class Animal:
    def eat(self):
        print("Animal is eating")

class Dog(Animal):
    pass

d = Dog()
d.eat()  # Inherited method

Animal is eating

class Father:
    def skill1(self):
        print("Driving")

class Mother:
    def skill2(self):
        print("Cooking")

class Child(Father, Mother):
    pass

c = Child()
c.skill1()
c.skill2()

Driving
Cooking

class Number:
    def __init__(self, value):
        self.value = value

    def __add__(self, other):
        return self.value + other.value

n1 = Number(10)
n2 = Number(20)

print(n1 + n2)  # Output: 30

30

print(len("Python"))   # String length
print(len([1, 2, 3]))  # List length

6
3

print(__name__)

__main__

class InvalidInputError(Exception):
    pass

import pandas as pd

data = {
    "name": ["Alice", "Bob"],
    "age": [25, 30],
    "city": ["Paris", "London"]
}

df = pd.DataFrame(data)
df.to_csv("data.csv", index=False)

import csv

with open("data_pipe.csv", "w", newline="") as file:
    writer = csv.writer(file, delimiter="|")
    writer.writerow(["Name", "Age", "Country"])
    writer.writerow(["John", 35, "India"])

import csv

with open("quotes.csv", "w", newline="") as file:
    writer = csv.writer(file, quoting=csv.QUOTE_ALL)
    writer.writerow(["Alice", "Software Engineer", "New York"])

import csv

with open("unicode.csv", "w", encoding="utf-8", newline="") as file:
    writer = csv.writer(file)
    writer.writerow(["Name", "City"])
    writer.writerow(["José", "München"])