python结合grads绘图的问题

Question

 import grads #导入库
ga=grads.GrADS() #使用GrADS客户端程序，要求GrADS版本大于2.0.0
fh = ga.open("http://monsoondata.org:9090/dods/model") #读取文件
ga("display ps")   #显示图形
ga("printim D:/x.png white") #保存图形，将背景设为白色

在canopy下面运行这个例子，提示下面的错误信息，怎么回事：
%run "E:\software\pythonGrads\pygrads-1.1.9\test1.py"
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GrADSError Traceback (most recent call last)
E:\software\pythonGrads\pygrads-1.1.9\test1.py in ()
1 # -*- coding: utf-8 -*-
2 from grads.gacore import GaCore
----> 3 ga = GaCore(Bin='grads') # 如果GrADS的版本小于2.0，可以使用ga = GaCore(Bin='gradsnc')
4 fh = ga.open("http://monsoondata.org:9090/dods/model")
5 ga("display ps")

E:\software\pythonGrads\pygrads-1.1.9\grads\gacore.pyc in init(self, Bin, Echo, Opts, Port, Strict, Verb, Window)
174 # Parse out inital splash screen
175 # -------------------------------
--> 176 rc = self._parseReader()
177
178 # Record GrADS version

E:\software\pythonGrads\pygrads-1.1.9\grads\gacore.pyc in _parseReader(self, Quiet)
1037 got = self.Reader.readline()
1038 if got == '':
-> 1039 raise GrADSError, "GrADS terminated while waiting for response"
1040 tokens = split(got)
1041

GrADSError: 'GrADS terminated while waiting for response'

Answer 1

http://blog.csdn.net/S20091103372/article/details/46521077