1st python assignment

1_Assignment_Python_Fundamentals/calculator.py

+def calculator():
+    while True:
+        try:
+            num1 = float(input("Enter first number: "))
+            op = input("Enter operator (+, -, *, /): ")
+            num2 = float(input("Enter second number: "))
+
+            if op == '+':
+                result = num1 + num2
+            elif op == '-':
+                result = num1 - num2
+            elif op == '*':
+                result = num1 * num2
+            elif op == '/':
+                if num2 == 0:
+                    print("Cannot divide by zero.")
+                    continue
+                result = num1 / num2
+            else:
+                print("Invalid operator.")
+
+            print(f"Result: {result}")
+            break
+        except ValueError:
+            print("Please enter valid numbers.")
+
+calculator()
+

1_Assignment_Python_Fundamentals/file.py

+import argparse
+import os
+import json
+import csv
+
+def parse_file(path, file_type):
+    if not os.path.exists(path):
+        print("File not exist.")
+        return
+
+    try:
+        if file_type == "text":
+            with open(path, "r") as f:
+                print(f.read())
+
+        elif file_type == "lines":
+            with open(path, "r") as f:
+                for i, line in enumerate(f, 1):
+                    print(f"{i}: {line.strip()}")
+
+        elif file_type == "csv":
+            with open(path, newline='') as f:
+                reader = csv.reader(f)
+                for row in reader:
+                    print(row)
+
+        elif file_type == "json":
+            with open(path, "r") as f:
+                data = json.load(f)
+                print(json.dumps(data, indent=2))
+
+        else:
+            print("Unsupported file type.")
+
+    except Exception as e:
+        print("Error:", e)
+
+def main():
+    parser = argparse.ArgumentParser(description="File Parser CLI")
+    parser.add_argument("filepath", help="Path to file")
+    parser.add_argument("--type", default="text", choices=["text", "lines", "csv", "json"])
+    args = parser.parse_args()
+    parse_file(args.filepath, args.type)
+
+if __name__ == "__main__":
+    main()
+

1_Assignment_Python_Fundamentals/student.py

+class Student:
+    def __init__(self, roll_no, name, age):
+        self.roll_no = roll_no
+        self.name = name
+        self.age = age
+
+    def display(self):
+        print(f"Roll No: {self.roll_no}, Name: {self.name}, Age: {self.age}")
+
+students = []
+
+def add_student():
+    roll_no = input("Enter roll number: ")
+    name = input("Enter name: ")
+    age = input("Enter age: ")
+    student = Student(roll_no, name, age)
+    students.append(student)
+    print("Student added successfully!")
+
+def view_students():
+    if not students:
+        print("No students to display.")
+    else:
+        print("Student List:")
+        for s in students:
+            s.display()
+
+def search_student():
+    roll_no = input("Enter roll number to search: ")
+    found = False
+    for s in students:
+        if s.roll_no == roll_no:
+            print("Student found:")
+            s.display()
+            found = True
+            break
+    if not found:
+        print("Student not found.")
+
+def delete_student():
+    roll_no = input("Enter roll number to delete: ")
+    for s in students:
+        if s.roll_no == roll_no:
+            students.remove(s)
+            print("Student deleted.")
+            return
+    print("Student not found.")
+
+def main():
+    while True:
+        print("\n=== Student Management System ===")
+        print("1. Add Student")
+        print("2. View All Students")
+        print("3. Search Student")
+        print("4. Delete Student")
+        print("5. Exit")
+
+        choice = input("Enter your choice (1-5): ")
+
+        if choice == "1":
+            add_student()
+        elif choice == "2":
+            view_students()
+        elif choice == "3":
+            search_student()
+        elif choice == "4":
+            delete_student()
+        elif choice == "5":
+            break
+        else:
+            print("Invalid choice.try again")
+
+main()
+