!pip install -q qrcode[pil]

from PIL import Image
import qrcode
from IPython.display import display, HTML
import io, base64

data = input("請輸入要產生 QR Code 的網址或文字： ").strip()
if not data:
    data = "https://www.example.com"

qr = qrcode.QRCode(version=None, error_correction=qrcode.constants.ERROR_CORRECT_M,
                   box_size=10, border=4)
qr.add_data(data); qr.make(fit=True)
img = qr.make_image(fill_color="black", back_color="white").convert("RGB")

out_path = "/content/qrcode.png"
img.save(out_path)
display(img)

# 下載連結（通用做法）
buffer = io.BytesIO()
img.save(buffer, format="PNG")
b64 = base64.b64encode(buffer.getvalue()).decode()
display(HTML(f'<a download="qrcode.png" href="data:image/png;base64,{b64}">按此下載 QR Code 圖片</a>'))