diff --git a/Lib/base64.py b/Lib/base64.py
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -357,17 +357,17 @@ def a85decode(b, *, foldspaces=False, ad
     ignorechars should be a byte string containing characters to ignore from the
     input. This should only contain whitespace characters, and by default
     contains all whitespace characters in ASCII.
     """
     b = _bytes_from_decode_data(b)
     if adobe:
         if not (b.startswith(_A85START) and b.endswith(_A85END)):
             raise ValueError("Ascii85 encoded byte sequences must be bracketed "
-                             "by {} and {}".format(_A85START, _A85END))
+                             "by {!r} and {!r}".format(_A85START, _A85END))
         b = b[2:-2] # Strip off start/end markers
     #
     # We have to go through this stepwise, so as to ignore spaces and handle
     # special short sequences
     #
     packI = struct.Struct('!I').pack
     decoded = []
     decoded_append = decoded.append
diff --git a/Lib/configparser.py b/Lib/configparser.py
--- a/Lib/configparser.py
+++ b/Lib/configparser.py
@@ -281,17 +281,17 @@ class ParsingError(Error):
         # `filename' kept for compatibility.
         if filename and source:
             raise ValueError("Cannot specify both `filename' and `source'. "
                              "Use `source'.")
         elif not filename and not source:
             raise ValueError("Required argument `source' not given.")
         elif filename:
             source = filename
-        Error.__init__(self, 'Source contains parsing errors: %s' % source)
+        Error.__init__(self, 'Source contains parsing errors: %r' % source)
         self.source = source
         self.errors = []
         self.args = (source, )
 
     @property
     def filename(self):
         """Deprecated, use `source'."""
         warnings.warn(
@@ -317,17 +317,17 @@ class ParsingError(Error):
 
 
 class MissingSectionHeaderError(ParsingError):
     """Raised when a key-value pair is found before any section header."""
 
     def __init__(self, filename, lineno, line):
         Error.__init__(
             self,
-            'File contains no section headers.\nfile: %s, line: %d\n%r' %
+            'File contains no section headers.\nfile: %r, line: %d\n%r' %
             (filename, lineno, line))
         self.source = filename
         self.lineno = lineno
         self.line = line
         self.args = (filename, lineno, line)
 
 
 # Used in parser getters to indicate the default behaviour when a specific
diff --git a/Lib/distutils/command/register.py b/Lib/distutils/command/register.py
--- a/Lib/distutils/command/register.py
+++ b/Lib/distutils/command/register.py
@@ -295,10 +295,10 @@ Your selection [default 1]: ''', log.INF
         except urllib.error.URLError as e:
             result = 500, str(e)
         else:
             if self.show_response:
                 data = result.read()
             result = 200, 'OK'
         if self.show_response:
             dashes = '-' * 75
-            self.announce('%s%s%s' % (dashes, data, dashes))
+            self.announce('%r%r%r' % (dashes, data, dashes))
         return result
diff --git a/Lib/test/test_hash.py b/Lib/test/test_hash.py
--- a/Lib/test/test_hash.py
+++ b/Lib/test/test_hash.py
@@ -167,17 +167,17 @@ class HashBuiltinsTestCase(unittest.Test
             self.assertEqual(hash(obj), _default_hash(obj))
 
 class HashRandomizationTests:
 
     # Each subclass should define a field "repr_", containing the repr() of
     # an object to be tested
 
     def get_hash_command(self, repr_):
-        return 'print(hash(eval(%s.decode("utf-8"))))' % repr_.encode("utf-8")
+        return 'print(hash(eval(%r.decode("utf-8"))))' % repr_.encode("utf-8")
 
     def get_hash(self, repr_, seed=None):
         env = os.environ.copy()
         env['__cleanenv'] = True  # signal to assert_python not to do a copy
                                   # of os.environ on its own
         if seed is not None:
             env['PYTHONHASHSEED'] = str(seed)
         else: