Index: Lib/tkinter/test/test_tkinter/test_canvas.py
===================================================================
--- Lib/tkinter/test/test_tkinter/test_canvas.py	(revision 0)
+++ Lib/tkinter/test/test_tkinter/test_canvas.py	(revision 0)
@@ -0,0 +1,32 @@
+import unittest
+import tkinter
+from test.support import requires, run_unittest
+
+requires('gui')
+
+class CanvasTest(unittest.TestCase):
+    def setUp(self):
+        self.canvas = tkinter.Canvas()
+
+    def tearDown(self):
+        self.canvas.destroy()
+
+    def test_coords_islist(self):
+        """Checks if Canvas.coords returns list as its docstring suggests"""
+        self.assertIsInstance(self.canvas.coords(0), list)
+
+    def test_coords_empty(self):
+        """ Canvas.coords should return empty list if item does not exists """
+        self.assertEqual([], self.canvas.coords(1))
+
+    def test_coords_created(self):
+        """ Checks if Canvas.coords returns correct coords """
+        line_args = [0.0, 0.0, 1.0, 1.0]
+        line = self.canvas.create_line(*line_args)
+        self.assertEqual(line_args, self.canvas.coords(line))
+
+tests_gui = (CanvasTest,)
+
+if __name__ == '__main__':
+    run_unittest(*tests_gui)
+
Index: Lib/tkinter/__init__.py
===================================================================
--- Lib/tkinter/__init__.py	(revision 83065)
+++ Lib/tkinter/__init__.py	(working copy)
@@ -2157,9 +2157,9 @@
     def coords(self, *args):
         """Return a list of coordinates for the item given in ARGS."""
         # XXX Should use _flatten on args
-        return map(getdouble,
+        return list(map(getdouble,
                            self.tk.splitlist(
-                   self.tk.call((self._w, 'coords') + args)))
+                   self.tk.call((self._w, 'coords') + args))))
     def _create(self, itemType, args, kw): # Args: (val, val, ..., cnf={})
         """Internal function."""
         args = _flatten(args)