Grid widget __getitem__() returns iterator.

extras/README.md

@@ -67,7 +67,7 @@ Constructor args:
 
 Methods:  
  * `show` Draw the grid lines to the framebuffer.
- * `__getitem__` Return a list containing one or more `Label` instances.
+ * `__getitem__` Returns an iterator enabling `Label` instances to be accessed.
  * `__setitem__` Assign a value to one or more labels. If multiple labels are
  specified and a single text value is passed, all labels will receive that
  value. If an iterator is passed, consecutive labels will receive values from
@@ -96,6 +96,11 @@ grid[1:3, 1:3] = (str(n) for n in range(2))  # Produces
 # 0 1
 # 1 1
 ```
+Read access:
+```python
+for label in grid[2, 0:]:
+    v = label.value()  # Access each label in row 2
+```
 Sample usage (complete example):
 ```python
 from color_setup import ssd

extras/widgets/grid.py

@@ -34,12 +34,10 @@ class Grid(DObject):
             r += self.cheight
             c = col
 
-    def __getitem__(self, *args):  # Return the Label instance
+    def __getitem__(self, *args):
         indices = do_args(args, self.nrows, self.ncols)
-        res = []
         for i in indices:
-            res.append(self.cells[i])
+            yield self.cells[i]
-        return res
 
     # allow grid[r, c] = "foo" or kwargs for Label:
     # grid[r, c] = {"text": str(n), "fgcolor" : RED}