age = 15
assert age >= 18, "User must be at least 18 years old"

class FileMissingError(Exception):
    pass

def load_config(filename):
    if not filename.endswith(".json"):
        raise FileMissingError("Only JSON configuration files supported")

load_config("config.txt")

try:
    num = int("10")
except ValueError:
    print("Conversion failed")
else:
    print("Conversion successful:", num)

Conversion successful: 10

try:
    file = open("data.txt", "r")
except FileNotFoundError:
    print("File not found")
finally:
    print("Execution completed")

File not found
Execution completed

counter = 0

def increment():
    global counter
    counter += 1

increment()
print(counter)  

import math

help(math)

Help on built-in module math:

NAME
    math

DESCRIPTION
    This module provides access to the mathematical functions
    defined by the C standard.

FUNCTIONS
    acos(x, /)
        Return the arc cosine (measured in radians) of x.

        The result is between 0 and pi.

    acosh(x, /)
        Return the inverse …

def main():
    print("Main function executed")

if __name__ == "__main__":
    main()

Main function executed

from my_package import greet

print(greet())

# my_package/__init__.py
from .module1 import greet

import sys

def main():
    print("Arguments received:", sys.argv)

if __name__ == "__main__":
    main()

Arguments received: ['C:\\Users\\Ashwin\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\ipykernel_launcher.py', '-f', 'C:\\Users\\Ashwin\\AppData\\Roaming\\jupyter\\runtime\\kernel-381afcb6-19e6-489b-be48-09b4fef13007.json']

# file: demo.py
def main():
    print("Main function executed")

if __name__ == "__main__":
    main()

Main function executed