python中生成二维码图片

返回string流然后返回图片HttpResponse(image_stream, content_type=”image/png”)
这样就可以在html中显示了

def generate_qrcode(url, invitation_code):
    try:
        qr = qrcode.QRCode(
            version=1,
            error_correction=qrcode.constants.ERROR_CORRECT_L,
            box_size=10,
            border=4,
        )
        data = str(url) + str(invitation_code)
        qr.add_data(data)
        qr.make(fit=True)
        im = qr.make_image()
        buf = StringIO()
        im.save(buf)
        image_stream = buf.getvalue()
    except Exception as e:
        print e
    return image_stream