如何在異常后繼續循環？

Question

我有一個代碼，其中我循環通過主機列表並附加到連接列表的連接，如果有連接錯誤，我想跳過它並繼續主機列表中的下一個主機。

繼承人我現在擁有的：

def do_connect(self):
    """Connect to all hosts in the hosts list"""
    for host in self.hosts:
        try:
            client = paramiko.SSHClient()
            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            client.connect(host['ip'], port=int(host['port']), username=host['user'], timeout=2)
        except:
            pass
            #client.connect(host['ip'], port=int(host['port']), username=host['user'], password=host['passwd'])

        finally:
            if paramiko.SSHException():
                pass
            else:
                self.connections.append(client)

這不能正常工作，如果連接失敗，它只會一次又一次地循環同一個主機，直到它建立連接，我該如何解決這個問題？

Answer 1

你自己的答案在很多方面仍然是錯誤的......

import logging
logger = logging.getLogger(__name__)

def do_connect(self):
    """Connect to all hosts in the hosts list"""
    for host in self.hosts:
        # this one has to go outside the try/except block
        # else `client` might not be defined.
        client = paramiko.SSHClient()
        try:
            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            client.connect(host['ip'], port=int(host['port']), username=host['user'], timeout=2)

        # you only want to catch specific exceptions here
        except paramiko.SSHException as e:
            # this will log the full error message and traceback
            logger.exception("failed to connect to %(ip)s:%(port)s (user %(user)s)", host) 

            continue
        # here you want a `else` clause not a `finally`
        # (`finally` is _always_ executed)
        else:
            self.connections.append(client)

Answer 2

好吧，讓它工作，我需要添加繼續，馬克和前面提到的如果檢查里面最終總是返回真，所以這是固定的。

這是固定代碼，它不會添加失敗的連接，並在此之后正常繼續循環：

def do_connect(self):
    """Connect to all hosts in the hosts list"""
    for host in self.hosts:
        try:
            client = paramiko.SSHClient()
            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            client.connect(host['ip'], port=int(host['port']), username=host['user'], timeout=2)
        except:
            continue
            #client.connect(host['ip'], port=int(host['port']), username=host['user'], password=host['passwd'])

        finally:
            if client._agent is None:
                pass
            else:
                self.connections.append(client)