使用json时出现UnboundLocalError 错误

eveson

问题：
直接调用

1. self.rpc({"jsonrpc": "2.0", "method": "test", "params": [123], "id": 1})

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就没有问题
如果换成变量self.rpc(recvstr)  就会抛出异常
代码：

1. def test(num):
   
2.    str = {"FunId":1, "Stat":0, "param":num}
   
3.    print(str)
   
4.    return str
   
5. 
   
6. global recvstr
   
7. class MyServerProtocol(WebSocketServerProtocol):
   
8.    def __init__(self):
   
9.       self.rpc = JsonRpc()
   
10.       self.rpc['test'] = test
    
11.           
    
12.    def onConnect(self, request):
    
13.       print("Client connecting: {0}".format(request.peer))
    
14. 
    
15.    def onOpen(self):
    
16.       print("WebSocket connection open.")
    
17. 
    
18.    def onMessage(self, payload, isBinary):
    
19.       if isBinary:
    
20.          print("Binary message received: {0} bytes".format(len(payload)))
    
21.       else:
    
22.          recvstr = format(payload.decode('utf8'))
    
23.          print("Text message received:",recvstr)
    
24.          self.rpc(recvstr)
    
25.          #self.rpc({"jsonrpc": "2.0", "method": "test", "params": [123], "id": 1})
    
26.       ## echo back message verbatim
    
27.       self.sendMessage(payload, isBinary)
    
28. 
    
29.    def onClose(self, wasClean, code, reason):
    
30.       print("WebSocket connection closed: {0}".format(reason))
    

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错误：

1. Text message received: {"method": "test", "params": [123], "id": 1, "jsonrpc": "2.0"}
   
2. Exception in callback WebSocketAdapterProtocol._consume.<locals>.process(<Future finished result=None>) at /usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py:94
   
3. handle: <Handle WebSocketAdapterProtocol._consume.<locals>.process(<Future finished result=None>) at /usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py:94>
   
4. Traceback (most recent call last):
   
5.   File "/usr/local/lib/python3.4/asyncio/events.py", line 119, in _run
   
6.     self._callback(*self._args)
   
7.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 98, in process
   
8.     self._dataReceived(data)
   
9.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1328, in _dataReceived
   
10.     self.consumeData()
    
11.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1344, in consumeData
    
12.     while self.processData() and self.state != WebSocketProtocol.STATE_CLOSED:
    
13.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1503, in processData
    
14.     return self.processDataHybi()
    
15.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1817, in processDataHybi
    
16.     fr = self.onFrameEnd()
    
17.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1947, in onFrameEnd
    
18.     self._onMessageEnd()
    
19.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 154, in _onMessageEnd
    
20.     res = self.onMessageEnd()
    
21.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 743, in onMessageEnd
    
22.     self._onMessage(payload, self.message_is_binary)
    
23.   File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 160, in _onMessage
    
24.     res = self.onMessage(payload, isBinary)
    
25.   File "server.py", line 46, in onMessage
    
26.     self.rpc(recvstr)
    
27.   File "/usr/local/lib/python3.4/site-packages/jsonrpc2-0.4.1-py3.4.egg/jsonrpc2/__init__.py", line 206, in __call__
    
28.     return resdata
    
29. UnboundLocalError: local variable 'resdata' referenced before assignment

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eveson

请高手给看下怎么回事，搞了一上午了，哎，python用的不熟啊

修杰_JIANG

你测试的参数和运行是的参数 recvstr  数据类型不是一样的
recvstr.__class___ 看下

eveson

解决了。追到库jsonrpc的源码里面，找了个他自己使用的过程看了下，原来调用rpc之前必须json.loads一下。
C语言用惯了，什么事情，总想自己推理、实现，用python还是老老实实看api，看demo