What is the difference between a module and a package?

Question

Accepted Answer

**Module** is a single Python file (`.py`). **Package** is a collection of modules in a directory with `__init__.py`.

**Module:**
```
utils.py  # Single file — module
```

```python
# Import module
import utils
from utils import helper
```

**Package:**
```
mypackage/
  __init__.py
  utils.py
  helpers.py
  models/
    __init__.py
    user.py
```

```python
# Import from package
from mypackage.utils import helper
from mypackage.models import user
```

**`__init__.py`** can be:
- Empty (marks directory as package).
- With initialization code.
- With exports (`from .module import *`).

Python: What is the difference between a module and a package?