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安装pythereum和复仇蛇后，我跑了使用测试：$ pytest -m test_contracts.py我得到了下面的错误，我似乎无法找出真正的问题是：错误：etheruem-serpent;版本冲突
======= ================================================== =======================测试会话启动======================== ================================================== ====== platform darwin - Python 2.7.12，pytest-3.0.0，py-1.4.31，pluggy-0.3.1 rootdir：/ Users/someone/SmartContract/pyethereum，inifile： plugins： catchlog-1.2.2，timeout-1.0.0 收集47942项
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/main.py", line 96, in wrap_session
INTERNALERROR> session.exitstatus = doit(config, session) or 0
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/main.py", line 130, in _main
INTERNALERROR> config.hook.pytest_collection(session=session)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 724, in __call__
INTERNALERROR> return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 338, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 333, in <lambda>
INTERNALERROR> _MultiCall(methods, kwargs, hook.spec_opts).execute()
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 596, in execute
INTERNALERROR> res = hook_impl.function(*args)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/main.py", line 139, in pytest_collection
INTERNALERROR> return session.perform_collect()
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/main.py", line 592, in perform_collect
INTERNALERROR> config=self.config, items=items)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 724, in __call__
INTERNALERROR> return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 338, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 333, in <lambda>
INTERNALERROR> _MultiCall(methods, kwargs, hook.spec_opts).execute()
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/vendored_packages/pluggy.py", line 596, in execute
INTERNALERROR> res = hook_impl.function(*args)
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/mark.py", line 84, in pytest_collection_modifyitems
INTERNALERROR> if not matchmark(colitem, matchexpr):
INTERNALERROR> File "/usr/local/lib/python2.7/site-packages/_pytest/mark.py", line 124, in matchmark
INTERNALERROR> return eval(markexpr, {}, MarkMapping(colitem.keywords))
INTERNALERROR> File "<string>", line 1, in <module>
INTERNALERROR> AttributeError: 'bool' object has no attribute 'py'