Issue #20299: Argument Clinic custom converters may now change the default

larryhastings · larryhastings · commit b470575e2492 · 2014-01-18T21:54:15.000-08:00
value of c_default and py_default with a class member.
diff --git a/Misc/NEWS b/Misc/NEWS
@@ -101,6 +101,9 @@ Tests
 Tools/Demos
 -----------
 
+- Issue #20299: Argument Clinic custom converters may now change the default
+  value of c_default and py_default with a class member.
+
 - Issue #20287: Argument Clinic's output is now configurable, allowing
   delaying its output or even redirecting it to a separate file.
 
diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
@@ -1893,8 +1893,10 @@ def __init__(self, name, function, default=unspecified, *, c_default=None, py_de
                     self.__class__.__name__, default, name, types_str))
             self.default = default
 
-        self.c_default = c_default
-        self.py_default = py_default
+        if c_default:
+            self.c_default = c_default
+        if py_default:
+            self.py_default = py_default
 
         if annotation != unspecified:
             fail("The 'annotation' parameter is not currently permitted.")
