accumulate: fix lambda usage (see exercism#287)

Author: behrtam

accumulate/accumulate_test.py

@@ -18,9 +18,8 @@ def test_divmod(self):
 
     def test_composition(self):
         inp = [10, 17, 23]
-        fn1 = lambda x: divmod(x, 7)
-        fn2 = lambda x: 7 * x[0] + x[1]
-        self.assertEqual(inp, accumulate(accumulate(inp, fn1), fn2))
+        self.assertEqual(inp, accumulate(accumulate(inp, lambda x: divmod(x, 7)),
+                         lambda x: 7 * x[0] + x[1]))
 
     def test_capitalize(self):
         inp = ['hello', 'world']
@@ -30,8 +29,8 @@ def test_capitalize(self):
     def test_recursive(self):
         inp = list('abc')
         out = [['a1', 'a2', 'a3'], ['b1', 'b2', 'b3'], ['c1', 'c2', 'c3']]
-        fn = lambda x: accumulate(list('123'), lambda y: x + y)
-        self.assertEqual(out, accumulate(inp, fn))
+        self.assertEqual(out, accumulate(inp, lambda x: accumulate(list('123'),
+                         lambda y: x + y)))
 
 
 if __name__ == '__main__':