More FAQs.

pep-0280.txt

@@ -414,6 +414,33 @@ FAQs
 
     A. It is intended to support that fully.
 
+    Q. What happens when a global is deleted?
+
+    A. The module's celldict would have a cell with a NULL objptr for
+       that key.
+
+    Q. What would the C code for LOAD_GLOBAL_CELL look like?
+
+    A. case LOAD_GLOBAL_CELL:
+           cell = func_cells[oparg];
+           x = cell->objptr;
+           if (x == NULL) {
+               x = cell->cellptr->objptr;
+               if (x == NULL) {
+                   ... error recovery ...
+                   break;
+               }
+           }
+           Py_INCREF(x);
+           continue;
+
+    Q. What happens in the module's top-level code where there is
+       presumably no func_cells array?
+
+    A. We could do some code analysis and create a func_cells array,
+       or we could use LOAD_NAME which should use PyMapping_GetItem on
+       the globals dict.
+
 
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