- [How to Generate and Read QR Code in Python](https://www.thepythoncode.com/article/generate-read-qr-code-python). ([code](general/generating-reading-qrcode))

- ### [Web Scraping](https://www.thepythoncode.com/topic/web-scraping)

To run this:

- `pip3 install -r requirements.txt`

- If you want to generate a QR code, run `generate_qrcode.py`.

For instance, if you want to generate a QR code that contains the data: "https://www.thepythoncode.com" to a file named `site.png`, you can:

```

import qrcode

import sys

data = sys.argv[1]

filename = sys.argv[2]

img = qrcode.make(data)

img.save(filename)

import cv2

import sys

filename = sys.argv[1]

img = cv2.imread(filename)

detector = cv2.QRCodeDetector()

data, bbox, straight_qrcode = detector.detectAndDecode(img)

if bbox is not None:

print(f"QRCode data:\n{data}")

# display the image with lines

# length of bounding box

n_lines = len(bbox)

for i in range(n_lines):

# draw all lines

point1 = tuple(bbox[i][0])

point2 = tuple(bbox[(i+1) % n_lines][0])

cv2.line(img, point1, point2, color=(255, 0, 0), thickness=2)

cv2.imshow("img", img)

cv2.waitKey(0)

cv2.destroyAllWindows()

import cv2

cap = cv2.VideoCapture(0)

detector = cv2.QRCodeDetector()

while True:

_, img = cap.read()

# detect and decode

data, bbox, _ = detector.detectAndDecode(img)

# check if there is a QRCode in the image

if bbox is not None:

# display the image with lines

for i in range(len(bbox)):

# draw all lines

cv2.line(img, tuple(bbox[i][0]), tuple(bbox[(i+1) % len(bbox)][0]), color=(255, 0, 0), thickness=2)

if data:

print("[+] QR Code detected, data:", data)

# display the result

cv2.imshow("img", img)

if cv2.waitKey(1) == ord("q"):

break

cap.release()

cv2.destroyAllWindows()

face_cascade = cv2.CascadeClassifier("C:/Users/STRIX/Desktop/vscodes/repos/pythoncode-tutorials/machine-learning/face_detection/cascades/haarcascade_fontalface_default.xml")