diff --git a/Doc/library/imp.rst b/Doc/library/imp.rst
index 1345b25..7270e3c 100644
--- a/Doc/library/imp.rst
+++ b/Doc/library/imp.rst
@@ -30,6 +30,9 @@
    :const:`PY_SOURCE`, :const:`PY_COMPILED`, or :const:`C_EXTENSION`, described
    below.
 
+   .. deprecated:: 3.3
+      Use the constants defined on :mod:`importlib.machinery` instead.
+
 
 .. function:: find_module(name[, path])
 
diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index 6855a79..ddfaa21 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -477,6 +477,43 @@
 This module contains the various objects that help :keyword:`import`
 find and load modules.
 
+.. attribute:: SOURCE_SUFFIXES
+
+   A list of strings representing the recognized file suffixes for source
+   modules.
+
+   .. versionadded:: 3.3
+
+.. attribute:: DEBUG_BYTECODE_SUFFIXES
+
+   A list of strings representing the file suffixes for non-optimized bytecode
+   modules.
+
+   .. versionadded:: 3.3
+
+.. attribute:: OPTIMIZED_BYTECODE_SUFFIXES
+
+   A list of strings representing the file suffixes for optimized bytecode
+   modules.
+
+   .. versionadded:: 3.3
+
+.. attribute:: BYTECODE_SUFFIXES
+
+   A list of strings representing the recognized file suffixes for bytecode
+   modules. Set to either :attr:`DEBUG_BYTECODE_SUFFIXES` or
+   :attr:`OPTIMIZED_BYTECODE_SUFFIXES` based on whether ``__debug__`` is true.
+
+   .. versionadded:: 3.3
+
+.. attribute:: EXTENSION_SUFFIXES
+
+   A list of strings representing the the recognized file suffixes for
+   extension modules.
+
+   .. versionadded:: 3.3
+
+
 .. class:: BuiltinImporter
 
     An :term:`importer` for built-in modules. All known built-in modules are
diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index 90b7220..611f780 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -190,6 +190,10 @@
    compared to the constants defined in the :mod:`imp` module; see the
    documentation for that module for more information on module types.
 
+   .. deprecated:: 3.3
+      You may check the file path's suffix against the supported suffixes
+      listed in :mod:`importlib.machinery` to infer the same information.
+
 
 .. function:: getmodulename(path)
 
diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
index 97d0c2f..61eb094 100644
--- a/Lib/ctypes/util.py
+++ b/Lib/ctypes/util.py
@@ -40,8 +40,8 @@
             clibname = 'msvcr%d' % (version * 10)
 
         # If python was built with in debug mode
-        import imp
-        if imp.get_suffixes()[0][0] == '_d.pyd':
+        import importlib.machinery
+        if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
             clibname += 'd'
         return clibname+'.dll'
 
diff --git a/Lib/idlelib/PathBrowser.py b/Lib/idlelib/PathBrowser.py
index d88a48e..9954f07 100644
--- a/Lib/idlelib/PathBrowser.py
+++ b/Lib/idlelib/PathBrowser.py
@@ -1,6 +1,7 @@
 import os
 import sys
 import imp
+import importlib.machinery
 
 from idlelib.TreeWidget import TreeItem
 from idlelib.ClassBrowser import ClassBrowser, ModuleBrowserTreeItem
@@ -70,7 +71,9 @@
 
     def listmodules(self, allnames):
         modules = {}
-        suffixes = imp.get_suffixes()
+        suffixes = importlib.machinery.EXTENSION_SUFFIXES[:]
+        suffixes += importlib.machinery.SOURCE_SUFFIXES[:]
+        suffixes += importlib.machinery.BYTECODE_SUFFIXES[:]
         sorted = []
         for suff, mode, flag in suffixes:
             i = -len(suff)
diff --git a/Lib/imp.py b/Lib/imp.py
index 717b6a4..f60f050 100644
--- a/Lib/imp.py
+++ b/Lib/imp.py
@@ -17,9 +17,11 @@
 from importlib._bootstrap import cache_from_source
 
 from importlib import _bootstrap
+from importlib import machinery
 import os
 import sys
 import tokenize
+import warnings
 
 
 # XXX "deprecate" once find_module(), load_module(), and get_suffixes() are
@@ -37,9 +39,12 @@
 
 
 def get_suffixes():
+    warnings.warn('imp.get_suffixes() is deprecated; use the constants '
+                  'defined on importlib.machinery instead',
+                  DeprecationWarning, 2)
     extensions = [(s, 'rb', C_EXTENSION) for s in extension_suffixes()]
-    source = [(s, 'U', PY_SOURCE) for s in _bootstrap._SOURCE_SUFFIXES]
-    bytecode = [(_bootstrap._BYTECODE_SUFFIX, 'rb', PY_COMPILED)]
+    source = [(s, 'U', PY_SOURCE) for s in machinery.SOURCE_SUFFIXES]
+    bytecode = [(s, 'rb', PY_COMPILED) for s in machinery.BYTECODE_SUFFIXES]
 
     return extensions + source + bytecode
 
@@ -61,7 +66,7 @@
         raise ValueError('expected only 2 dots in '
                          '{!r}'.format(pycache_filename))
     base_filename = pycache_filename.partition('.')[0]
-    return os.path.join(head, base_filename + _bootstrap._SOURCE_SUFFIXES[0])
+    return os.path.join(head, base_filename + machinery.SOURCE_SUFFIXES[0])
 
 
 class NullImporter:
@@ -126,7 +131,7 @@
 # XXX deprecate
 def load_package(name, path):
     if os.path.isdir(path):
-        extensions = _bootstrap._SOURCE_SUFFIXES + [_bootstrap._BYTECODE_SUFFIX]
+        extensions = machinery.SOURCE_SUFFIXES[:] + [machinery.BYTECODE_SUFFIXES]
         for extension in extensions:
             path = os.path.join(path, '__init__'+extension)
             if os.path.exists(path):
@@ -190,19 +195,21 @@
 
     for entry in path:
         package_directory = os.path.join(entry, name)
-        for suffix in ['.py', _bootstrap._BYTECODE_SUFFIX]:
+        for suffix in ['.py', machinery.BYTECODE_SUFFIXES[0]]:
             package_file_name = '__init__' + suffix
             file_path = os.path.join(package_directory, package_file_name)
             if os.path.isfile(file_path):
                 return None, package_directory, ('', '', PKG_DIRECTORY)
-        for suffix, mode, type_ in get_suffixes():
-            file_name = name + suffix
-            file_path = os.path.join(entry, file_name)
-            if os.path.isfile(file_path):
-                break
-        else:
-            continue
-        break  # Break out of outer loop when breaking out of inner loop.
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore')
+            for suffix, mode, type_ in get_suffixes():
+                file_name = name + suffix
+                file_path = os.path.join(entry, file_name)
+                if os.path.isfile(file_path):
+                    break
+            else:
+                continue
+            break  # Break out of outer loop when breaking out of inner loop.
     else:
         raise ImportError('No module name {!r}'.format(name), name=name)
 
diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
index 9952b06..ce23043 100644
--- a/Lib/importlib/_bootstrap.py
+++ b/Lib/importlib/_bootstrap.py
@@ -163,11 +163,14 @@
 
 _PYCACHE = '__pycache__'
 
-_SOURCE_SUFFIXES = ['.py']  # _setup() adds .pyw as needed.
+SOURCE_SUFFIXES = ['.py']  # _setup() adds .pyw as needed.
 
-_DEBUG_BYTECODE_SUFFIX = '.pyc'
-_OPT_BYTECODE_SUFFIX = '.pyo'
-_BYTECODE_SUFFIX = _DEBUG_BYTECODE_SUFFIX if __debug__ else _OPT_BYTECODE_SUFFIX
+DEBUG_BYTECODE_SUFFIXES = ['.pyc']
+OPTIMIZED_BYTECODE_SUFFIXES = ['.pyo']
+if __debug__:
+    BYTECODE_SUFFIXES = DEBUG_BYTECODE_SUFFIXES
+else:
+    BYTECODE_SUFFIXES = OPTIMIZED_BYTECODE_SUFFIXES
 
 def cache_from_source(path, debug_override=None):
     """Given the path to a .py file, return the path to its .pyc/.pyo file.
@@ -181,10 +184,13 @@
 
     """
     debug = __debug__ if debug_override is None else debug_override
-    suffix = _DEBUG_BYTECODE_SUFFIX if debug else _OPT_BYTECODE_SUFFIX
+    if debug:
+        suffixes = DEBUG_BYTECODE_SUFFIXES
+    else:
+        suffixes = OPTIMIZED_BYTECODE_SUFFIXES
     head, tail = _path_split(path)
     base_filename, sep, _ = tail.partition('.')
-    filename = ''.join([base_filename, sep, _TAG, suffix])
+    filename = ''.join([base_filename, sep, _TAG, suffixes[0]])
     return _path_join(head, _PYCACHE, filename)
 
 
@@ -1147,15 +1153,15 @@
     setattr(self_module, '_MAGIC_NUMBER', _imp_module.get_magic())
     setattr(self_module, '_TAG', _imp.get_tag())
     if builtin_os == 'nt':
-        _SOURCE_SUFFIXES.append('.pyw')
+        SOURCE_SUFFIXES.append('.pyw')
 
 
 def _install(sys_module, _imp_module):
     """Install importlib as the implementation of import."""
     _setup(sys_module, _imp_module)
     extensions = ExtensionFileLoader, _imp_module.extension_suffixes(), False
-    source = SourceFileLoader, _SOURCE_SUFFIXES, True
-    bytecode = SourcelessFileLoader, [_BYTECODE_SUFFIX], True
+    source = SourceFileLoader, SOURCE_SUFFIXES, True
+    bytecode = SourcelessFileLoader, BYTECODE_SUFFIXES, True
     supported_loaders = [extensions, source, bytecode]
     sys.path_hooks.extend([FileFinder.path_hook(*supported_loaders)])
     sys.meta_path.extend([BuiltinImporter, FrozenImporter, PathFinder])
diff --git a/Lib/importlib/machinery.py b/Lib/importlib/machinery.py
index 07465ce..d5e7250 100644
--- a/Lib/importlib/machinery.py
+++ b/Lib/importlib/machinery.py
@@ -1,5 +1,9 @@
 """The machinery of importlib: finders, loaders, hooks, etc."""
 
+import _imp
+
+from ._bootstrap import (SOURCE_SUFFIXES, DEBUG_BYTECODE_SUFFIXES,
+                         OPTIMIZED_BYTECODE_SUFFIXES, BYTECODE_SUFFIXES)
 from ._bootstrap import BuiltinImporter
 from ._bootstrap import FrozenImporter
 from ._bootstrap import PathFinder
@@ -7,3 +11,5 @@
 from ._bootstrap import SourceFileLoader
 from ._bootstrap import SourcelessFileLoader
 from ._bootstrap import ExtensionFileLoader
+
+EXTENSION_SUFFIXES = _imp.extension_suffixes()
diff --git a/Lib/importlib/test/benchmark.py b/Lib/importlib/test/benchmark.py
index 1686314..183e818 100644
--- a/Lib/importlib/test/benchmark.py
+++ b/Lib/importlib/test/benchmark.py
@@ -9,7 +9,6 @@
 import decimal
 import imp
 import importlib
-import importlib._bootstrap
 import importlib.machinery
 import json
 import os
@@ -72,7 +71,7 @@
             assert not os.path.exists(imp.cache_from_source(mapping[name]))
             sys.meta_path.append(importlib.machinery.PathFinder)
             loader = (importlib.machinery.SourceFileLoader,
-                      importlib._bootstrap._SOURCE_SUFFIXES, True)
+                      importlib.machinery.SOURCE_SUFFIXES, True)
             sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
             for result in bench(name, lambda: sys.modules.pop(name), repeat=repeat,
                                 seconds=seconds):
@@ -110,7 +109,7 @@
     with source_util.create_modules(name) as mapping:
         sys.meta_path.append(importlib.machinery.PathFinder)
         loader = (importlib.machinery.SourceFileLoader,
-                  importlib._bootstrap._SOURCE_SUFFIXES, True)
+                  importlib.machinery.SOURCE_SUFFIXES, True)
         sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
         def cleanup():
             sys.modules.pop(name)
@@ -145,7 +144,7 @@
     with source_util.create_modules(name) as mapping:
         sys.meta_path.append(importlib.machinery.PathFinder)
         loader = (importlib.machinery.SourceFileLoader,
-                importlib._bootstrap._SOURCE_SUFFIXES, True)
+                importlib.machinery.SOURCE_SUFFIXES, True)
         sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
         py_compile.compile(mapping[name])
         assert os.path.exists(imp.cache_from_source(mapping[name]))
diff --git a/Lib/importlib/test/extension/util.py b/Lib/importlib/test/extension/util.py
index d149169..a266dd9 100644
--- a/Lib/importlib/test/extension/util.py
+++ b/Lib/importlib/test/extension/util.py
@@ -1,4 +1,5 @@
 import imp
+from importlib import machinery
 import os
 import sys
 
@@ -6,10 +7,9 @@
 EXT = None
 FILENAME = None
 NAME = '_testcapi'
-_file_exts = [x[0] for x in imp.get_suffixes() if x[2] == imp.C_EXTENSION]
 try:
     for PATH in sys.path:
-        for EXT in _file_exts:
+        for EXT in machinery.EXTENSION_SUFFIXES:
             FILENAME = NAME + EXT
             FILEPATH = os.path.join(PATH, FILENAME)
             if os.path.exists(os.path.join(PATH, FILENAME)):
@@ -18,4 +18,3 @@
         PATH = EXT = FILENAME = FILEPATH = None
 except StopIteration:
     pass
-del _file_exts
diff --git a/Lib/importlib/test/source/test_case_sensitivity.py b/Lib/importlib/test/source/test_case_sensitivity.py
index fade25f..21a4378 100644
--- a/Lib/importlib/test/source/test_case_sensitivity.py
+++ b/Lib/importlib/test/source/test_case_sensitivity.py
@@ -1,5 +1,6 @@
 """Test case-sensitivity (PEP 235)."""
 from importlib import _bootstrap
+from importlib import machinery
 from .. import util
 from . import util as source_util
 import imp
@@ -20,12 +21,12 @@
     assert name != name.lower()
 
     def find(self, path):
-        finder = _bootstrap.FileFinder(path,
-                                        (_bootstrap.SourceFileLoader,
-                                            _bootstrap._SOURCE_SUFFIXES,
+        finder = machinery.FileFinder(path,
+                                      (machinery.SourceFileLoader,
+                                            machinery.SOURCE_SUFFIXES,
                                             True),
-                                        (_bootstrap.SourcelessFileLoader,
-                                            [_bootstrap._BYTECODE_SUFFIX],
+                                        (machinery.SourcelessFileLoader,
+                                            machinery.BYTECODE_SUFFIXES,
                                             True))
         return finder.find_module(self.name)
 
diff --git a/Lib/importlib/test/source/test_finder.py b/Lib/importlib/test/source/test_finder.py
index 45b804f..bbe0163 100644
--- a/Lib/importlib/test/source/test_finder.py
+++ b/Lib/importlib/test/source/test_finder.py
@@ -1,7 +1,7 @@
 from .. import abc
 from . import util as source_util
 
-from importlib import _bootstrap
+from importlib import machinery
 import errno
 import imp
 import os
@@ -36,11 +36,11 @@
     """
 
     def import_(self, root, module):
-        loader_details = [(_bootstrap.SourceFileLoader,
-                            _bootstrap._SOURCE_SUFFIXES, True),
-                          (_bootstrap.SourcelessFileLoader,
-                            [_bootstrap._BYTECODE_SUFFIX], True)]
-        finder = _bootstrap.FileFinder(root, *loader_details)
+        loader_details = [(machinery.SourceFileLoader,
+                            machinery.SOURCE_SUFFIXES, True),
+                          (machinery.SourcelessFileLoader,
+                            machinery.BYTECODE_SUFFIXES, True)]
+        finder = machinery.FileFinder(root, *loader_details)
         return finder.find_module(module)
 
     def run_test(self, test, create=None, *, compile_=None, unlink=None):
@@ -138,8 +138,8 @@
 
     def test_empty_string_for_dir(self):
         # The empty string from sys.path means to search in the cwd.
-        finder = _bootstrap.FileFinder('', (_bootstrap.SourceFileLoader,
-            _bootstrap._SOURCE_SUFFIXES, True))
+        finder = machinery.FileFinder('', (machinery.SourceFileLoader,
+            machinery.SOURCE_SUFFIXES, True))
         with open('mod.py', 'w') as file:
             file.write("# test file for importlib")
         try:
@@ -150,8 +150,8 @@
 
     def test_invalidate_caches(self):
         # invalidate_caches() should reset the mtime.
-        finder = _bootstrap.FileFinder('', (_bootstrap.SourceFileLoader,
-            _bootstrap._SOURCE_SUFFIXES, True))
+        finder = machinery.FileFinder('', (machinery.SourceFileLoader,
+            machinery.SOURCE_SUFFIXES, True))
         finder._path_mtime = 42
         finder.invalidate_caches()
         self.assertEqual(finder._path_mtime, -1)
diff --git a/Lib/importlib/test/source/test_path_hook.py b/Lib/importlib/test/source/test_path_hook.py
index df69b4d..54c0699 100644
--- a/Lib/importlib/test/source/test_path_hook.py
+++ b/Lib/importlib/test/source/test_path_hook.py
@@ -1,6 +1,6 @@
 from . import util as source_util
 
-from importlib import _bootstrap
+from importlib import machinery
 import imp
 import unittest
 
@@ -10,8 +10,8 @@
     """Test the path hook for source."""
 
     def path_hook(self):
-        return _bootstrap.FileFinder.path_hook((_bootstrap.SourceFileLoader,
-            _bootstrap._SOURCE_SUFFIXES, True))
+        return machinery.FileFinder.path_hook((machinery.SourceFileLoader,
+            machinery.SOURCE_SUFFIXES, True))
 
     def test_success(self):
         with source_util.create_modules('dummy') as mapping:
diff --git a/Lib/inspect.py b/Lib/inspect.py
index fc9f612..56d05fb 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -29,14 +29,15 @@
 __author__ = 'Ka-Ping Yee <ping@lfw.org>'
 __date__ = '1 Jan 2001'
 
-import sys
-import os
-import types
-import itertools
-import re
 import imp
-import tokenize
+import importlib.machinery
+import itertools
 import linecache
+import os
+import re
+import sys
+import tokenize
+import types
 from operator import attrgetter
 from collections import namedtuple
 
@@ -432,6 +433,8 @@
 
 def getmoduleinfo(path):
     """Get the module name, suffix, mode, and module type for a given file."""
+    warnings.warn('inspect.getmoduleinfo() is deprecated', DeprecationWarning,
+                  2)
     filename = os.path.basename(path)
     suffixes = [(-len(suffix), suffix, mode, mtype)
                     for suffix, mode, mtype in imp.get_suffixes()]
@@ -450,12 +453,14 @@
     Return None if no way can be identified to get the source.
     """
     filename = getfile(object)
-    if filename[-4:].lower() in ('.pyc', '.pyo'):
-        filename = filename[:-4] + '.py'
-    for suffix, mode, kind in imp.get_suffixes():
-        if 'b' in mode and filename[-len(suffix):].lower() == suffix:
-            # Looks like a binary file.  We want to only return a text file.
-            return None
+    all_bytecode_suffixes = importlib.machinery.DEBUG_BYTECODE_SUFFIXES[:]
+    all_bytecode_suffixes += importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES[:]
+    if any(filename.endswith(s) for s in all_bytecode_suffixes):
+        filename = (os.path.splitext(filename)[0] +
+                    importlib.machinery.SOURCE_SUFFIXES[0])
+    elif any(filename.endswith(s) for s in
+                 importlib.machinery.EXTENSION_SUFFIXES):
+        return None
     if os.path.exists(filename):
         return filename
     # only return a non-existent filename if the module has a PEP 302 loader
diff --git a/Lib/modulefinder.py b/Lib/modulefinder.py
index c0910aa..683e305 100644
--- a/Lib/modulefinder.py
+++ b/Lib/modulefinder.py
@@ -222,8 +222,9 @@
         # But we must also collect Python extension modules - although
         # we cannot separate normal dlls from Python extensions.
         suffixes = []
-        for triple in imp.get_suffixes():
-            suffixes.append(triple[0])
+        suffixes += importlib.machinery.EXTENSION_SUFFIXES[:]
+        suffixes += importlib.machinery.SOURCE_SUFFIXES[:]
+        suffixes += importlib.machinery.BYTECODE_SUFFIXES[:]
         for dir in m.__path__:
             try:
                 names = os.listdir(dir)
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index b319d11..9c9658c 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -53,6 +53,7 @@
 
 import builtins
 import imp
+import importlib.machinery
 import inspect
 import io
 import os
@@ -220,20 +221,34 @@
     mtime = os.stat(filename).st_mtime
     lastupdate, result = cache.get(filename, (None, None))
     if lastupdate is None or lastupdate < mtime:
-        info = inspect.getmoduleinfo(filename)
         try:
             file = tokenize.open(filename)
         except IOError:
             # module can't be opened, so skip it
             return None
-        if info and 'b' in info[2]: # binary modules have to be imported
-            try: module = imp.load_module('__temp__', file, filename, info[1:])
-            except: return None
+        binary_suffixes = importlib.machinery.BYTECODE_SUFFIXES[:]
+        binary_suffixes += importlib.machinery.EXTENSION_SUFFIXES[:]
+        if any(filename.endswith(x) for x in binary_suffixes):
+            # binary modules have to be imported
+            file.close()
+            if any(filename.endswith(x) for x in
+                    importlib.machinery.BYTECODE_SUFFIXES):
+                loader = importlib.machinery.SourcelessFileLoader('__temp__',
+                                                                  filename)
+            else:
+                loader = importlib.machinery.ExtensionFileLoader('__temp__',
+                                                                 filename)
+            try:
+                module = loader.load_module('__temp__')
+            except:
+                return None
             result = (module.__doc__ or '').splitlines()[0]
             del sys.modules['__temp__']
-        else: # text modules can be directly examined
+        else:
+            # text modules can be directly examined
             result = source_synopsis(file)
             file.close()
+
         cache[filename] = (mtime, result)
     return result
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 2f11eef..29b2d86 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -23,6 +23,11 @@
 Library
 -------
 
+- Issue #13959: imp.get_suffixes() has been deprecated in favour of the new
+  attributes on importlib.machinery: SOURCE_SUFFIXES, DEBUG_BYTECODE_SUFFIXES,
+  OPTIMIZED_BYTECODE_SUFFIXES, BYTECODE_SUFFIXES, and EXTENSION_SUFFIXES. This
+  led to an indirect deprecation of inspect.getmoduleinfo().
+
 - Issue #14662: Prevent shutil failures on OS X when destination does not
   support chflag operations.  Patch by Hynek Schlawack.