diff --git a/topaz/ast.py b/topaz/ast.py
index 50d3ead13..5002668bf 100644
--- a/topaz/ast.py
+++ b/topaz/ast.py
@@ -287,6 +287,7 @@ def compile(self, ctx):
             ctx.emit(consts.LOAD_SINGLETON_CLASS)
             self.compile_body(ctx, "singletonclass")
 
+
 class Module(BaseModule):
     def compile(self, ctx):
         if self.scope is not None:
diff --git a/topaz/objects/arrayobject.py b/topaz/objects/arrayobject.py
index 0654e1e6d..d6f4e2d2e 100644
--- a/topaz/objects/arrayobject.py
+++ b/topaz/objects/arrayobject.py
@@ -337,9 +337,9 @@ def method_insert(self, space, i, args_w):
             return self
         if i < 0:
             if i < -length - 1:
-                 raise space.error(space.w_IndexError,
-                      "index %d too small for array; minimum: %d" % (i + 1, -length)
-                  )
+                raise space.error(space.w_IndexError,
+                    "index %d too small for array; minimum: %d" % (i + 1, -length)
+                )
             i += length + 1
         assert i >= 0
         for w_e in args_w:
diff --git a/topaz/objects/fileobject.py b/topaz/objects/fileobject.py
index 1882711ee..4fc5c7ec9 100644
--- a/topaz/objects/fileobject.py
+++ b/topaz/objects/fileobject.py
@@ -1,5 +1,4 @@
 import os
-import sys
 import stat
 
 from topaz.coerce import Coerce
@@ -9,7 +8,6 @@
 from topaz.objects.hashobject import W_HashObject
 from topaz.objects.objectobject import W_Object
 from topaz.objects.ioobject import W_IOObject
-from topaz.objects.stringobject import W_StringObject
 from topaz.system import IS_WINDOWS
 from topaz.utils.ll_file import O_BINARY, ftruncate, isdir, fchmod
 from topaz.utils.filemode import map_filemode
diff --git a/topaz/objects/rangeobject.py b/topaz/objects/rangeobject.py
index 47d86d2a7..ebb86984a 100644
--- a/topaz/objects/rangeobject.py
+++ b/topaz/objects/rangeobject.py
@@ -22,12 +22,12 @@ def method_initialize(self, space, w_start, w_end, excl=False):
         if self.w_start is not None or self.w_end is not None:
             raise space.error(space.w_NameError, "`initialize' called twice")
         if space.send(w_start, space.newsymbol("<=>"), [w_end]) is space.w_nil:
-            raise space.error(space.w_ArgumentError, "bad value for range" )
+            raise space.error(space.w_ArgumentError, "bad value for range")
 
         self.w_start = w_start
         self.w_end = w_end
         self.exclusive = excl
-      
+
     @classdef.method("begin")
     def method_begin(self, space):
         return self.w_start
diff --git a/topaz/utils/filemode.py b/topaz/utils/filemode.py
index 983e875c2..f3c1f9a75 100644
--- a/topaz/utils/filemode.py
+++ b/topaz/utils/filemode.py
@@ -1,5 +1,4 @@
 import os
-import sys
 
 from topaz.objects.stringobject import W_StringObject
 from topaz.utils.ll_file import O_BINARY
diff --git a/topaz/utils/ll_dir.py b/topaz/utils/ll_dir.py
index 5ae2c80e1..c69eba8af 100644
--- a/topaz/utils/ll_dir.py
+++ b/topaz/utils/ll_dir.py
@@ -1,5 +1,3 @@
-import sys
-
 from rpython.rlib import rposix
 from rpython.rtyper.lltypesystem import rffi, lltype
 from rpython.rtyper.tool import rffi_platform as platform
diff --git a/topaz/utils/ll_file.py b/topaz/utils/ll_file.py
index 402ffe9f7..bd0a33141 100755
--- a/topaz/utils/ll_file.py
+++ b/topaz/utils/ll_file.py
@@ -1,6 +1,4 @@
 import os
-import stat
-import sys
 
 from rpython.rtyper.lltypesystem import rffi
 from rpython.rtyper.tool import rffi_platform as platform
@@ -12,12 +10,13 @@
 if IS_WINDOWS:
     O_BINARY = os.O_BINARY
 
-    eci = ExternalCompilationInfo(includes=['windows.h'])
+    eci = ExternalCompilationInfo(includes=["windows.h"])
+
     class CConfig:
         _compilation_info_ = eci
     config = platform.configure(CConfig)
 
-    _chsize = rffi.llexternal('_chsize',
+    _chsize = rffi.llexternal("_chsize",
         [rffi.INT, rffi.LONG], rffi.INT,
         compilation_info=eci,
     )