[Dy2Stat]BugFix StaticAanlysis with gast.Subscript (#32969)

* BugFix StaticAanlysis with gast.Subscript

* remove codes

python/paddle/fluid/dygraph/dygraph_to_static/static_analysis.py

@@ -368,5 +368,8 @@ class StaticAnalysisVisitor(object):
 
             if isinstance(node.func, gast.Name):
                 return self.var_env.get_var_type(node.func.id)
+        if isinstance(node, gast.Subscript):
+            if self.is_tensor_node(node.value):
+                return {NodeVarType.TENSOR}
 
         return {NodeVarType.STATEMENT}

python/paddle/fluid/tests/unittests/dygraph_to_static/test_list.py

@@ -16,6 +16,7 @@ from __future__ import print_function
 
 import unittest
 
+import paddle
 import numpy as np
 import paddle.fluid as fluid
 from paddle.fluid.dygraph.jit import declarative
@@ -61,6 +62,33 @@ def test_list_append_in_for_loop(x, iter_num):
     return a[0]
 
 
+paddle.jit.set_code_level(100)
+
+
+def test_list_append_in_for_subscript(x):
+    x = fluid.dygraph.to_variable(x)
+    iter_num = paddle.shape(x)[0]
+    a = []
+    for i in range(iter_num):
+        x = x + 1
+        a.append(x)
+    out = paddle.concat(a)
+    return out[0]
+
+
+def test_list_append_in_while_loop_subscript(x):
+    x = fluid.dygraph.to_variable(x)
+    iter_num = paddle.shape(x)[0]
+    a = []
+    i = 0
+    while i < iter_num:
+        x = x + 1
+        a.append(x)
+        i += 1
+    out = paddle.concat(a)
+    return out[0]
+
+
 def test_list_append_in_for_loop_with_concat(x, iter_num):
     x = fluid.dygraph.to_variable(x)
     a = []
@@ -261,5 +289,16 @@ class TestListInForLoopWithConcat(TestListInWhileLoopWithStack):
         self.all_dygraph_funcs = [test_list_append_in_for_loop_with_concat, ]
 
 
+class TestListInForLoopWithSubscript(TestListWithoutControlFlow):
+    def init_dygraph_func(self):
+        self.all_dygraph_funcs = [
+            test_list_append_in_for_subscript,
+            test_list_append_in_while_loop_subscript
+        ]
+
+    def init_data(self):
+        self.input = np.random.random((3, 4)).astype('float32')
+
+
 if __name__ == '__main__':
     unittest.main()