feral-student

byNandu Katasani

import json import os class StudentManagementSystem: def __init__(self, filename="students.json"): self.filename = filename self.students = self.load_data() def load_data(self): if os.path.exists(self.filename): with open(self.filename, "r") as f: return json.load(f) return {} def save_data(self): with open(self.filename, "w") as f: json.dump(self.students, f, indent=4) def add_student(self): print("\n--- Add Student ---") roll = input("Roll Number: ").strip() if roll in self.students: print("Student already exists!") return name = input("Name: ").strip() age = self.get_int("Age: ") marks = { sub: self.get_float(f"{sub} marks (0-100): ", 0, 100) for sub in ["Math", "Science", "English"] } self.students[roll] = {"name": name, "age": age, "marks": marks} self.save_data() print(f"Student '{name}' added!") def view_all(self): if not self.students: print("No students found!") return print(f"\n{'Roll':<8}{'Name':<15}{'Age':<6}{'Math':<8}{'Sci':<8}{'Eng':<8}{'Avg':<8}") print("-" * 61) for roll, info in self.students.items(): m = info["marks"] avg = sum(m.values()) / len(m) print(f"{roll:<8}{info['name']:<15}{info['age']:<6}" f"{m['Math']:<8}{m['Science']:<8}{m['English']:<8}{avg:<8.2f}") def search_student(self): roll = input("Roll Number: ").strip() if roll in self.students: info = self.students[roll] avg = sum(info["marks"].values()) / len(info["marks"]) print(f"\nName : {info['name']}") print(f"Age : {info['age']}") print(f"Marks : {info['marks']}") print(f"Average: {avg:.2f}") print(f"Grade : {self.get_grade(avg)}") else: print("Student not found!") def delete_student(self): roll = input("Roll Number: ").strip() if roll in self.students: name = self.students[roll]["name"] if input(f"Delete '{name}'? (y/n): ").lower() == "y": del self.students[roll] self.save_data() print(f"'{name}' deleted!") else: print("Student not found!") def show_topper(self): if not self.students: print("No students!") return topper = max(self.students.items(), key=lambda x: sum(x[1]["marks"].values())) roll, info = topper avg = sum(info["marks"].values()) / len(info["marks"]) print(f"Topper: {info['name']} (Roll: {roll}) — Avg: {avg:.2f}") @staticmethod def get_grade(avg): if avg >= 90: return "A+" elif avg >= 80: return "A" elif avg >= 70: return "B" elif avg >= 60: return "C" elif avg >= 50: return "D" else: return "Fail" @staticmethod def get_int(prompt): while True: try: return int(input(prompt)) except: print("Enter valid integer!") @staticmethod def get_float(prompt, mn=None, mx=None): while True: try: v = float(input(prompt)) if (mn is not None and v < mn) or (mx is not None and v > mx): raise ValueError return v except: print(f"Enter valid number ({mn}-{mx})!") def run(self): while True: print("\n=============================") print(" STUDENT MANAGEMENT SYSTEM ") print("=============================") print("1. Add Student") print("2. View All Students") print("3. Search Student") print("4. Delete Student") print("5. Show Topper") print("6. Exit") print("=============================") choice = input("Choice (1-6): ").strip() if choice == "1": self.add_student() elif choice == "2": self.view_all() elif choice == "3": self.search_student() elif choice == "4": self.delete_student() elif choice == "5": self.show_topper() elif choice == "6": print("Goodbye!"); break else: print("Invalid choice!") if __name__ == "__main__": sms = StudentManagementSystem() sms.run() this code is good could pls give if imagine b.tech student version