# Python QRCode Module

The `qrcode` library allows you to generate QR codes in Python. It uses the Python Imaging Library (PIL) to create images.

## Installation

```bash
pip install "qrcode[pil]"
```

## Basic Usage

The simplest way to create a QR code is using the `make` shortcut function.

```python
import qrcode

img = qrcode.make('Some data here')
img.save("some_file.png")
```

## Advanced Usage

For more control, use the `QRCode` class.

```python
import qrcode

qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_L,
    box_size=10,
    border=4,
)

qr.add_data('Some data')
qr.make(fit=True)

img = qr.make_image(fill_color="black", back_color="white")
img.save("advanced_qr.png")
```

### Parameters

*   **version**: An integer from 1 to 40 that controls the size of the QR Code (smallest, version 1, is a 21x21 matrix). Set to `None` and use `fit=True` to determine this automatically.
*   **error_correction**: Controls the error correction used for the QR Code.
    *   `ERROR_CORRECT_L`: About 7% or less errors can be corrected.
    *   `ERROR_CORRECT_M`: About 15% or less errors can be corrected (default).
    *   `ERROR_CORRECT_Q`: About 25% or less errors can be corrected.
    *   `ERROR_CORRECT_H`: About 30% or less errors can be corrected.
*   **box_size**: How many pixels each "box" of the QR code is.
*   **border**: How many boxes thick the border should be (default is 4, which is the minimum according to the specs).

## Creating SVG

You can also create SVG images.

```python
import qrcode
import qrcode.image.svg

factory = qrcode.image.svg.SvgImage
img = qrcode.make('Some data here', image_factory=factory)
img.save("qr.svg")
```

[[programming/python/python]]