[CODEGEN] Avoid use of deprecated AST nodes (#418)

Co-authored-by: hauntsaninja <>

python/triton/code_gen.py

@@ -305,9 +305,6 @@ class CodeGenerator(ast.NodeVisitor):
         for stmt in node.orelse:
             ast.NodeVisitor.generic_visit(self, stmt)
 
-    def visit_Str(self, node):
-        return ast.literal_eval(node)
-
     def visit_Subscript(self, node):
         assert node.ctx.__class__.__name__ == "Load"
         lhs = self.visit(node.value)
@@ -374,9 +371,6 @@ class CodeGenerator(ast.NodeVisitor):
     def visit_Index(self, node):
         return self.visit(node.value)
 
-    def visit_NameConstant(self, node):
-        return node.value
-
     def visit_keyword(self, node):
         return {node.arg: self.visit(node.value)}
 
@@ -393,8 +387,18 @@ class CodeGenerator(ast.NodeVisitor):
             return fn(*args, _builder=self.builder, **kws)
         return fn(*args, **kws)
 
-    def visit_Num(self, node):
-        return node.n
+    def visit_Constant(self, node):
+        return node.value
+
+    if sys.version_info < (3, 8):
+        def visit_NameConstant(self, node):
+            return node.value
+
+        def visit_Num(self, node):
+            return node.n
+
+        def visit_Str(self, node):
+            return ast.literal_eval(node)
 
     def visit_Attribute(self, node):
         lhs = self.visit(node.value)