python3封装一个学生类，有姓名，有年龄，有性别，有英语成绩，数学成绩，语文成绩；求总分，平均分，以及打印输出学生的相关信息。

可以这样实现：

class Student:
    def __init__(self, name, age, gender, english_score, math_score, chinese_score):
        self.name = name
        self.age = age
        self.gender = gender
        self.english_score = english_score
        self.math_score = math_score
        self.chinese_score = chinese_score
    
    def total_score(self):
        return self.english_score + self.math_score + self.chinese_score
    
    def average_score(self):
        return self.total_score() / 3
    
    def print_info(self):
        print("Name:", self.name)
        print("Age:", self.age)
        print("Gender:", self.gender)
        print("English score:", self.english_score)
        print("Math score:", self.math_score)
        print("Chinese score:", self.chinese_score)
        print("Total score:", self.total_score())
        print("Average score:", self.average_score())

然后可以创建一个学生对象并调用相关方法：

student = Student("Tom", 18, "Male", 80, 90, 85)
student.print_info()

输出：

Name: Tom
Age: 18
Gender: Male
English score: 80
Math score: 90
Chinese score: 85
Total score: 255
Average score: 85.0