modules in python

 Modules are pre-written pieces of code that can be imported and used in other Python programs. Python has a vast collection of modules that can be used for different purposes such as data analysis, web development, machine learning, scientific computing, and more.

To use a module in Python, you first need to import it into your program using the import keyword. For example, if you want to use the math module to perform mathematical operations, you can import it like this:

python
import math

Once the module is imported, you can use its functions and variables by referring to them using the dot notation. For example, to use the sqrt() function from the math module to calculate the square root of a number, you can write:

lua
import math 
x = 16 
y = math.sqrt(x) 
print(y) 
# Output: 4.0

Python also allows you to import specific functions or variables from a module using the from keyword. For example, to import only the sqrt() function from the math module, you can write:

python
from math import sqrt 
x = 16 
y = sqrt(x) 
print(y) # Output: 4.0

You can also give an alias to a module or a specific function/variable using the as keyword. For example:

python
import math as m 
x = 16 
y = m.sqrt(x) 
print(y) # Output: 4.0

These are just a few examples of how to use modules in Python. There are many other built-in and third-party modules available in Python that can be used for various purposes.