> ## Documentation Index
> Fetch the complete documentation index at: https://ai.tharung.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Python Packages

# 6. What is a Package?

A **package** is a folder that contains multiple related modules.

Example structure:

```text theme={null}
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:

```text theme={null}
mypackage/
    __init__.py
    utils.py
```

***

### utils.py

```python theme={null}
def greet(name):
    return f"Hello {name}"
```

***

### **init**.py

```python theme={null}
from .utils import greet
```

***

### main.py

```python theme={null}
from mypackage import greet

print(greet("John"))
```

**Output**

```text theme={null}
Hello John
```

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

```python theme={null}
from mypackage.utils import greet
```

***

# 8. Importing Modules from a Package

Folder structure:

```text theme={null}
project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── calculator.py
```

***

### calculator.py

```python theme={null}
def add(a, b):
    return a + b
```

***

### main.py

```python theme={null}
from mypackage.calculator import add

print(add(10, 20))
```

**Output**

```text theme={null}
30
```

***

# 6. What is a Package?

A **package** is a folder that contains multiple related modules.

Example structure:

```text theme={null}
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:

```text theme={null}
mypackage/
    __init__.py
    utils.py
```

***

### utils.py

```python theme={null}
def greet(name):
    return f"Hello {name}"
```

***

### **init**.py

```python theme={null}
from .utils import greet
```

***

### main.py

```python theme={null}
from mypackage import greet

print(greet("John"))
```

**Output**

```text theme={null}
Hello John
```

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

```python theme={null}
from mypackage.utils import greet
```

***

# 8. Importing Modules from a Package

Folder structure:

```text theme={null}
project/
│
├── main.py
│
└── mypackage/
    ├── __init__.py
    ├── calculator.py
```

***

### calculator.py

```python theme={null}
def add(a, b):
    return a + b
```

***

### main.py

```python theme={null}
from mypackage.calculator import add

print(add(10, 20))
```

**Output**

```text theme={null}
30
```

***