使用python析构函数销毁webdriver报错？

[郎总]

正在学习使用webdriver，自己做了个实验，代码如下，我的想法就是在A的实例销毁的时候将浏览器关闭，保持二者生命周期一致。但是运行结果却报错了，自己猜想，可能是浏览器打开关闭需要时间，而a销毁的很快，二者无法同步吗？这个问题有好的解决方案吗？

from selenium import webdriver
class A():
def __init__(self):
print("this a A consctructer")
self.a = webdriver.Chrome(executable_path="/Applications/chromedriver")
self.a.get(url='https://www.baidu.com')

def __del__(self):
print("this a A desctructer")
self.a.quit()

a = A()
--------------------------------------------------------------------------
运行结果
this a A consctructer
this a A desctructer
Exception ignored in: <bound method A.__del__ of <__main__.A object at 0x1041024a8>>
Traceback (most recent call last):
File "/Users/~/Desktop/ScrapyPic/test.py", line 11, in __del__
File "/Users/~/Library/Python/3.6/lib/python/site-packages/selenium/webdriver/chrome/webdriver.py", line 123, in quit
File "/Users/~/Library/Python/3.6/lib/python/site-packages/selenium/webdriver/common/service.py", line 149, in stop
File "/Users/~/Library/Python/3.6/lib/python/site-packages/selenium/webdriver/common/service.py", line 120, in send_remote_shutdown_command
ImportError: sys.meta_path is None, Python is likely shutting down

Process finished with exit code 0