reduce ast types from Num/Str/NameConstant to just Constant per warnings

mpf/core/placeholder_manager.py

@@ -642,9 +642,7 @@ def __init__(self, machine):
         """Initialize."""
         super().__init__(machine)
         self._eval_methods = {
-            ast.Num: self._eval_num,
-            ast.Str: self._eval_str,
-            ast.NameConstant: self._eval_constant,
+            ast.Constant: self._eval_constant,
             ast.BinOp: self._eval_bin_op,
             ast.UnaryOp: self._eval_unary_op,
             ast.Compare: self._eval_compare,
@@ -655,8 +653,6 @@ def __init__(self, machine):
             ast.IfExp: self._eval_if,
             ast.Tuple: self._eval_tuple,
         }
-        if hasattr(ast, "Constant"):
-            self._eval_methods[ast.Constant] = self._eval_constant
 
     def _eval_tuple(self, node, variables, subscribe):
         return tuple([self._eval(x, variables, subscribe) for x in node.elts])
@@ -668,18 +664,6 @@ def _parse_template(template_str):
         except SyntaxError:
             raise AssertionError('Failed to parse template "{}"'.format(template_str))
 
-    @staticmethod
-    def _eval_num(node, variables, subscribe):
-        del variables
-        del subscribe
-        return node.n, []
-
-    @staticmethod
-    def _eval_str(node, variables, subscribe):
-        del variables
-        del subscribe
-        return node.s, []
-
     @staticmethod
     def _eval_constant(node, variables, subscribe):
         del variables