from flask import Flask, request, send_file
import qrcode

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "<p>Hello, World!</p>"

@app.route('/qr_code', methods=['GET'])
def generate_qr_code():
    data = request.args.get('data')
    qr = qrcode.QRCode(version=1, error_correction=qrcode.constants.ERROR_CORRECT_L, box_size=10, border=4)
    qr.add_data(data)
    qr.make(fit=True)
    qr_img = qr.make_image(fill_color="black", back_color="white")
    qr_img.save('qr_code.png')
    return send_file('qr_code.png')


if __name__ == '__main__':
    app.run()