diff --git a/Lib/test/test_compiler.py b/Lib/test/test_compiler.py
index 48f1643..6fb20c8 100644
--- a/Lib/test/test_compiler.py
+++ b/Lib/test/test_compiler.py
@@ -62,7 +62,7 @@
     def testLineNo(self):
         # Test that all nodes except Module have a correct lineno attribute.
         filename = __file__
-        if filename.endswith(".pyc") or filename.endswith(".pyo"):
+        if filename.endswith((".pyc", ".pyo")):
             filename = filename[:-1]
         tree = compiler.parseFile(filename)
         self.check_lineno(tree)
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 79be369..62c40eb 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -15,7 +15,7 @@
 # isdatadescriptor
 
 modfile = mod.__file__
-if modfile.endswith('c') or modfile.endswith('o'):
+if modfile.endswith(('c', 'o')):
     modfile = modfile[:-1]
 
 import __builtin__
diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
index e3fbf98..fa170ef 100644
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -130,10 +130,8 @@
         import os
         old_display = None
         import sys
-        if (sys.platform.startswith('win') or
-                sys.platform.startswith('darwin') or
-                sys.platform.startswith('cygwin')):
-            return # no failure possible on windows?
+        if sys.platform.startswith(('win', 'darwin', 'cygwin')):
+            return  # no failure possible on windows?
         if 'DISPLAY' in os.environ:
             old_display = os.environ['DISPLAY']
             del os.environ['DISPLAY']