python - 使用多线程时如何正确处理此错误

Question

我正在使用凝固汽油弹库通过 GNS3 连接到 Arista vEOS。我 故意输入错误的 IP 只是为了查看我的代码如何处理错误。但是尝试和异常(exception)没有按预期工作。

import napalm
import concurrent.futures

def napalm_library(ip):
    driver = napalm.get_network_driver(ip[3])
    optional = {"transport": "telnet"}

    with driver(hostname=ip[0], username=ip[1], password=ip[2], optional_args=optional) as device:
         device.load_merge_candidate("test.txt")
         device.commit_config()

with concurrent.futures.ThreadPoolExecutor() as executor:
    t = executor.submit(napalm_library, ['1.1.1.1','username','pass','ios'])
    try:
        t.result()
    except TimeoutError as err1:
        print(err1)

相反，它给了我这个 TimeoutError，即使我已经尝试捕捉 TimeoutError。

[WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
Traceback (most recent call last):
  File "C:\Python38-32\lib\site-packages\pyeapi\eapilib.py", line 436, in send
    self.transport.endheaders(message_body=data)
  File "C:\Python38-32\lib\http\client.py", line 1225, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "C:\Python38-32\lib\http\client.py", line 1004, in _send_output
    self.send(msg)
  File "C:\Python38-32\lib\http\client.py", line 944, in send
    self.connect()
  File "C:\Python38-32\lib\http\client.py", line 1392, in connect
    super().connect()
  File "C:\Python38-32\lib\http\client.py", line 915, in connect
    self.sock = self._create_connection(
  File "C:\Python38-32\lib\socket.py", line 808, in create_connection
    raise err
  File "C:\Python38-32\lib\socket.py", line 796, in create_connection
    sock.connect(sa)
TimeoutError: [WinError 10060] A connection attempt failed because the connected party did not properly r

启发我，我应该如何处理错误。

Answer 1

当您检索线程结果时，您应该捕获错误，如下所示:

from concurrent.futures import ThreadPoolExecutor


with ThreadPoolExecutor() as executor:
    t = executor.submit(napalm_library, ip_addresses)

    try:
        t.result()
    except TimeoutError as err:
        print(err)