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我正在尝试通过pyper在python中运行R，但我得到了这个OSError：

 r = pr.R(RCMD="/Library/Frameworks/R.framework/")
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-9-028f8367ac11> in <module>()
----> 1 r = pr.R(RCMD="/Library/Frameworks/R.framework/")

/Library/Python/2.7/site-packages/pyper.pyc in __init__(self, RCMD, max_len, use_numpy, use_pandas, use_dict, host, user, ssh, return_err, dump_stdout)
    598                 childstderr = file('nul', 'a')
    599 
--> 600         self.__dict__['prog'] = Popen(RCMD, stdin=PIPE, stdout=PIPE, stderr=return_err and _STDOUT or childstderr, startupinfo=info)
    601         self.__call__(self.Rfun)
    602 

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.pyc in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
    708                                 p2cread, p2cwrite,
    709                                 c2pread, c2pwrite,
--> 710                                 errread, errwrite)
    711         except Exception:
    712             # Preserve original exception in case os.close raises.

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.pyc in _execute_child(self, args, executable, preexec_fn, close_fds, cwd, env, universal_newlines, startupinfo, creationflags, shell, to_close, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)
   1333                         raise
   1334                 child_exception = pickle.loads(data)
-> 1335                 raise child_exception
   1336 
   1337 

OSError: [Errno 13] Permission denied
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