feat[py]: python compatible field support

protocol/src/test/python/pyProtocol/ObjectB.py

@@ -2,23 +2,36 @@
 class ObjectB:
 
     flag = False  # bool
+    innerCompatibleValue = 0  # int
 
     def protocolId(self):
         return 103
 
     @classmethod
     def write(cls, buffer, packet):
-        if buffer.writePacketFlag(packet):
+        if packet is None:
+            buffer.writeInt(0)
             return
+        beforeWriteIndex = buffer.getWriteOffset()
+        buffer.writeInt(4)
         buffer.writeBool(packet.flag)
+        buffer.writeInt(packet.innerCompatibleValue)
+        buffer.adjustPadding(4, beforeWriteIndex)
         pass
 
     @classmethod
     def read(cls, buffer):
-        if not buffer.readBool():
+        length = buffer.readInt()
+        if length == 0:
             return None
+        beforeReadIndex = buffer.getReadOffset()
         packet = ObjectB()
         result0 = buffer.readBool() 
         packet.flag = result0
+        if buffer.compatibleRead(beforeReadIndex, length):
+            result1 = buffer.readInt()
+            packet.innerCompatibleValue = result1
+        if length > 0:
+            buffer.setReadOffset(beforeReadIndex + length)
         return packet