定义一个学生类，创建两个学生对象，实现二人对话。

好的，以下是实现代码：

class Student:
    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.gender = gender

    def introduce(self):
        print("My name is %s, I am %d years old, and I am %s." % (self.name, self.age, self.gender))

# 创建两个学生对象
student1 = Student("Tom", 18, "male")
student2 = Student("Lucy", 17, "female")

# 二人对话
print("Student1: ")
student1.introduce()
print("Student2: ")
student2.introduce()

输出结果如下：

Student1: 
My name is Tom, I am 18 years old, and I am male.
Student2: 
My name is Lucy, I am 17 years old, and I am female.

这样就实现了两个学生对象之间的对话。