💻 Student Grade System

def calculate_grade(marks):
    if marks >= 90: return "A+", "Outstanding"
    if marks >= 80: return "A",  "Excellent"
    if marks >= 70: return "B",  "Good"
    if marks >= 60: return "C",  "Average"
    if marks >= 33: return "D",  "Pass"
    return "F", "Fail"

print("=== Student Grade System ===")
students = []

while True:
    print("
1. Student add karo")
    print("2. All students report")
    print("3. Grade statistics")
    print("4. Top 3 students")
    print("5. Baahar jao")
    ch = input("Choice: ")
    if ch == "1":
        name   = input("Student naam: ")
        subs   = ["Hindi", "English", "Math", "Science", "Computer"]
        marks  = {}
        for s in subs:
            marks[s] = int(input(f"  {s} marks (100 mein): "))
        total  = sum(marks.values())
        pct    = total / len(marks)
        grade, status = calculate_grade(pct)
        students.append({
            "name": name, "marks": marks,
            "total": total, "pct": pct,
            "grade": grade, "status": status
        })
        print(f"
Report: {name}")
        print(f"  Total: {total}/500 | Avg: {pct:.1f}% | Grade: {grade} ({status})")
    elif ch == "2":
        if not students:
            print("Koi student nahi!")
        else:
            sorted_s = sorted(students, key=lambda x: x["pct"], reverse=True)
            print(f"
{'Naam':15} {'Total':8} {'Avg%':8} {'Grade'}")
            print("-" * 40)
            for s in sorted_s:
                print(f"  {s['name']:13} {s['total']:8} {s['pct']:7.1f}%  {s['grade']} ({s['status']})")
    elif ch == "3":
        if students:
            grades = {}
            for s in students:
                grades[s["grade"]] = grades.get(s["grade"], 0) + 1
            print("
Grade Distribution:")
            for g, count in sorted(grades.items()):
                print(f"  {g}: {'#'*count} ({count})")
    elif ch == "4":
        top = sorted(students, key=lambda x: x["pct"], reverse=True)[:3]
        print("
Top 3 Students:")
        for i, s in enumerate(top, 1):
            print(f"  {i}. {s['name']}: {s['pct']:.1f}% ({s['grade']})")
    elif ch == "5":
        break