diff --git a/examples/cpushark/Capture.py b/examples/cpushark/Capture.py
index 16e27a4..3009717 100644
--- a/examples/cpushark/Capture.py
+++ b/examples/cpushark/Capture.py
@@ -1,6 +1,5 @@
 import bisect
 import re
-import struct
 
 from Foundation import NSAutoreleasePool, NSObject, NSThread
 from PyObjCTools import AppHelper
diff --git a/examples/cpushark/CpuShark.py b/examples/cpushark/CpuShark.py
index a88780c..bddd6e5 100644
--- a/examples/cpushark/CpuShark.py
+++ b/examples/cpushark/CpuShark.py
@@ -1,10 +1,6 @@
 import sys
 
 sys.path.insert(0, "/Users/oleavr/src/frida/build/frida-macos-universal/lib/python2.7/site-packages")
-import AppDelegate
-import Capture
-import MainWindowController
-import ProcessList
 
 if __name__ == "__main__":
     from PyObjCTools import AppHelper
diff --git a/examples/cpushark/setup.py b/examples/cpushark/setup.py
index 9506af8..6b7d521 100644
--- a/examples/cpushark/setup.py
+++ b/examples/cpushark/setup.py
@@ -5,7 +5,6 @@ Usage:
     python setup.py py2app
 """
 
-import py2app
 from setuptools import setup
 
 plist = dict(
diff --git a/tests/__init__.py b/tests/__init__.py
index 3a85b97..8da1466 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,2 +1,4 @@
 from .test_core import TestCore
 from .test_rpc import TestRpc
+
+__all__ = ["TestCore", "TestRpc"]
diff --git a/tests/test_rpc.py b/tests/test_rpc.py
index 5370e36..b5b1b7b 100644
--- a/tests/test_rpc.py
+++ b/tests/test_rpc.py
@@ -1,4 +1,3 @@
-import platform
 import subprocess
 import threading
 import time
@@ -15,7 +14,6 @@ class TestRpc(unittest.TestCase):
 
     @classmethod
     def setUp(cls):
-        system = platform.system()
         cls.target = subprocess.Popen([target_program], stdin=subprocess.PIPE)
         # TODO: improve injectors to handle injection into a process that hasn't yet finished initializing
         time.sleep(0.05)