Python线程捕获异常并退出

Question

我是Python开发的新手，正在尝试弄清楚如何在线程中捕获ConnectionError，然后退出。 目前，我拥有它，因此它可以捕获一般的异常，但是我想为不同的异常指定不同的异常处理，并在某些类型的异常上停止应用程序。

我当前正在使用线程，但是我开始怀疑是否应该使用多线程？

这是代码的副本：

import threading
import sys
from integration import rabbitMq
from integration import bigchain


def do_something_with_exception():
    exc_type, exc_value = sys.exc_info()[:2]
    print('Handling %s exception with message "%s" in %s' % \
          (exc_type.__name__, exc_value, threading.current_thread().name))


class ConsumerThread(threading.Thread):
    def __init__(self, queue, *args, **kwargs):
        super(ConsumerThread, self).__init__(*args, **kwargs)

        self._queue = queue

    def run(self):
        bigchaindb = bigchain.BigChain()
        bdb = bigchaindb.connect('localhost', 3277)
        keys = bigchaindb.loadkeys()

        rabbit = rabbitMq.RabbitMq(self._queue, bdb, keys)
        channel = rabbit.connect()

        while True:
            try:
                rabbit.consume(channel)
                # raise RuntimeError('This is the error message')
            except:
                do_something_with_exception()
                break

if __name__ == "__main__":
    threads = [ConsumerThread("sms"), ConsumerThread("contract")]
    for thread in threads:
        thread.daemon = True
        thread.start()
    for thread in threads:
        thread.join()

    exit(1)

Answer 1

Python具有内置的Exception 。 阅读每个异常描述，以了解您要提出哪种特定类型的异常。

例如：

raise ValueError('A very specific thing you don't want happened')

像这样使用它：

try:
    #some code that may raise ValueError
except ValueError as err:
    print(err.args)

以下是Python异常层次结构的列表：

 BaseException
... Exception
...... StandardError
......... TypeError
......... ImportError
............ ZipImportError
......... EnvironmentError
............ IOError
............... ItimerError
............ OSError
......... EOFError
......... RuntimeError
............ NotImplementedError
......... NameError
............ UnboundLocalError
......... AttributeError
......... SyntaxError
............ IndentationError
............... TabError
......... LookupError
............ IndexError
............ KeyError
............ CodecRegistryError
......... ValueError
............ UnicodeError
............... UnicodeEncodeError
............... UnicodeDecodeError
............... UnicodeTranslateError
......... AssertionError
......... ArithmeticError
............ FloatingPointError
............ OverflowError
............ ZeroDivisionError
......... SystemError
............ CodecRegistryError
......... ReferenceError
......... MemoryError
......... BufferError
...... StopIteration
...... Warning
......... UserWarning
......... DeprecationWarning
......... PendingDeprecationWarning
......... SyntaxWarning
......... RuntimeWarning
......... FutureWarning
......... ImportWarning
......... UnicodeWarning
......... BytesWarning
...... _OptionError
... GeneratorExit
... SystemExit
... KeyboardInterrupt

注意：SystemExit是一种特殊的异常类型。 当引发Python解释器退出时； 不打印堆栈回溯。 如果您未指定例外状态，它将返回0。