title: zeppelin_ipyspark.py at apache zeppelin get SyntaxError: invalid syntax
body: <p>when i running code with pyspark in apache zeppelin 0.8.1 , i get error like </p>
  
  <pre><code>java.lang.NullPointerException
      at org.apache.thrift.transport.TSocket.open(TSocket.java:170)
      at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:51)
  </code></pre>
  
  <p>...</p>
  
  <p>so i open all file in my folder zeppelin</p>
  
  <p>and i try to running file <code>zeppelin_ipyspark.py</code> at <code>D:\zeppelin-0.8.1-bin-all\interpreter\spark\python</code> with cmd </p>
  
  <p>and i get error</p>
  
  <pre><code>D:\zeppelin-0.8.1-bin-all\interpreter\spark\python&gt;zeppelin_ipyspark.py
    File "D:\zeppelin-0.8.1-bin-all\interpreter\spark\python\zeppelin_ipyspark.py", line 29
      port=${JVM_GATEWAY_PORT}, auth_token=gateway_secret, auto_convert=True))
           ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>so can you help me?</p>