diff --git a/lib/python/ast/Match.php b/lib/python/ast/Match.php
deleted file mode 100644
index 6057ef0..0000000
--- a/lib/python/ast/Match.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace python\ast;
-
-/**
-*/
-class Match
-{
-    private $_self;
-
-    public function __construct()
-    {
-        $this->_self = \PyCore::import('ast')->Match();
-    }
-
-}
diff --git a/lib/python/ast/Return.php b/lib/python/ast/Return.php
deleted file mode 100644
index 8890bb0..0000000
--- a/lib/python/ast/Return.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace python\ast;
-
-/**
-*/
-class Return
-{
-    private $_self;
-
-    public function __construct()
-    {
-        $this->_self = \PyCore::import('ast')->Return();
-    }
-
-}
diff --git a/lib/python/ast/Try.php b/lib/python/ast/Try.php
deleted file mode 100644
index 6a45bf5..0000000
--- a/lib/python/ast/Try.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace python\ast;
-
-/**
-*/
-class Try
-{
-    private $_self;
-
-    public function __construct()
-    {
-        $this->_self = \PyCore::import('ast')->Try();
-    }
-
-}
diff --git a/lib/python/ast/While.php b/lib/python/ast/While.php
deleted file mode 100644
index 3845962..0000000
--- a/lib/python/ast/While.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace python\ast;
-
-/**
-*/
-class While
-{
-    private $_self;
-
-    public function __construct()
-    {
-        $this->_self = \PyCore::import('ast')->While();
-    }
-
-}
diff --git a/lib/python/ast/Yield.php b/lib/python/ast/Yield.php
deleted file mode 100644
index 3df1ab8..0000000
--- a/lib/python/ast/Yield.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-namespace python\ast;
-
-/**
-*/
-class Yield
-{
-    private $_self;
-
-    public function __construct()
-    {
-        $this->_self = \PyCore::import('ast')->Yield();
-    }
-
-}
diff --git a/lib/python/ast/List.php b/lib/python/ast/_And.php
similarity index 62%
rename from lib/python/ast/List.php
rename to lib/python/ast/_And.php
index f7c0a30..2a7eb55 100644
--- a/lib/python/ast/List.php
+++ b/lib/python/ast/_And.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class List
+class _And
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->List();
+        $this->_self = \PyCore::import('ast')->_And();
     }
 
 }
diff --git a/lib/python/ast/Global.php b/lib/python/ast/_Break.php
similarity index 60%
rename from lib/python/ast/Global.php
rename to lib/python/ast/_Break.php
index 020a714..d3d72c5 100644
--- a/lib/python/ast/Global.php
+++ b/lib/python/ast/_Break.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class Global
+class _Break
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->Global();
+        $this->_self = \PyCore::import('ast')->_Break();
     }
 
 }
diff --git a/lib/python/ast/Continue.php b/lib/python/ast/_Continue.php
similarity index 58%
rename from lib/python/ast/Continue.php
rename to lib/python/ast/_Continue.php
index fe07792..8940e5e 100644
--- a/lib/python/ast/Continue.php
+++ b/lib/python/ast/_Continue.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class Continue
+class _Continue
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->Continue();
+        $this->_self = \PyCore::import('ast')->_Continue();
     }
 
 }
diff --git a/lib/python/ast/If.php b/lib/python/ast/_For.php
similarity index 62%
rename from lib/python/ast/If.php
rename to lib/python/ast/_For.php
index 48ecde0..87ff774 100644
--- a/lib/python/ast/If.php
+++ b/lib/python/ast/_For.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class If
+class _For
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->If();
+        $this->_self = \PyCore::import('ast')->_For();
     }
 
 }
diff --git a/lib/python/ast/_Global.php b/lib/python/ast/_Global.php
new file mode 100644
index 0000000..f86b58e
--- /dev/null
+++ b/lib/python/ast/_Global.php
@@ -0,0 +1,15 @@
+<?php
+namespace python\ast;
+
+/**
+*/
+class _Global
+{
+    private $_self;
+
+    public function __construct()
+    {
+        $this->_self = \PyCore::import('ast')->_Global();
+    }
+
+}
diff --git a/lib/python/ast/And.php b/lib/python/ast/_If.php
similarity index 62%
rename from lib/python/ast/And.php
rename to lib/python/ast/_If.php
index bb6cd87..b997992 100644
--- a/lib/python/ast/And.php
+++ b/lib/python/ast/_If.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class And
+class _If
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->And();
+        $this->_self = \PyCore::import('ast')->_If();
     }
 
 }
diff --git a/lib/python/ast/Break.php b/lib/python/ast/_List.php
similarity index 61%
rename from lib/python/ast/Break.php
rename to lib/python/ast/_List.php
index b4b1ad7..8f98da7 100644
--- a/lib/python/ast/Break.php
+++ b/lib/python/ast/_List.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class Break
+class _List
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->Break();
+        $this->_self = \PyCore::import('ast')->_List();
     }
 
 }
diff --git a/lib/python/ast/_Match.php b/lib/python/ast/_Match.php
new file mode 100644
index 0000000..a6e6acb
--- /dev/null
+++ b/lib/python/ast/_Match.php
@@ -0,0 +1,15 @@
+<?php
+namespace python\ast;
+
+/**
+*/
+class _Match
+{
+    private $_self;
+
+    public function __construct()
+    {
+        $this->_self = \PyCore::import('ast')->_Match();
+    }
+
+}
diff --git a/lib/python/ast/Or.php b/lib/python/ast/_Or.php
similarity index 62%
rename from lib/python/ast/Or.php
rename to lib/python/ast/_Or.php
index 5a660e3..b2bf192 100644
--- a/lib/python/ast/Or.php
+++ b/lib/python/ast/_Or.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class Or
+class _Or
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->Or();
+        $this->_self = \PyCore::import('ast')->_Or();
     }
 
 }
diff --git a/lib/python/ast/_Return.php b/lib/python/ast/_Return.php
new file mode 100644
index 0000000..8cde431
--- /dev/null
+++ b/lib/python/ast/_Return.php
@@ -0,0 +1,15 @@
+<?php
+namespace python\ast;
+
+/**
+*/
+class _Return
+{
+    private $_self;
+
+    public function __construct()
+    {
+        $this->_self = \PyCore::import('ast')->_Return();
+    }
+
+}
diff --git a/lib/python/ast/For.php b/lib/python/ast/_Try.php
similarity index 62%
rename from lib/python/ast/For.php
rename to lib/python/ast/_Try.php
index e1d3b73..14beacc 100644
--- a/lib/python/ast/For.php
+++ b/lib/python/ast/_Try.php
@@ -3,13 +3,13 @@
 
 /**
 */
-class For
+class _Try
 {
     private $_self;
 
     public function __construct()
     {
-        $this->_self = \PyCore::import('ast')->For();
+        $this->_self = \PyCore::import('ast')->_Try();
     }
 
 }
diff --git a/lib/python/ast/_While.php b/lib/python/ast/_While.php
new file mode 100644
index 0000000..66f3ece
--- /dev/null
+++ b/lib/python/ast/_While.php
@@ -0,0 +1,15 @@
+<?php
+namespace python\ast;
+
+/**
+*/
+class _While
+{
+    private $_self;
+
+    public function __construct()
+    {
+        $this->_self = \PyCore::import('ast')->_While();
+    }
+
+}
diff --git a/lib/python/ast/_Yield.php b/lib/python/ast/_Yield.php
new file mode 100644
index 0000000..fb6892f
--- /dev/null
+++ b/lib/python/ast/_Yield.php
@@ -0,0 +1,15 @@
+<?php
+namespace python\ast;
+
+/**
+*/
+class _Yield
+{
+    private $_self;
+
+    public function __construct()
+    {
+        $this->_self = \PyCore::import('ast')->_Yield();
+    }
+
+}
diff --git a/tools/src/Tool.php b/tools/src/Tool.php
index 1a7567c..0456015 100644
--- a/tools/src/Tool.php
+++ b/tools/src/Tool.php
@@ -18,6 +18,22 @@ class  Tool
         '__sizeof__',
     ];
 
+    protected const KEYWORDS = [
+        'and',
+        'break',
+        'continue',
+        'for',
+        'global',
+        'if',
+        'list',
+        'match',
+        'or',
+        'return',
+        'try',
+        'while',
+        'yield',
+    ];
+
     static function render($tplFile, $outFile, $vars, $prefix = ''): void
     {
         extract($vars);
@@ -65,6 +81,9 @@ static function valueToRepr($v, $python = false): ?string
 
     public static function parseClass($module_name, $class_name, $class): void
     {
+        if (in_array(strtolower($class_name), self::KEYWORDS)) {
+            $class_name = '_' . $class_name;
+        }
         $methods = [];
         $properties = [];
         $constructor = ['call' => '', 'args' => ''];