Author

Tony D

Published

March 16, 2025

A guide to generating QR codes in R and Python.

This document demonstrates how to generate QR codes using both R and Python. It provides code examples for creating QR codes from a given string, saving them as SVG or PNG files, and displaying them. The R section uses the qrcode package, while the Python section uses the qrcode and scikit-image libraries.

R

Code

pak::pkg_install('qrcode')

Code

library(reticulate)
use_python("/Library/Frameworks/Python.framework/Versions/3.13/bin/python3.13")
py_require(c('qrcode','Pillow','numpy','scikit-image'))

Code

library(qrcode)
code=qr_code("https://rfor.us/posit2024slides")

Save the QR code as a SVG file

Code

generate_svg(code, filename = "qr.svg")

Code

plot(code)

Python

Code

!pip install qrcode scikit-image

Code

import platform
print(platform.python_version())

3.13.2

Code

import qrcode
img = qrcode.make("https://rfor.us/posit2024slides")
type(img)  # qrcode.image.pil.PilImage

<class 'qrcode.image.pil.PilImage'>

save the QR code as a PNG file

Code

img.save("some_file.png")

Code

from skimage import io
img = io.imread("some_file.png")
io.imshow(img)

---
title: "Make QR code"
author: "Tony D"
date: "2025-03-16"
categories: 
  - Tool
  - R
  - Python
  
image: "some_file.png"
---

A guide to generating QR codes in R and Python.

This document demonstrates how to generate QR codes using both R and Python. It provides code examples for creating QR codes from a given string, saving them as SVG or PNG files, and displaying them. The R section uses the `qrcode` package, while the Python section uses the `qrcode` and `scikit-image` libraries.




# R

```{r}
#| eval: false
pak::pkg_install('qrcode')
```

```{r}
library(reticulate)
use_python("/Library/Frameworks/Python.framework/Versions/3.13/bin/python3.13")
py_require(c('qrcode','Pillow','numpy','scikit-image'))
```


```{r}
library(qrcode)
code=qr_code("https://rfor.us/posit2024slides") 
```


Save the QR code as a SVG file

```{r}
generate_svg(code, filename = "qr.svg")
```


```{r}
plot(code)
```





# Python

```{python}
#| eval: false
!pip install qrcode scikit-image
```

```{python}
import platform
print(platform.python_version())
```



```{python}
import qrcode
img = qrcode.make("https://rfor.us/posit2024slides")
type(img)  # qrcode.image.pil.PilImage
```

save the QR code as a PNG file

```{python}
img.save("some_file.png")
```

```{python}
from skimage import io
img = io.imread("some_file.png")
io.imshow(img)
```