Python Mini Projects

# PROJECT 1: Simple Calculator
def calculator():
    print("=== Simple Calculator ===")
    a = float(input("Enter first number: "))
    op = input("Operator (+, -, *, /): ")
    b = float(input("Enter second number: "))
    ops = {
        "+": lambda a, b: a + b,
        "-": lambda a, b: a - b,
        "*": lambda a, b: a * b,
        "/": lambda a, b: a / b if b != 0 else "Error: Division by zero"
    }
    result = ops.get(op, lambda a, b: "Invalid operator")(a, b)
    print(f"Result: {result}")
# PROJECT 2: Student Grade Manager
class GradeManager:
    def __init__(self):
        self.students = {}
    def add_student(self, name, marks):
        self.students[name] = marks
    def get_average(self):
        if not self.students:
            return 0
        return sum(self.students.values()) / len(self.students)
    def get_topper(self):
        return max(self.students, key=self.students.get)
    def display_all(self):
        print("\n📊 Student Report")
        print("=" * 30)
        for name, marks in sorted(self.students.items(), key=lambda x: x[1], reverse=True):
            grade = "A+" if marks >= 90 else "A" if marks >= 75 else "B" if marks >= 60 else "C"
            print(f"{name}: {marks} marks (Grade {grade})")
        print(f"\nAverage: {self.get_average():.1f}")
        print(f"Topper: {self.get_topper()} 🏆")
gm = GradeManager()
gm.add_student("Rahul", 85)
gm.add_student("Priya", 92)
gm.add_student("Amit", 78)
gm.add_student("Sara", 95)
gm.display_all()
# PROJECT 3: Password Generator
import random
import string
def generate_password(length=12):
    chars = string.ascii_letters + string.digits + "!@#$%&*"
    password = [
        random.choice(string.ascii_uppercase),
        random.choice(string.ascii_lowercase),
        random.choice(string.digits),
        random.choice("!@#$%&*"),
    ]
    password += [random.choice(chars) for _ in range(length - 4)]
    random.shuffle(password)
    return "".join(password)
print(f"\n🔐 Generated Password: {generate_password()}")
print(f"🔐 Short Password: {generate_password(8)}")