oracle
diff --git a/graalpython/lib-python/3/_tkinter/__init__.py b/graalpython/lib-python/3/_tkinter/__init__.py
@@ -0,0 +1,55 @@
+# _tkinter package -- low-level interface to libtk and libtcl.
+#
+# This is an internal module, applications should "import tkinter" instead.
+#
+# This version is based PyPy which itself is based on cffi, and is a translation of _tkinter.c
+# from CPython, version 2.7.4.
+
+import sys
+
+class TclError(Exception):
+    pass
+
+from .tklib_cffi import ffi as tkffi, lib as tklib
+
+from .app import TkApp
+from .tclobj import TclObject as Tcl_Obj
+from .app import FromTclString, ToTCLString
+
+TK_VERSION = FromTclString(tkffi.string(tklib.get_tk_version()))
+TCL_VERSION = FromTclString(tkffi.string(tklib.get_tcl_version()))
+
+READABLE = tklib.TCL_READABLE
+WRITABLE = tklib.TCL_WRITABLE
+EXCEPTION = tklib.TCL_EXCEPTION
+DONT_WAIT = tklib.TCL_DONT_WAIT
+
+def create(screenName=None, baseName=None, className=None,
+           interactive=False, wantobjects=False, wantTk=True,
+           sync=False, use=None):
+    return TkApp(screenName, baseName, className,
+                 interactive, wantobjects, wantTk, sync, use)
+
+def dooneevent(flags=0):
+    return tklib.Tcl_DoOneEvent(flags)
+
+
+def _flatten(item):
+    def _flatten1(output, item, depth):
+        if depth > 1000:
+            raise ValueError("nesting too deep in _flatten")
+        if not isinstance(item, (list, tuple)):
+            raise TypeError("argument must be sequence")
+        # copy items to output tuple
+        for o in item:
+            if isinstance(o, (list, tuple)):
+                _flatten1(output, o, depth + 1)
+            elif o is not None:
+                output.append(o)
+
+    result = []
+    _flatten1(result, item, 0)
+    return tuple(result)
+
+# Encoding is not specified explicitly, but "must be passed argv[0]" sounds like a simple conversion to raw bytes.
+tklib.Tcl_FindExecutable(ToTCLString(sys.executable))