Python 2.7 在PyCharm中使用nosetests，并排安装python2和python3

我试图在PyCharm（2.7.3）中将NoTest与Python2和Python3并排使用

在Python2.7下，一切正常，但Python3.4中的任何测试都会失败，并出现以下错误：

Traceback (most recent call last):
  File "/home/robert/Programme/pycharm-2.7.3/helpers/pycharm/noserunner.py", line 91, in <module>
    process_args()
  File "/home/robert/Programme/pycharm-2.7.3/helpers/pycharm/noserunner.py", line 88, in process_args
    TestProgram(argv=argv, config=config)
  File "/usr/local/lib/python3.4/dist-packages/nose/core.py", line 121, in __init__
    **extra_args)
  File "/usr/lib/python3.4/unittest/main.py", line 93, in __init__
    self.runTests()
  File "/usr/local/lib/python3.4/dist-packages/nose/core.py", line 207, in runTests
    result = self.testRunner.run(self.test)
  File "/usr/local/lib/python3.4/dist-packages/nose/core.py", line 62, in run
    test(result)
  File "/usr/local/lib/python3.4/dist-packages/nose/suite.py", line 177, in __call__
    return self.run(*arg, **kw)
  File "/usr/local/lib/python3.4/dist-packages/nose/suite.py", line 224, in run
    test(orig)
  File "/usr/local/lib/python3.4/dist-packages/nose/suite.py", line 177, in __call__
    return self.run(*arg, **kw)
  File "/usr/local/lib/python3.4/dist-packages/nose/suite.py", line 224, in run
    test(orig)
  File "/usr/local/lib/python3.4/dist-packages/nose/case.py", line 46, in __call__
    return self.run(*arg, **kwarg)
  File "/usr/local/lib/python3.4/dist-packages/nose/case.py", line 139, in run
    result.addError(self, err)
  File "/usr/local/lib/python3.4/dist-packages/nose/proxy.py", line 131, in addError
    plugins.addError(self.test, err)
  File "/usr/local/lib/python3.4/dist-packages/nose/plugins/manager.py", line 99, in __call__
    return self.call(*arg, **kw)
  File "/usr/local/lib/python3.4/dist-packages/nose/plugins/manager.py", line 167, in simple
    result = meth(*arg, **kw)
  File "/home/robert/Programme/pycharm-2.7.3/helpers/pycharm/nose_utils.py", line 51, in addError
    err = self.formatErr(err)
  File "/home/robert/Programme/pycharm-2.7.3/helpers/pycharm/nose_utils.py", line 58, in formatErr
    return ''.join(traceback.format_exception(exctype, value, tb))
  File "/usr/lib/python3.4/traceback.py", line 181, in format_exception
    return list(_format_exception_iter(etype, value, tb, limit, chain))
  File "/usr/lib/python3.4/traceback.py", line 146, in _format_exception_iter
    for value, tb in values:
  File "/usr/lib/python3.4/traceback.py", line 125, in _iter_chain
    context = exc.__context__
AttributeError: 'str' object has no attribute '__context__'

我要怎么做才能解决这个问题？如何为pyCharm（2.7.3）中的Python3测试选择合适的运行程序？谢谢

---

编辑：顺便说一句，pyCharm 2.7.3可以，在这里发布我的解决方法，让其他人更容易找到。将

PathToPyCharm/pycharm-2.7.3/helpers/pycharm/nose_utils.py

中的第58行替换为

if sys.version_info[0]==3:
    return ''.join(traceback.format_exception(exctype, value, tb, chain=False))
else:
    return ''.join(traceback.format_exception(exctype, value, tb))

使

nosetests

与python 3.4和2.7一起工作。然而，使用Python3.4，如果发生错误，整个堆栈跟踪将丢失。因此，调试成为一场噩梦：(

---

最后，我通过简单地将PyCharm版本升级到3.4.1解决了这个问题。

如果更改

return'。join（traceback.format\u exception（exctype，value，tb））

到

return'。join（traceback.format\u exception（exctype，value，tb，chain=False））是否会消失

在

/home/robert/program/pycharm-2.7.3/helpers/pycharm/nose_utils.py

的第58行？是的，谢谢，成功了。你想把它作为一个真实的答案而不是一条评论，这样我就可以把它标记为已回答了吗？嗯，现在的问题是，我再也没有回溯了。所以调试成了一场噩梦，有解决办法吗？而且，还有此外，在Python2.7.3下，使用关键字参数

chain=False

不起作用，测试也不会启动。但我想同时使用这两个参数。这个解决方法在pycharm 4.0.3和python 3.4.2中仍然有效。在pycharm 4.5中，这仍然是一个问题，但现在需要更改第70行。在4.5.4中仍然是一个问题，仍然可以继续使用第70行。我在PyCharm 5.0.4中仍然有这个问题。我在5.04中也有这个问题！我不想修改PyCharm的代码来让事情顺利进行！

if sys.version_info[0]==3:
    return ''.join(traceback.format_exception(exctype, value, tb, chain=False))
else:
    return ''.join(traceback.format_exception(exctype, value, tb))