我见过的一种方法是将可变对象（例如列表或字典）与索引或某种其他标识符一起传递给线程的构造函数。然后，线程可以将其结果存储在该对象的专用插槽中。例如：
def foo(bar, result, index): print 'hello {0}'.format(bar) result[index] = "foo"from threading import Threadthreads = [None] * 10results = [None] * 10for i in range(len(threads)): threads[i] = Thread(target=foo, args=('world!', results, i)) threads[i].start()# do some other stufffor i in range(len(threads)): threads[i].join()print " ".join(results) # what sound does a metasyntactic locomotive make?如果你确实想join()返回被调用函数的返回值，则可以使用如下所示的Thread子类来实现：
from threading import Threaddef foo(bar): print 'hello {0}'.format(bar) return "foo"class ThreadWithReturnValue(Thread): def __init__(self, group=None, target=None, name=None, args=(), kwargs={}, Verbose=None): Thread.__init__(self, group, target, name, args, kwargs, Verbose) self._return = None def run(self): if self._Thread__target is not None: self._return = self._Thread__target(*self._Thread__args, **self._Thread__kwargs) def join(self): Thread.join(self) return self._returntwrv = ThreadWithReturnValue(target=foo, args=('world!',))twrv.start()print twrv.join() # prints foo由于名称修改，这有点麻烦，并且它访问特定于Thread实现的“私有”数据结构…但是它可以工作。
对于python3
class ThreadWithReturnValue(Thread): def __init__(self, group=None, target=None, name=None, args=(), kwargs={}, Verbose=None): Thread.__init__(self, group, target, name, args, kwargs) self._return = None def run(self): print(type(self._target)) if self._target is not None: self._return = self._target(*self._args, **self._kwargs) def join(self, *args): Thread.join(self, *args) return self._return
