python2 :: TypeError：+：＆＃39; NoneType＆＃39;不支持的操作数类型和＆＃39; str＆＃39;

Question

我开始尝试使用Python，但我无法理解代码的错误......我得到了： 我得到了第86行和第34行的错误，其中显示了TypeErroe：不支持的操作数类型+：＆＃39; NoneType＆＃39;和＆＃39; str＆＃39;

请帮我解决这个问题！

  

python code.py:

def build(string, path, name, logo=""):
    qr = qrcode.QRCode(
         version = 2,
         error_correction = qrcode.constants.ERROR_CORRECT_H,
         box_size = 10,
         border = 1
    )
    qr.add_data(string)
    qr.make( fit = True)
    img = qr.make_image()
    img = img.convert("RGBA")
    icon = Image.open(logo+'.png')
    img_w, img_h = img.size
    factor = 4
    size_w = int(img_w / factor)
    size_h = int(img_h / factor)
    icon_w, icon_h = icon.size
    if icon_w > size_w: icon_w = size_w
    if icon_h > size_h: icon_h = size_h
    icon = icon.resize((icon_w, icon_h), Image.ANTIALIAS)
    w = int((img_w - icon_w) / 2)
    h = int((img_h - icon_h) / 2)
    icon = icon.convert("RGBA")
    newimg = Image.new("RGBA", (icon_w + 8, icon_h + 8), (255, 255, 255))
    img.paste(newimg, (w-4, h-4), newimg)
    img.paste(icon, (w, h), icon)
    img.save(path + name + '.png', quality = 100)
    file = path + name + '.png'
    return file

if __name__ == "__main__":
    argparser = argparse.ArgumentParser()
    argparser.add_argument('Words')
    argparser.add_argument('-d', '--directory', default = os.getcwd())
    argparser.add_argument('-n', '--name')
    argparser.add_argument('-l', '--logo')
    args = argparser.parse_args()
    try:
        file = build(
            args.Words,
            args.directory,
            args.name,
            args.logo
        )
        print (str(file))
    except:
        raise

  

node code.js：

const child = require('child_process');
child.exec('python code.py http://xx.com/down?name=client&type=1&shopId=1001 -n service -l ./img/service -d ./', function (error, stdout, stderr) {
  if (error) {
    console.log(error.stack);
    console.log('Error code: '+error.code);
    return;
  }
  console.log(`stdout: ${stdout}`);
  console.log(`stderr: ${stderr}`);
});

Answer 1

您的徽标变量似乎是NULL（其中没有值无类型）。首先检查它是否仍为无类型。

if(logo !=None ): # or if logo is not None:
 image = logo + '.png'
else:
  #put what you want to do
icon = Image.open(image)