1. 定义学生类，包括学号、姓名、性别、成绩，并将课程成绩全部初始化为0； 2. 定义类成员函数，完成修改学生的信息，统计所有学生课程的平均成绩、最高分和最低分； 3. 输出所有学生信息； 4. 通过输入学生学号或姓名查询某学生的信息。

1.定义学生类，包括学号、姓名、性别、成绩，并将课程成绩全部初始化为0：

class Student:
def __init__(self, number, name, gender):
self.number = number
self.name = name
self.gender = gender
self.courses = {'math': 0, 'english': 0, 'history': 0, 'science': 0}

2.定义类成员函数，完成修改学生的信息，统计所有学生课程的平均成绩、最高分和最低分：

class Student:
def __init__(self, number, name, gender):
self.number = number
self.name = name
self.gender = gender
self.courses = {'math': 0, 'english': 0, 'history': 0, 'science': 0}

def update_score(self, course, score):
self.courses[course] = score

def get_average_score(self):
total_score = 0
for score in self.courses.values():
total_score += score
average_score = total_score / len(self.courses)
return average_score

def get_max_score(self):
max_score = max(self.courses.values())
return max_score

def get_min_score(self):
min_score = min(self.courses.values())
return min_score

3.输出所有学生信息：

students = [Student('001', 'Tom', 'male'), Student('002', 'Jack', 'male'), Student('003', 'Lucy', 'female')]

for student in students:
print('Student number:', student.number)
print('Student name:', student.name)
print('Student gender:', student.gender)
print('Student scores:')
for course, score in student.courses.items():
print(course, ':', score)
print('--------------------------------')

4.通过输入学生学号或姓名查询某学生的信息：

def search_student(students, input):
for student in students:
if input == student.number or input == student.name:
print('Student number:', student.number)
print('Student name:', student.name)
print('Student gender:', student.gender)
print('Student scores:')
for course, score in student.courses.items():
print(course, ':', score)
return
print('Student not found')

input = input('Please enter the student number or name:')
search_student(students, input)