Simplify OperationProxy.__doc__

Author: mvantellingen

src/zeep/client.py

@@ -13,11 +13,10 @@ class OperationProxy(object):
     def __init__(self, service_proxy, operation_name):
         self._proxy = service_proxy
         self._op_name = operation_name
-        try:
-            signature = str(self._proxy._binding._operations[operation_name])
-            self.__doc__ = signature
-        except:
-            self.__doc__ = 'OperationProxy for %s' % operation_name
+
+    @property
+    def __doc__(self):
+        return str(self._proxy._binding._operations[self._op_name])
 
     def __call__(self, *args, **kwargs):
         """Call the operation with the given args and kwargs.