dataclasses

from dataclasses import dataclass, field, asdict
from typing import List

@dataclass(order=True)
class Student:
    name: str
    grade: float
    subjects: List[str] = field(default_factory=list)

    def gpa_letter(self) -> str:
        if self.grade >= 90: return 'A'
        if self.grade >= 80: return 'B'
        if self.grade >= 70: return 'C'
        return 'D'

students = [
    Student("Alice",   94.5, ["Math", "Physics"]),
    Student("Bob",     78.2, ["History", "English"]),
    Student("Charlie", 88.0, ["CS", "Math", "Bio"]),
]

for s in sorted(students, reverse=True):
    print(f"{s.name:<10} GPA={s.grade:.1f} ({s.gpa_letter()}) — {', '.join(s.subjects)}")

print("\nAs dicts:")
for row in students:
    print(asdict(row))