Importing Modules
Standard Library
The Standard Library is a collection of modules that come pre-installed with Python.
Importing a whole module
You can import an entire module to access its functions, classes, and variables.
Example:
import math
print(math.sqrt(16)) # Outputs: 4.0
Importing specific functions or classes from a module
This allows you to import only the functions or classes you need, making your code cleaner and more efficient.
from math import sqrt
print(sqrt(16)) # Outputs: 4.0
Third-party Libraries
Third-party libraries are additional modules that are not included in the Python standard library but can be installed via pip.
Importing a third-party library
import requests
response = requests.get('https://api.example.com')
print(response.status_code)
Aliases
You can assign an alias to a module or function to simplify its usage, especially if the names are long.
Using an alias for a module
import numpy as np
arr = np.array([1, 2, 3])
print(arr)
Using an alias for a function
from math import sqrt as square_root
print(square_root(16))
Last modified: 17 March 2025