[tutorial] add python T14-Hold tutorial

ChunelFeng · ChunelFeng · commit 5fbc0cb55bca · 2025-03-04T00:22:04.000+08:00
diff --git a/python/tutorial/MyGNode/MyHoldNode.py b/python/tutorial/MyGNode/MyHoldNode.py
@@ -0,0 +1,27 @@
+"""
+@Author: Chunel
+@Contact: chunel@foxmail.com
+@File: MyHoldNode
+@Time: 2025/3/4 00:08
+@Desc: 
+"""
+
+from PyCGraph import GNode, CStatus
+
+from MyParams.MyParam import MyParam
+
+class MyHoldNode(GNode):
+    param_key = 'hold-param'
+    def init(self):
+        return self.createGParam(MyParam(), self.param_key)
+
+    def run(self):
+        param: MyParam = self.getGParam(self.param_key)
+        param.value += 1
+        print('current value is {0}'.format(param.value))
+        return CStatus()
+
+    def isHold(self):
+        param: MyParam = self.getGParam(self.param_key)
+        print('enter hold path, value is {0}'.format(param.value))
+        return param.value < 5
diff --git a/python/tutorial/T14-Hold.py b/python/tutorial/T14-Hold.py
@@ -0,0 +1,26 @@
+"""
+@Author: Chunel
+@Contact: chunel@foxmail.com
+@File: T14-Hold
+@Time: 2025/3/4 00:15
+@Desc: 
+"""
+
+from PyCGraph import GPipeline, CStatus
+
+from MyGNode.MyHoldNode import MyHoldNode
+from MyGNode.MyNode1 import MyNode1
+
+
+def tutorial_hold():
+    pipeline = GPipeline()
+    a, b = MyHoldNode(), MyNode1()
+
+    pipeline.registerGElement(a, set(), 'myHold')
+    pipeline.registerGElement(b, {a}, 'nodeA')
+    pipeline.process(3)
+
+
+if __name__ == '__main__':
+    tutorial_hold()
+
