backport to python 2.4 and pep8.

theano/gof/tests/test_utils.py

 import theano
 from theano.gof.utils import give_variables_names, unique
+from theano.gof.python25 import all
+
 
 def test_give_variables_names():
     x = theano.tensor.matrix('x')
@@ -10,6 +12,7 @@ def test_give_variables_names():
     assert all(var.name for var in variables)
     assert unique([var.name for var in variables])
 
+
 def test_give_variables_names_idempotence():
     x = theano.tensor.matrix('x')
     y = x + 1
@@ -23,6 +26,7 @@ def test_give_variables_names_idempotence():
 
     assert names == names2
 
+
 def test_give_variables_names_small():
     x = theano.tensor.matrix('x')
     y = theano.tensor.dot(x, x)
@@ -30,4 +34,3 @@ def test_give_variables_names_small():
     give_variables_names(fgraph.variables)
     assert all(var.name for var in fgraph.variables)
     assert unique([var.name for var in fgraph.variables])
-