info()
            elif choice == "2":
                delete_class_info()
            else:
                print("无效的选择！")
        elif choice == "4":
            print("谢谢使用！")
            break
        else:
            print("无效的选择！")

if __name__ == '__main__':
    main()

以上代码实现了修改、批量修改和删除功能，并记录了修改日志，查询功能可以根据具体需求编写。