虽然不可能直接捕获在不同线程中抛出的异常，但下面的代码可以相当透明地获取与此功能非常接近的内容。子线程必须继承ExThread类而不是线程。线程和父线程在等待线程完成任务时必须调用child_thread.join_with_exception()方法，而不是child_thread.join()方法。

此实现的技术细节:当子线程抛出异常时，它将通过Queue传递给父线程，并在父线程中再次抛出。注意，在这种方法中没有忙碌等待。

#!/usr/bin/env python

import sys
import threading
import Queue

class ExThread(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        self.__status_queue = Queue.Queue()

    def run_with_exception(self):
        """This method should be overriden."""
        raise NotImplementedError

    def run(self):
        """This method should NOT be overriden."""
        try:
            self.run_with_exception()
        except BaseException:
            self.__status_queue.put(sys.exc_info())
        self.__status_queue.put(None)

    def wait_for_exc_info(self):
        return self.__status_queue.get()

    def join_with_exception(self):
        ex_info = self.wait_for_exc_info()
        if ex_info is None:
            return
        else:
            raise ex_info[1]

class MyException(Exception):
    pass

class MyThread(ExThread):
    def __init__(self):
        ExThread.__init__(self)

    def run_with_exception(self):
        thread_name = threading.current_thread().name
        raise MyException("An error in thread '{}'.".format(thread_name))

def main():
    t = MyThread()
    t.start()
    try:
        t.join_with_exception()
    except MyException as ex:
        thread_name = threading.current_thread().name
        print "Caught a MyException in thread '{}': {}".format(thread_name, ex)

if __name__ == '__main__':
    main()

我喜欢这门课:

https://gist.github.com/earonesty/b88d60cb256b71443e42c4f1d949163e

import threading
from typing import Any


class PropagatingThread(threading.Thread):
    """A Threading Class that raises errors it caught, and returns the return value of the target on join."""

    def __init__(self, *args, **kwargs):
        self._target = None
        self._args = ()
        self._kwargs = {}
        super().__init__(*args, **kwargs)
        self.exception = None
        self.return_value = None
        assert self._target

    def run(self):
        """Don't override this if you want the behavior of this class, use target instead."""
        try:
            if self._target:
                self.return_value = self._target(*self._args, **self._kwargs)
        except Exception as e:
            self.exception = e
        finally:
            # see super().run() for why this is necessary
            del self._target, self._args, self._kwargs

    def join(self, timeout=None) -> Any:
        super().join(timeout)
        if self.exception:
            raise self.exception
        return self.return_value

类似于RickardSjogren的方法，没有Queue, sys等，但也没有一些信号监听器:直接执行一个异常处理程序，对应于一个异常块。

#!/usr/bin/env python3

import threading

class ExceptionThread(threading.Thread):

    def __init__(self, callback=None, *args, **kwargs):
        """
        Redirect exceptions of thread to an exception handler.

        :param callback: function to handle occured exception
        :type callback: function(thread, exception)
        :param args: arguments for threading.Thread()
        :type args: tuple
        :param kwargs: keyword arguments for threading.Thread()
        :type kwargs: dict
        """
        self._callback = callback
        super().__init__(*args, **kwargs)

    def run(self):
        try:
            if self._target:
                self._target(*self._args, **self._kwargs)
        except BaseException as e:
            if self._callback is None:
                raise e
            else:
                self._callback(self, e)
        finally:
            # Avoid a refcycle if the thread is running a function with
            # an argument that has a member that points to the thread.
            del self._target, self._args, self._kwargs, self._callback

只有自我。_callback和run()中的except块是普通threading.Thread之外的。

使用异常存储包装线程。

import threading
import sys
class ExcThread(threading.Thread):

    def __init__(self, target, args = None):
        self.args = args if args else []
        self.target = target
        self.exc = None
        threading.Thread.__init__(self)

    def run(self):
        try:
            self.target(*self.args)
            raise Exception('An error occured here.')
        except Exception:
            self.exc=sys.exc_info()

def main():
    def hello(name):
        print(!"Hello, {name}!")
    thread_obj = ExcThread(target=hello, args=("Jack"))
    thread_obj.start()

    thread_obj.join()
    exc = thread_obj.exc
    if exc:
        exc_type, exc_obj, exc_trace = exc
        print(exc_type, ':',exc_obj, ":", exc_trace)

main()

作为线程的新手，我花了很长时间来理解如何实现Mateusz Kobos的代码(如上)。这里有一个明确的版本，以帮助您了解如何使用它。

#!/usr/bin/env python

import sys
import threading
import Queue

class ExThread(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        self.__status_queue = Queue.Queue()

    def run_with_exception(self):
        """This method should be overriden."""
        raise NotImplementedError

    def run(self):
        """This method should NOT be overriden."""
        try:
            self.run_with_exception()
        except Exception:
            self.__status_queue.put(sys.exc_info())
        self.__status_queue.put(None)

    def wait_for_exc_info(self):
        return self.__status_queue.get()

    def join_with_exception(self):
        ex_info = self.wait_for_exc_info()
        if ex_info is None:
            return
        else:
            raise ex_info[1]

class MyException(Exception):
    pass

class MyThread(ExThread):
    def __init__(self):
        ExThread.__init__(self)

    # This overrides the "run_with_exception" from class "ExThread"
    # Note, this is where the actual thread to be run lives. The thread
    # to be run could also call a method or be passed in as an object
    def run_with_exception(self):
        # Code will function until the int
        print "sleeping 5 seconds"
        import time
        for i in 1, 2, 3, 4, 5:
            print i
            time.sleep(1) 
        # Thread should break here
        int("str")
# I'm honestly not sure why these appear here? So, I removed them. 
# Perhaps Mateusz can clarify?        
#         thread_name = threading.current_thread().name
#         raise MyException("An error in thread '{}'.".format(thread_name))

if __name__ == '__main__':
    # The code lives in MyThread in this example. So creating the MyThread 
    # object set the code to be run (but does not start it yet)
    t = MyThread()
    # This actually starts the thread
    t.start()
    print
    print ("Notice 't.start()' is considered to have completed, although" 
           " the countdown continues in its new thread. So you code "
           "can tinue into new processing.")
    # Now that the thread is running, the join allows for monitoring of it
    try:
        t.join_with_exception()
    # should be able to be replace "Exception" with specific error (untested)
    except Exception, e: 
        print
        print "Exceptioon was caught and control passed back to the main thread"
        print "Do some handling here...or raise a custom exception "
        thread_name = threading.current_thread().name
        e = ("Caught a MyException in thread: '" + 
             str(thread_name) + 
             "' [" + str(e) + "]")
        raise Exception(e) # Or custom class of exception, such as MyException

捕获线程异常并与调用方方法通信的一个简单方法是将字典或列表传递给worker方法。

示例(将字典传递给工作方法):

import threading

def my_method(throw_me):
    raise Exception(throw_me)

def worker(shared_obj, *args, **kwargs):
    try:
        shared_obj['target'](*args, **kwargs)
    except Exception as err:
        shared_obj['err'] = err

shared_obj = {'err':'', 'target': my_method}
throw_me = "Test"

th = threading.Thread(target=worker, args=(shared_obj, throw_me), kwargs={})
th.start()
th.join()

if shared_obj['err']:
    print(">>%s" % shared_obj['err'])