ogrenci_kayit_programi.py

def not_hesapla(satir):
    satir = satir[:-1]
    liste = satir.split(":")
    
    ogrenciAdi = liste[0]
    notlar = liste[1].split(",")

    not1 = int(notlar[0])
    not2 = int(notlar[1])
    not3 = int(notlar[2])

    ortalama = (not1+not2+not3)/3

    if ortalama >= 90 and ortalama <= 100:
        harf = "AA"
    elif ortalama >= 85 and ortalama <= 89:
        harf = "BA"
    elif ortalama >= 80 and ortalama <= 84:
        harf = "BB"
    elif ortalama >= 75 and ortalama <= 79:
        harf = "CB"
    elif ortalama >= 70 and ortalama <= 74:
        harf = "CC"
    elif ortalama >= 65 and ortalama <= 69:
        harf = "DC"
    elif ortalama >= 60 and ortalama <= 64:
        harf = "DD"
    elif ortalama >= 50 and ortalama <= 59:
        harf = "FD"
    else:
        harf = "FF"

    return ogrenciAdi + ": " + harf + "\n"

def ortalamalari_oku():
    with open("sinav_notlari.txt","r",encoding="utf-8") as file:
        for satir in file:
            print(not_hesapla(satir))

def not_gir():
    ad = input("Öğrenci adı: ")
    soyad = input("Öğrenci soyadı: ")
    not1 = input("Not1: ")
    not2 = input("Not2: ")
    not3 = input("Not3: ")

    with open("sinav_notlari.txt","a",encoding="utf-8") as file:
        file.write(ad+" "+ soyad+ ":"+not1+","+not2+","+not3+"\n")

def notlari_kayitEt():
    with open("sinav_notlari.txt","r",encoding="utf-8") as file:
        liste = []

        for i in file:
            liste.append(not_hesapla(i))

        with open("sonuclar.txt","w",encoding="utf-8") as file2:
            for i in liste:
                file2.write(i)


while True:
    islem = input("1- Notları oku\n2- Not gir \n3- Notları kayıt et\n4- Çıkış \n")

    if islem == "1":
        ortalamalari_oku()
    elif islem == "2":
        not_gir()
    elif islem == "3":
        notlari_kayitEt()
    else:
        pass