Created by: imistyrain

• 标题：Mac 1.5版本python2.7下用VSCode运行代码报RuntimeError: already started
• 版本、环境信息：    1）PaddlePaddle版本：请提供您的PaddlePaddle版本号 1.5    2）CPU：厂内标配i5, 无mkl    3）GPU：无    4）系统环境：Mac OS 10.14 之前用1.4版本在VSCode运行的好好的代码，在VSCode里跑报RuntimeError: already started, 在外面单独跑的话没问题，用python3.5在VSCode里跑也没问题

            Traceback (most recent call last):
              File "/Users/***/.vscode/extensions/ms-python.python-2019.3.6558/pythonFiles/lib/python/ptvsd/log.py", line 110, in g
                return f(*args, **kwargs)
              File "/Users/***/.vscode/extensions/ms-python.python-2019.3.6558/pythonFiles/lib/python/ptvsd/pydevd_hooks.py", line 74, in start_client
                sock, start_session = daemon.start_client((host, port))
              File "/Users/gongyanhe/.vscode/extensions/ms-python.python-2019.3.6558/pythonFiles/lib/python/ptvsd/daemon.py", line 214, in start_client
                with self.started():
              File "/usr/local/Cellar/python@2/2.7.15_3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
                return self.gen.next()
              File "/Users/***/.vscode/extensions/ms-python.python-2019.3.6558/pythonFiles/lib/python/ptvsd/daemon.py", line 110, in started
                self.start()
              File "/Users/***/.vscode/extensions/ms-python.python-2019.3.6558/pythonFiles/lib/python/ptvsd/daemon.py", line 145, in start
                raise RuntimeError('already started')
            RuntimeError: already started