grid widget: Allow proper 2D array syntax.

README.md

@@ -1101,8 +1101,7 @@ specified width +4 to allow for borders. The dimensions of the widget including
 borders are thus:  
 height = no. of rows * (font height + 4)  
 width = sum(column width + 4)  
-Cells may be addressed as a 1-dimensional list or by a `[row, col]` 2-list or
-2-tuple.
+Cells may be addressed as a 1 or 2-dimensional array.
 
 Constructor args:  
  1. `writer` The `Writer` instance (font and screen) to use.
@@ -1137,11 +1136,11 @@ Example uses:
 colwidth = (20, 30)  # Col 0 width is 20, subsequent columns 30
 self.grid = Grid(wri, row, col, colwidth, rows, cols, justify=Label.CENTRE)
 self.grid[20] = ""  # Clear cell 20 by setting its value to ""
-self.grid[[2, 5]] = str(42)  # Note syntax
+self.grid[2, 5] = str(42)  # 2D array syntax
 d = {}  # For indiviual control of cell appearance
 d["fgcolor"] = RED
 d["text"] = str(99)
-self.grid[(3, 7)] = d  # Specify color as well as text
+self.grid[3, 7] = d  # Specify color as well as text
 del d["fgcolor"]  # Revert to default
 d["invert"] = True
 self.grid[17] = d

gui/demos/calendar.py

@@ -33,7 +33,7 @@ class BaseScreen(Screen):
         row = self.lbl.mrow
         self.grid = Grid(wri, row, col, colwidth, rows, cols, justify=Label.CENTRE)
         for n, day in enumerate(DateCal.days):
-            self.grid[[0, n]] = day[:3]
+            self.grid[0, n] = day[:3]
 
         row = self.grid.mrow + 4
         ht = 30

gui/widgets/grid.py

@@ -35,7 +35,7 @@ class Grid(Widget):
             c = col
 
     def _idx(self, n):
-        if isinstance(n, tuple) or isinstance(n, list):
+        if isinstance(n, tuple) or isinstance(n, list):  # list allows old syntax l[[r, c]]
             if n[0] >= self.nrows:
                 raise ValueError("Grid row index too large")
             if n[1] >= self.ncols:
@@ -47,13 +47,14 @@ class Grid(Widget):
             raise ValueError("Grid cell index too large")
         return idx
 
-    def __getitem__(self, n):  # Return the Label instance
-        return self.cells[self._idx(n)]
+    def __getitem__(self, *args):  # Return the Label instance
+        return self.cells[self._idx(args[0])]
 
     # allow grid[[r, c]] = "foo" or kwargs for Label:
     # grid[[r, c]] = {"text": str(n), "fgcolor" : RED}
-    def __setitem__(self, n, x):
-        v = self.cells[self._idx(n)].value
+    def __setitem__(self, *args):
+        v = self.cells[self._idx(args[0])].value
+        x = args[1]
         _ = v(**x) if isinstance(x, dict) else v(x)
 
     def show(self):