Packages and Import Statements

A package is a way of organizing related modules together inside a directory, and the import statement is how you bring the code from a module or package into your current script so you can use it.

Basic Import Syntax

import math
print(math.pi)          # access via the module name

from math import pi
print(pi)                # import a specific name directly

from math import pi as PI
print(PI)                 # import with an alias

import math as m
print(m.pi)                # alias the whole module

What Is a Package?

A package is simply a directory containing multiple related module files, along with a special __init__.py file that tells Python to treat that directory as a package. This lets large projects organize hundreds of files logically instead of dumping everything into one folder.

my_project/
    __init__.py
    data_cleaning.py
    visualization.py
    models.py

from my_project import data_cleaning
data_cleaning.clean(data)

Coming Up Next

Next, you'll learn about the reload function - useful when you need Python to re-read a module that has changed during an active session.