Added test to check for wrong shape in power function.

theano/tensor/basic.py

@@ -5023,5 +5023,5 @@ def ptp(a, axis=None):
     return out
 
 
-def power(x,y):
+def power(x, y):
     return x**y

theano/tensor/tests/test_basic.py

@@ -6896,10 +6896,17 @@ class T_Power():
     def test_multiple_power(self):
         x = tensor.matrix()
         y = [1, 2, 3]
-        z = power(x,y)
+        z = power(x, y)
         f = function([x], z)
         assert allclose(f([1, 2, 3]), [1, 4, 27])
 
+    def test_wrong_shape(self):
+        x = tensor.matrix()
+        y = [1, 2, 3]
+        z = power(x, y)
+        f = function([x], z)
+        self.assertRaise(ValueError, f, [1, 2, 3, 4])
+
 """
 
 if __name__ == '__main__':