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| from typing import List, Dict, Optional
from datetime import datetime
class Student:
"""学生类"""
def __init__(self, student_id: str, name: str, age: int):
self.student_id = student_id
self.name = name
self.age = age
self.courses: List['Course'] = []
self.scores: Dict[str, float] = {}
def enroll(self, course: 'Course'):
"""选课"""
if course not in self.courses:
self.courses.append(course)
course.add_student(self)
def add_score(self, course_name: str, score: float):
"""添加成绩"""
self.scores[course_name] = score
def get_average(self) -> float:
"""获取平均分"""
if not self.scores:
return 0
return sum(self.scores.values()) / len(self.scores)
def get_info(self) -> str:
"""获取学生信息"""
return f"{self.name}({self.student_id}), 年龄: {self.age}, 平均分: {self.get_average():.1f}"
def __str__(self):
return self.get_info()
def __repr__(self):
return f"Student({self.student_id}, {self.name})"
class Course:
"""课程类"""
def __init__(self, course_id: str, name: str, credit: int = 3):
self.course_id = course_id
self.name = name
self.credit = credit
self.students: List[Student] = []
self.teacher: Optional[str] = None
def add_student(self, student: Student):
"""添加学生"""
if student not in self.students:
self.students.append(student)
def set_teacher(self, teacher_name: str):
"""设置教师"""
self.teacher = teacher_name
def get_student_count(self) -> int:
"""获取学生数量"""
return len(self.students)
def get_average_score(self) -> float:
"""获取课程平均分"""
scores = [s.scores.get(self.name, 0) for s in self.students if self.name in s.scores]
return sum(scores) / len(scores) if scores else 0
def __str__(self):
return f"{self.name}({self.course_id}), 学分: {self.credit}, 学生: {self.get_student_count()}人"
class GradeBook:
"""成绩管理类"""
def __init__(self):
self.students: Dict[str, Student] = {}
self.courses: Dict[str, Course] = {}
def add_student(self, student_id: str, name: str, age: int):
"""添加学生"""
student = Student(student_id, name, age)
self.students[student_id] = student
return student
def add_course(self, course_id: str, name: str, credit: int = 3):
"""添加课程"""
course = Course(course_id, name, credit)
self.courses[course_id] = course
return course
def enroll_student(self, student_id: str, course_id: str):
"""学生选课"""
student = self.students.get(student_id)
course = self.courses.get(course_id)
if student and course:
student.enroll(course)
def record_score(self, student_id: str, course_name: str, score: float):
"""记录成绩"""
student = self.students.get(student_id)
if student:
student.add_score(course_name, score)
def get_student_ranking(self) -> List[Student]:
"""获取学生排名（按平均分）"""
return sorted(self.students.values(), key=lambda s: s.get_average(), reverse=True)
def get_course_report(self, course_id: str) -> Dict:
"""获取课程报告"""
course = self.courses.get(course_id)
if not course:
return {}
return {
'course_name': course.name,
'student_count': course.get_student_count(),
'average_score': course.get_average_score(),
'teacher': course.teacher
}
def export_report(self) -> str:
"""导出报告"""
lines = ["=== 学生成绩管理系统报告 ===", ""]
lines.append("【课程统计】")
for course in self.courses.values():
lines.append(f" {course}")
lines.append("")
lines.append("【学生排名】")
for i, student in enumerate(self.get_student_ranking(), 1):
lines.append(f" 第{i}名: {student.get_info()}")
return "\n".join(lines)
grade_book = GradeBook()
grade_book.add_student("S001", "张三", 20)
grade_book.add_student("S002", "李四", 19)
grade_book.add_student("S003", "王五", 21)
math = grade_book.add_course("MATH101", "高等数学", 4)
english = grade_book.add_course("ENG101", "大学英语", 3)
grade_book.enroll_student("S001", "MATH101")
grade_book.enroll_student("S001", "ENG101")
grade_book.enroll_student("S002", "MATH101")
grade_book.enroll_student("S003", "MATH101")
grade_book.record_score("S001", "高等数学", 95)
grade_book.record_score("S001", "大学英语", 88)
grade_book.record_score("S002", "高等数学", 82)
grade_book.record_score("S003", "高等数学", 90)
print(grade_book.export_report())
|
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