Modules in Python:

he development of large and complex applications/programs often involves breaking them down into smaller modules, which can then be combined to form the larger program.

There are two types of modules in Python:

1. Built-in modules

2. Modules that can be created by us or by other programmers.

To create a module, we simply need to create a ".py" file and write a Python function in it.

For example, we can create a module called greet with a hello function inside it.

We can create a new file called "greet.py" and add the following code to it:

def hello():
    print('Welcome to the club')

We can then use the module in our "demo.py" file:

import greet

greet.hello()

The module can have multiple functions, not just "greet". For example, we can add another function called "bye":

def hello():
    print('Welcome to the club')

def bye():
    print('Goodbye, thanks for visiting')

We can also import specific functions from a module using the "from" keyword:

from greet import hello, bye

hello()
bye()

Using built-in Python modules:

Let's use a built-in module called random.

In the random module, we have multiple functions used for different purposes.

Let's use the randint function, which generates random numbers between the given range:

import random

result = random.randint(1,10)
print(result)

We could also import it this way:

from random import randint

result = randint(1,10)
print(result)

Let's use another module called the datetime module.

The datetime module allows us to perform multiple operations with respect to date and time.

Let's use the datetime module to get the current date and time:

import datetime

today_date = datetime.date.today()
current_time = datetime.datetime.now()
print(today_date)
print(current_time)
# but a better way to write the above code is
from datetime import date, datetime

today_date = date.today()
current_time = datetime.now()
print(today_date)
print(current_time)