Yakuniy loyiha: talabalar jurnali

"""Talabalar jurnali: talabalar, baholar, JSON ga saqlash va txt hisobot."""
import json
from dataclasses import asdict, dataclass, field
from pathlib import Path

BAHOLAR = (2, 3, 4, 5)


@dataclass
class Talaba:
    ism: str
    guruh: str
    baholar: dict = field(default_factory=dict)

    def baho_qosh(self, fan, baho):
        if baho not in BAHOLAR:
            raise ValueError(f"Baho 2 dan 5 gacha bo'lishi kerak, berildi: {baho}")
        self.baholar.setdefault(fan, []).append(baho)

    @property
    def ortacha(self):
        hammasi = [b for royxat in self.baholar.values() for b in royxat]
        return sum(hammasi) / len(hammasi) if hammasi else 0.0


class Jurnal:
    def __init__(self, fayl="jurnal.json"):
        self.fayl = Path(fayl)
        self.talabalar = {}
        self.yukla()

    def yukla(self):
        try:
            royxat = json.loads(self.fayl.read_text(encoding="utf-8"))
        except FileNotFoundError:
            return
        except json.JSONDecodeError:
            print(f"Ogohlantirish: {self.fayl} buzilgan, bo'sh jurnal ochildi")
            return
        self.talabalar = {d["ism"]: Talaba(**d) for d in royxat}

    def saqla(self):
        royxat = [asdict(t) for t in self.talabalar.values()]
        self.fayl.write_text(json.dumps(royxat, ensure_ascii=False, indent=2), encoding="utf-8")

    def talaba_qosh(self, ism, guruh):
        ism = ism.strip().title()
        if not ism:
            raise ValueError("Ism bo'sh bo'lmasin")
        if ism in self.talabalar:
            raise ValueError(f"{ism} allaqachon bor")
        self.talabalar[ism] = Talaba(ism, guruh.strip().upper())
        return self.talabalar[ism]

    def topish(self, ism):
        talaba = self.talabalar.get(ism.strip().title())
        if talaba is None:
            raise KeyError(f"{ism} degan talaba yo'q")
        return talaba

    def reyting(self, guruh=None):
        royxat = [t for t in self.talabalar.values() if guruh is None or t.guruh == guruh]
        return sorted(royxat, key=lambda t: t.ortacha, reverse=True)

    def hisobot(self, fayl="hisobot.txt"):
        sarlavha = "#".ljust(3) + "Talaba".ljust(20) + "Guruh".ljust(7) + "Baho".rjust(6) + "O'rtacha".rjust(10)
        qatorlar = [sarlavha, "-" * len(sarlavha)]
        for i, t in enumerate(self.reyting(), start=1):
            soni = sum(len(r) for r in t.baholar.values())
            qatorlar.append(f"{i:<3}{t.ism:<20}{t.guruh:<7}{soni:>6}{t.ortacha:>10.2f}")
        matn = "\n".join(qatorlar) + "\n"
        Path(fayl).write_text(matn, encoding="utf-8")
        return matn

from pathlib import Path
from jurnal import Jurnal

Path("jurnal.json").unlink(missing_ok=True)

j = Jurnal()
j.talaba_qosh("sarvinoz karimova", "ai-1")
j.talaba_qosh("ali valiyev", "ai-1")
j.talaba_qosh("otabek", "ai-2")

j.topish("Sarvinoz Karimova").baho_qosh("Python", 5)
j.topish("sarvinoz karimova").baho_qosh("Matematika", 4)
j.topish("Ali Valiyev").baho_qosh("Python", 4)
j.topish("Ali Valiyev").baho_qosh("Python", 3)
j.topish("Otabek").baho_qosh("Python", 5)

for t in j.reyting():
    print(f"{t.ism:<18}{t.guruh:<6}{t.ortacha:.2f}  {t.baholar}")

sinovlar = [
    lambda: j.talaba_qosh("Otabek", "ai-2"),
    lambda: j.talaba_qosh("   ", "ai-1"),
    lambda: j.topish("Javohir"),
    lambda: j.topish("Otabek").baho_qosh("Python", 7),
]
for sinov in sinovlar:
    try:
        sinov()
    except (ValueError, KeyError) as e:
        print(f"{type(e).__name__}: {e}")

j.saqla()
print(Path("jurnal.json").read_text(encoding="utf-8")[:260], "...")

yangi = Jurnal()
print("Qayta yuklandi:", len(yangi.talabalar), "talaba")
print("Sarvinozning o'rtachasi:", yangi.topish("sarvinoz karimova").ortacha)

print(yangi.hisobot())

from jurnal import Jurnal

MENYU = """
1 - talaba qo'shish
2 - baho qo'yish
3 - reyting
4 - hisobot (txt)
0 - chiqish"""


def talaba_qosh(j):
    j.talaba_qosh(input("Ism familiya: "), input("Guruh: "))
    print("Qo'shildi.")


def baho_qoy(j):
    talaba = j.topish(input("Talaba: "))
    fan = input("Fan: ").strip().capitalize()
    matn = input("Baho (2-5): ").strip()
    if not matn.isdigit():
        raise ValueError(f"'{matn}' — son emas")
    baho = int(matn)
    talaba.baho_qosh(fan, baho)
    print(f"{talaba.ism}: {fan} — {baho}")


def reyting(j):
    for i, t in enumerate(j.reyting(), start=1):
        print(f"{i}. {t.ism} ({t.guruh}) — {t.ortacha:.2f}")


def hisobot(j):
    j.hisobot()
    print("hisobot.txt yozildi.")


AMALLAR = {"1": talaba_qosh, "2": baho_qoy, "3": reyting, "4": hisobot}


def main():
    j = Jurnal()
    print(f"Jurnal ochildi: {len(j.talabalar)} talaba.")
    while True:
        print(MENYU)
        tanlov = input("Tanlang: ").strip()
        if tanlov == "0":
            j.saqla()
            print("Saqlandi. Xayr!")
            break
        amal = AMALLAR.get(tanlov)
        if amal is None:
            print("Bunday band yo'q.")
            continue
        try:
            amal(j)
            j.saqla()
        except ValueError as e:
            print("Xato:", e)
        except KeyError as e:
            print("Xato:", e.args[0])


if __name__ == "__main__":
    main()

import dastur
dastur.main()

from jurnal import Jurnal

j = Jurnal()
print(len(j.talabalar), "talaba")
print(j.hisobot())