diff --git a/coffee/__init__.py b/coffee/__init__.py
index 63980e08..6fc464df 100644
--- a/coffee/__init__.py
+++ b/coffee/__init__.py
@@ -36,7 +36,6 @@
 import sys
 
 from coffee.citations import update_citations
-from coffee.vectorizer import VectStrategy
 from coffee.logger import LOG_DEFAULT, set_log_level, warn
 from coffee.system import set_architecture, set_compiler, set_isa
 
diff --git a/coffee/base.py b/coffee/base.py
index 10cc2c02..bcbe2e87 100644
--- a/coffee/base.py
+++ b/coffee/base.py
@@ -1339,6 +1339,7 @@ def __init__(self, scope):
     def __str__(self):
         return self._scope
 
+
 LOCAL = Scope("LOCAL")
 EXTERNAL = Scope("EXTERNAL")
 BUFFER = Scope("BUFFER")
diff --git a/coffee/rewriter.py b/coffee/rewriter.py
index a68cec2f..ebb87b9a 100644
--- a/coffee/rewriter.py
+++ b/coffee/rewriter.py
@@ -562,7 +562,6 @@ def sharing_graph_rewrite(self):
 
         # Construct the sharing graph
         nodes, edges = [], []
-        operands = summands(self.stmt.rvalue)
         for i in summands(self.stmt.rvalue):
             symbols = zip(*explore_operator(i))[0] if not isinstance(i, Symbol) else [i]
             lsymbols = [s for s in symbols if any(d in lda[s] for d in linear_dims)]
diff --git a/coffee/visitors/utilities.py b/coffee/visitors/utilities.py
index c8ba627f..061fea8a 100644
--- a/coffee/visitors/utilities.py
+++ b/coffee/visitors/utilities.py
@@ -5,11 +5,9 @@
 from copy import deepcopy
 from collections import OrderedDict, defaultdict
 import numpy as np
-import networkx as nx
 
 from coffee.visitor import Visitor
 from coffee.base import Sum, Sub, Prod, Div, ArrayInit, SparseArrayInit
-import coffee.utils
 
 
 __all__ = ["ReplaceSymbols", "CheckUniqueness", "Uniquify", "Evaluate",
@@ -123,7 +121,8 @@ def __init__(self, decls, track_zeros):
         import coffee.vectorizer
         self.up = coffee.vectorizer.vect_roundup
         self.down = coffee.vectorizer.vect_rounddown
-        self.make_itspace = coffee.utils.ItSpace
+        from coffee.utils import ItSpace
+        self.make_itspace = ItSpace
         super(Evaluate, self).__init__()
 
     def visit_object(self, o, *args, **kwargs):
@@ -284,7 +283,9 @@ def default_retval(cls):
     """
 
     def __init__(self, symbols):
+        from coffee.utils import flatten
         self.symbols = symbols
+        self.flatten = flatten
         super(ProjectExpansion, self).__init__()
 
     def visit_object(self, o, *args, **kwargs):
@@ -305,13 +306,13 @@ def visit_Prod(self, o, parent=None, *args, **kwargs):
             projection = self.default_retval()
             for n in o.children:
                 projection.extend(self.visit(n, parent=o, *args, **kwargs))
-            return [list(coffee.utils.flatten(projection))]
+            return [list(self.flatten(projection))]
         else:
             # Only the top level Prod, in a chain of Prods, should do the
             # tensor product
             projection = [self.visit(n, parent=o, *args, **kwargs) for n in o.children]
             product = itertools.product(*projection)
-            ret = [list(coffee.utils.flatten(i)) for i in product] or projection
+            ret = [list(self.flatten(i)) for i in product] or projection
         return ret
 
     def visit_Symbol(self, o, *args, **kwargs):
diff --git a/setup.cfg b/setup.cfg
index 796c344b..9478c194 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [flake8]
 ignore =
-    E501,F403,F405,E226,E265,E731,E402,E266,
+    E501,F403,F405,E226,E265,E731,E402,E266,F999,
     FI14,FI54,
     FI50,FI51,FI53
 exclude = .git,,__pycache__,build,dist,doc/source/conf.py
diff --git a/tests/test_visitors.py b/tests/test_visitors.py
index 5a0e6c1b..a0a6634f 100644
--- a/tests/test_visitors.py
+++ b/tests/test_visitors.py
@@ -375,9 +375,8 @@ def test_find_coffee_expressions_single():
 
     val = ret[assign]
 
-    assert len(val) == 3
+    assert len(val) == 2
 
-    assert val[2] == ()
     assert val[1] == [(tree.children[0], tree)]
     assert val[0] == tree.children[0].children[0]
 
@@ -405,13 +404,11 @@ def test_find_coffee_expressions_nested():
 
     assert val1[0] == tree.children[0].children[0]
     assert val1[1] == [(tree.children[0], tree)]
-    assert val1[2] == ()
 
     assert val2[0] == tree.children[0].body[0].children[0].children[0]
     assert val2[1] == [(tree.children[0], tree),
                        (tree.children[0].body[0].children[0],
                         tree.children[0].body[0])]
-    assert val2[2] == ("i", )
 
 
 def test_symbol_modes_simple():