diff --git a/Doc/reference/simple_stmts.rst b/Doc/reference/simple_stmts.rst
index b9cdd91db79..c0d818241bd 100644
--- a/Doc/reference/simple_stmts.rst
+++ b/Doc/reference/simple_stmts.rst
@@ -836,7 +836,7 @@ leading dot means the current package where the module making the import
 exists. Two dots means up one package level. Three dots is up two levels, etc.
 So if you execute ``from . import mod`` from a module in the ``pkg`` package
 then you will end up importing ``pkg.mod``. If you execute ``from ..subpkg2
-imprt mod`` from within ``pkg.subpkg1`` you will import ``pkg.subpkg2.mod``.
+import mod`` from within ``pkg.subpkg1`` you will import ``pkg.subpkg2.mod``.
 The specification for relative imports is contained within :pep:`328`.
 
 :func:`importlib.import_module` is provided to support applications that
diff --git a/Lib/string.py b/Lib/string.py
index 5e13d15338c..9c0ebe1fd46 100644
--- a/Lib/string.py
+++ b/Lib/string.py
@@ -607,7 +607,7 @@ class Formatter(object):
             return str(value)
         elif conversion is None:
             return value
-        raise ValueError("Unknown converion specifier {0!s}".format(conversion))
+        raise ValueError("Unknown conversion specifier {0!s}".format(conversion))
 
 
     # returns an iterable that contains tuples of the form:
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index 7cfe65be35e..56cbc35895c 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -1119,7 +1119,7 @@ class MixinStrUnicodeUserStringTest:
             format = '%%.%if' % prec
             value = 0.01
             for x in xrange(60):
-                value = value * 3.141592655 / 3.0 * 10.0
+                value = value * 3.14159265359 / 3.0 * 10.0
                 self.checkcall(format, "__mod__", value)
 
     def test_inplace_rewrites(self):
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index 516d6d9782a..d0f56625c8b 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -9,14 +9,28 @@ import os
 import re
 import sys
 import copy
+import functools
 import pickle
 import tempfile
 import unittest
-import warnings
 import test.test_support
 import test.string_tests
 import test.buffer_tests
 
+
+if sys.flags.bytes_warning:
+    def check_bytes_warnings(func):
+        @functools.wraps(func)
+        def wrapper(*args, **kw):
+            with test.test_support.check_warnings(('', BytesWarning)):
+                return func(*args, **kw)
+        return wrapper
+else:
+    # no-op
+    def check_bytes_warnings(func):
+        return func
+
+
 class Indexable:
     def __init__(self, value=0):
         self.value = value
@@ -26,12 +40,6 @@ class Indexable:
 
 class BaseBytesTest(unittest.TestCase):
 
-    def setUp(self):
-        self.warning_filters = warnings.filters[:]
-
-    def tearDown(self):
-        warnings.filters = self.warning_filters
-
     def test_basics(self):
         b = self.type2test()
         self.assertEqual(type(b), self.type2test)
@@ -120,8 +128,8 @@ class BaseBytesTest(unittest.TestCase):
         self.assertFalse(b3 <  b2)
         self.assertFalse(b3 <= b2)
 
+    @check_bytes_warnings
     def test_compare_to_str(self):
-        warnings.simplefilter('ignore', BytesWarning)
         # Byte comparisons with unicode should always fail!
         # Test this for all expected byte orders and Unicode character sizes
         self.assertEqual(self.type2test(b"\0a\0b\0c") == u"abc", False)
@@ -795,14 +803,8 @@ class AssortedBytesTest(unittest.TestCase):
     # Test various combinations of bytes and bytearray
     #
 
-    def setUp(self):
-        self.warning_filters = warnings.filters[:]
-
-    def tearDown(self):
-        warnings.filters = self.warning_filters
-
+    @check_bytes_warnings
     def test_repr_str(self):
-        warnings.simplefilter('ignore', BytesWarning)
         for f in str, repr:
             self.assertEqual(f(bytearray()), "bytearray(b'')")
             self.assertEqual(f(bytearray([0])), "bytearray(b'\\x00')")
@@ -853,8 +855,8 @@ class AssortedBytesTest(unittest.TestCase):
         b = bytearray(buf)
         self.assertEqual(b, bytearray(sample))
 
+    @check_bytes_warnings
     def test_to_str(self):
-        warnings.simplefilter('ignore', BytesWarning)
         self.assertEqual(str(b''), "b''")
         self.assertEqual(str(b'x'), "b'x'")
         self.assertEqual(str(b'\x80'), "b'\\x80'")
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 1151e867a4d..b309704631b 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -593,9 +593,9 @@ class UnicodeTest(
         )
 
         # UTF-8 specific decoding tests
-        self.assertEqual(unicode('\xf0\xa3\x91\x96', 'utf-8'), u'\U00023456' )
-        self.assertEqual(unicode('\xf0\x90\x80\x82', 'utf-8'), u'\U00010002' )
-        self.assertEqual(unicode('\xe2\x82\xac', 'utf-8'), u'\u20ac' )
+        self.assertEqual(unicode('\xf0\xa3\x91\x96', 'utf-8'), u'\U00023456')
+        self.assertEqual(unicode('\xf0\x90\x80\x82', 'utf-8'), u'\U00010002')
+        self.assertEqual(unicode('\xe2\x82\xac', 'utf-8'), u'\u20ac')
 
         # Other possible utf-8 test cases:
         # * strict decoding testing for all of the
@@ -1360,8 +1360,8 @@ class UnicodeTest(
             def __unicode__(self):
                 return u'__unicode__ overridden'
         u = U(u'xxx')
-        self.assertEquals("%s" % u, u'__unicode__ overridden')
-        self.assertEquals("{}".format(u), u'__unicode__ overridden')
+        self.assertEqual("%s" % u, u'__unicode__ overridden')
+        self.assertEqual("{}".format(u), u'__unicode__ overridden')
 
 
 def test_main():
diff --git a/Misc/pymemcompat.h b/Misc/pymemcompat.h
index 2757e3acddf..a0fa33663fd 100644
--- a/Misc/pymemcompat.h
+++ b/Misc/pymemcompat.h
@@ -72,7 +72,7 @@
 
    It is possible to support both the 2.0 and 2.2 GC APIs, but it's
    not pretty and this comment block is too narrow to contain a
-   desciption of what's required... */
+   description of what's required... */
 
 #if PY_VERSION_HEX < 0x020200B1
 #define PyObject_GC_New         PyObject_New