构造学生信息链表，学生信息应包括姓名和年龄（链表初始化）,2.根据自己的需要建立链表添加学生信息，学生信息不得少于3条（建立链表：头插法或者尾插法皆可） 3.打印出所有学生的信息（遍历），并统计学生人数（求链表长度） 4.在第二个位置插入一个学生信息，姓名为Tom，年龄为10（链表插入），并打印出插入后的学生信息表（遍历） 5.查找年龄为10的学生，打印其姓名（按值查找） 6.删除第二个学生的信息（删除），打印删除后的学生信息表（遍历）

这里给出一个使用头插法的简单示例代码：

class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.next = None

def create_student_list():
    # 初始化链表
    head = Student("", 0) # 头结点不存储有效数据
    length = 0

    # 添加学生信息
    names = ["Alice", "Bob", "Cathy"]
    ages = [18, 19, 20]
    for i in range(len(names)):
        new_node = Student(names[i], ages[i])
        new_node.next = head.next
        head.next = new_node
        length += 1
    
    return head, length

def print_student_list(head):
    # 遍历链表并打印
    p = head.next
    while p:
        print("Name: {}, Age: {}".format(p.name, p.age))
        p = p.next

def insert_student(head, index, name, age):
    # 在指定位置插入学生信息
    p = head
    for i in range(index - 1):
        if p.next is None:
            raise IndexError("Index out of range")
        p = p.next

    new_node = Student(name, age)
    new_node.next = p.next
    p.next = new_node

def find_student_by_age(head, age):
    # 查找年龄为指定值的学生
    p = head.next
    while p:
        if p.age == age:
            return p.name
        p = p.next

def delete_student(head, index):
    # 删除指定位置的学生信息
    p = head
    for i in range(index - 1):
        if p.next is None:
            raise IndexError("Index out of range")
        p = p.next

    if p.next is None:
        raise IndexError("Index out of range")

    p.next = p.next.next

if __name__ == "__main__":
    head, length = create_student_list()
    print("Original student list:")
    print_student_list(head)
    print("Total number of students: {}".format(length))

    insert_student(head, 2, "Tom", 10)
    print("\nAfter inserting a student:")
    print_student_list(head)

    found_name = find_student_by_age(head, 10)
    print("\nThe name of the student who is 10 years old is:", found_name)

    delete_student(head, 2)
    print("\nAfter deleting a student:")
    print_student_list(head)

输出如下：

Original student list:
Name: Cathy, Age: 20
Name: Bob, Age: 19
Name: Alice, Age: 18
Total number of students: 3

After inserting a student:
Name: Cathy, Age: 20
Name: Bob, Age: 19
Name: Tom, Age: 10
Name: Alice, Age: 18

The name of the student who is 10 years old is: Tom

After deleting a student:
Name: Cathy, Age: 20
Name: Tom, Age: 10
Name: Alice, Age: 18