6. What is a Package?

A package is a folder that contains multiple related modules. Example structure:

project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── utils.py
    └── calculator.py

Packages help organize larger Python projects.

7. What is `init.py`?

__init__.py is a special file inside a package. It tells Python that the directory should be treated as a package (especially in older Python versions) and can also run initialization code or expose selected functions. Example:

mypackage/
    __init__.py
    utils.py

utils.py

def greet(name):
    return f"Hello {name}"

init.py

from .utils import greet

main.py

from mypackage import greet

print(greet("John"))

Output

Hello John

Without importing greet in __init__.py, you would write:

from mypackage.utils import greet

8. Importing Modules from a Package

Folder structure:

project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── calculator.py

calculator.py

def add(a, b):
    return a + b

main.py

from mypackage.calculator import add

print(add(10, 20))

Output

6. What is a Package?

A package is a folder that contains multiple related modules. Example structure:

project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── utils.py
    └── calculator.py

Packages help organize larger Python projects.

7. What is `init.py`?

mypackage/
    __init__.py
    utils.py

utils.py

def greet(name):
    return f"Hello {name}"

init.py

from .utils import greet

main.py

from mypackage import greet

print(greet("John"))

Output

Hello John

Without importing greet in __init__.py, you would write:

from mypackage.utils import greet

8. Importing Modules from a Package

Folder structure:

project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── calculator.py

calculator.py

def add(a, b):
    return a + b

main.py

from mypackage.calculator import add

print(add(10, 20))

Output

Day 1

Day 2

Day 3

Python Packages

6. What is a Package?

7. What is `init.py`?

utils.py

init.py

main.py

8. Importing Modules from a Package

calculator.py

main.py

6. What is a Package?

7. What is `init.py`?

utils.py

init.py

main.py

8. Importing Modules from a Package

calculator.py

main.py

​6. What is a Package?

​7. What is __init__.py?

​utils.py

​init.py

​main.py

​8. Importing Modules from a Package

​calculator.py

​main.py

​6. What is a Package?

​7. What is __init__.py?

​utils.py

​init.py

​main.py

​8. Importing Modules from a Package

​calculator.py

​main.py

6. What is a Package?

7. What is `init.py`?

utils.py

init.py

main.py

8. Importing Modules from a Package

calculator.py

main.py

6. What is a Package?

7. What is `init.py`?

utils.py

init.py

main.py

8. Importing Modules from a Package

calculator.py

main.py