diff --git a/Lib/_dummy_thread.py b/Lib/_dummy_thread.py
index 4909d18..13b1f26 100644
--- a/Lib/_dummy_thread.py
+++ b/Lib/_dummy_thread.py
@@ -7,7 +7,7 @@
 
     try:
         import _thread
-    except ModuleNotFoundError:
+    except ImportError:
         import _dummy_thread as _thread
 
 """
diff --git a/Lib/_osx_support.py b/Lib/_osx_support.py
index 19ee3e2..8412e45 100644
--- a/Lib/_osx_support.py
+++ b/Lib/_osx_support.py
@@ -62,7 +62,7 @@
     try:
         import tempfile
         fp = tempfile.NamedTemporaryFile()
-    except ModuleNotFoundError:
+    except ImportError:
         fp = open("/tmp/_osx_support.%s"%(
             os.getpid(),), "w+b")
 
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 79e6df2..137ebcb 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -9,7 +9,7 @@
 # Import _thread instead of threading to reduce startup cost
 try:
     from _thread import allocate_lock as Lock
-except ModuleNotFoundError:
+except ImportError:
     from _dummy_thread import allocate_lock as Lock
 
 import io
@@ -1486,7 +1486,7 @@
             if encoding is None:
                 try:
                     import locale
-                except ModuleNotFoundError:
+                except ImportError:
                     # Importing locale may fail if Python is being built
                     encoding = "ascii"
                 else:
diff --git a/Lib/_strptime.py b/Lib/_strptime.py
index 7724d87..7520919 100644
--- a/Lib/_strptime.py
+++ b/Lib/_strptime.py
@@ -21,7 +21,7 @@
                       timezone as datetime_timezone)
 try:
     from _thread import allocate_lock as _thread_allocate_lock
-except ModuleNotFoundError:
+except ImportError:
     from _dummy_thread import allocate_lock as _thread_allocate_lock
 
 __all__ = []
diff --git a/Lib/bisect.py b/Lib/bisect.py
index 7808651..4a4d052 100644
--- a/Lib/bisect.py
+++ b/Lib/bisect.py
@@ -88,5 +88,5 @@
 # Overwrite above definitions with a fast C implementation
 try:
     from _bisect import *
-except ModuleNotFoundError:
+except ImportError:
     pass
diff --git a/Lib/bz2.py b/Lib/bz2.py
index f42045f..6e6a2b9 100644
--- a/Lib/bz2.py
+++ b/Lib/bz2.py
@@ -14,7 +14,7 @@
 
 try:
     from threading import RLock
-except ModuleNotFoundError:
+except ImportError:
     from dummy_threading import RLock
 
 from _bz2 import BZ2Compressor, BZ2Decompressor
diff --git a/Lib/cmd.py b/Lib/cmd.py
index 58ee5f5..859e910 100644
--- a/Lib/cmd.py
+++ b/Lib/cmd.py
@@ -109,7 +109,7 @@
                 self.old_completer = readline.get_completer()
                 readline.set_completer(self.complete)
                 readline.parse_and_bind(self.completekey+": complete")
-            except ModuleNotFoundError:
+            except ImportError:
                 pass
         try:
             if intro is not None:
@@ -143,7 +143,7 @@
                 try:
                     import readline
                     readline.set_completer(self.old_completer)
-                except ModuleNotFoundError:
+                except ImportError:
                     pass
 
 
diff --git a/Lib/code.py b/Lib/code.py
index a1ac904..9020aab 100644
--- a/Lib/code.py
+++ b/Lib/code.py
@@ -293,7 +293,7 @@
     else:
         try:
             import readline
-        except ModuleNotFoundError:
+        except ImportError:
             pass
     console.interact(banner)
 
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index a8ad916..e1a075c 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -395,7 +395,7 @@
 
 try:                                    # Load C helper function if available
     from _collections import _count_elements
-except ModuleNotFoundError:
+except ImportError:
     pass
 
 class Counter(dict):
diff --git a/Lib/copy.py b/Lib/copy.py
index 2fbffa1..d96201e 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -59,7 +59,7 @@
 
 try:
     from org.python.core import PyStringMap
-except ModuleNotFoundError:
+except ImportError:
     PyStringMap = None
 
 __all__ = ["Error", "copy", "deepcopy"]
diff --git a/Lib/datetime.py b/Lib/datetime.py
index 2883418..bc1486c 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -2116,7 +2116,7 @@
 
 try:
     from _datetime import *
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     # Clean up unused names
diff --git a/Lib/decimal.py b/Lib/decimal.py
index 6c3e19e..d39ac1d 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -149,7 +149,7 @@
 try:
     from collections import namedtuple as _namedtuple
     DecimalTuple = _namedtuple('DecimalTuple', 'sign digits exponent')
-except ModuleNotFoundError:
+except ImportError:
     DecimalTuple = lambda *args: args
 
 # Rounding
@@ -430,7 +430,7 @@
 
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     # Python was compiled without threads; create a mock object instead
     class MockThreading(object):
         def local(self, sys=sys):
@@ -6147,7 +6147,7 @@
 # don't care too much if locale isn't present.
 try:
     import locale as _locale
-except ModuleNotFoundError:
+except ImportError:
     pass
 
 def _parse_format_specifier(format_spec, _localeconv=None):
@@ -6391,7 +6391,7 @@
 
 try:
     import _decimal
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     s1 = set(dir())
diff --git a/Lib/distutils/archive_util.py b/Lib/distutils/archive_util.py
index ba74045..fcda08e 100644
--- a/Lib/distutils/archive_util.py
+++ b/Lib/distutils/archive_util.py
@@ -9,7 +9,7 @@
 
 try:
     import zipfile
-except ModuleNotFoundError:
+except ImportError:
     zipfile = None
 
 
diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index bc183fc..911e84d 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -3,7 +3,7 @@
 Contains CCompiler, an abstract base class that defines the interface
 for the Distutils compiler abstraction model."""
 
-import importlib, sys, os, re
+import sys, os, re
 from distutils.errors import *
 from distutils.spawn import spawn
 from distutils.file_util import move_file
@@ -1013,9 +1013,10 @@
 
     try:
         module_name = "distutils." + module_name
-        module = importlib.import_module(module_name)
+        __import__ (module_name)
+        module = sys.modules[module_name]
         klass = vars(module)[class_name]
-    except ModuleNotFoundError:
+    except ImportError:
         raise DistutilsModuleError(
               "can't compile C/C++ code: unable to load module '%s'" % \
               module_name)
diff --git a/Lib/distutils/dist.py b/Lib/distutils/dist.py
index 11f6ff8..f7fac08 100644
--- a/Lib/distutils/dist.py
+++ b/Lib/distutils/dist.py
@@ -4,11 +4,11 @@
 being built/installed/distributed.
 """
 
-import importlib, sys, os, re
+import sys, os, re
 
 try:
     import warnings
-except ModuleNotFoundError:
+except ImportError:
     warnings = None
 
 from distutils.errors import *
@@ -788,8 +788,9 @@
             klass_name = command
 
             try:
-                module = importlib.import_module(module_name)
-            except ModuleNotFoundError:
+                __import__ (module_name)
+                module = sys.modules[module_name]
+            except ImportError:
                 continue
 
             try:
diff --git a/Lib/distutils/msvccompiler.py b/Lib/distutils/msvccompiler.py
index 9a94b41..8116656 100644
--- a/Lib/distutils/msvccompiler.py
+++ b/Lib/distutils/msvccompiler.py
@@ -28,7 +28,7 @@
     RegEnumValue = winreg.EnumValue
     RegError = winreg.error
 
-except ModuleNotFoundError:
+except ImportError:
     try:
         import win32api
         import win32con
@@ -39,7 +39,7 @@
         RegEnumKey = win32api.RegEnumKey
         RegEnumValue = win32api.RegEnumValue
         RegError = win32api.error
-    except ModuleNotFoundError:
+    except ImportError:
         log.info("Warning: Can't read registry to find the "
                  "necessary compiler setting\n"
                  "Make sure that Python modules winreg, "
diff --git a/Lib/distutils/util.py b/Lib/distutils/util.py
index 257de68..efb3834 100644
--- a/Lib/distutils/util.py
+++ b/Lib/distutils/util.py
@@ -388,7 +388,7 @@
         try:
             from tempfile import mkstemp
             (script_fd, script_name) = mkstemp(".py")
-        except ModuleNotFoundError:
+        except ImportError:
             from tempfile import mktemp
             (script_fd, script_name) = None, mktemp(".py")
         log.info("writing byte-compilation script '%s'", script_name)
diff --git a/Lib/encodings/__init__.py b/Lib/encodings/__init__.py
index 10d881d..8dd7130 100644
--- a/Lib/encodings/__init__.py
+++ b/Lib/encodings/__init__.py
@@ -29,11 +29,11 @@
 """#"
 
 import codecs
-import importlib
 from . import aliases
 
 _cache = {}
 _unknown = '--unknown--'
+_import_tail = ['*']
 _aliases = aliases.aliases
 
 class CodecRegistryError(LookupError, SystemError):
@@ -94,8 +94,9 @@
         try:
             # Import is absolute to prevent the possibly malicious import of a
             # module with side-effects that is not in the 'encodings' package.
-            mod = importlib.import_module('encodings.' + modname)
-        except ModuleNotFoundError:
+            mod = __import__('encodings.' + modname, fromlist=_import_tail,
+                             level=0)
+        except ImportError:
             pass
         else:
             break
diff --git a/Lib/ftplib.py b/Lib/ftplib.py
index bd24a9e..fcd4b14 100644
--- a/Lib/ftplib.py
+++ b/Lib/ftplib.py
@@ -667,7 +667,7 @@
 
 try:
     import ssl
-except ModuleNotFoundError:
+except ImportError:
     _SSLSocket = None
 else:
     _SSLSocket = ssl.SSLSocket
diff --git a/Lib/functools.py b/Lib/functools.py
index 95c1a41..6aa13a2 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -15,7 +15,7 @@
 
 try:
     from _functools import reduce
-except ModuleNotFoundError:
+except ImportError:
     pass
 from abc import get_cache_token
 from collections import namedtuple
@@ -143,7 +143,7 @@
 
 try:
     from _functools import cmp_to_key
-except ModuleNotFoundError:
+except ImportError:
     pass
 
 
@@ -166,7 +166,7 @@
 
 try:
     from _functools import partial
-except ModuleNotFoundError:
+except ImportError:
     pass
 
 
diff --git a/Lib/getopt.py b/Lib/getopt.py
index 9c59dd7..3d6ecbd 100644
--- a/Lib/getopt.py
+++ b/Lib/getopt.py
@@ -36,7 +36,7 @@
 import os
 try:
     from gettext import gettext as _
-except ModuleNotFoundError:
+except ImportError:
     # Bootstrapping Python: gettext's dependencies not built yet
     def _(s): return s
 
diff --git a/Lib/getpass.py b/Lib/getpass.py
index ed9bc59..6ec6c788 100644
--- a/Lib/getpass.py
+++ b/Lib/getpass.py
@@ -164,7 +164,7 @@
 except (ImportError, AttributeError):
     try:
         import msvcrt
-    except ModuleNotFoundError:
+    except ImportError:
         getpass = fallback_getpass
     else:
         getpass = win_getpass
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index c9ef4c9..a1bd8b2 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -98,7 +98,7 @@
                 return _sha3.sha3_384
             elif bs == '512':
                 return _sha3.sha3_512
-    except ModuleNotFoundError:
+    except ImportError:
         pass  # no extension module, this hash is unsupported.
 
     raise ValueError('unsupported hash type ' + name)
@@ -143,7 +143,7 @@
     __get_hash = __get_openssl_constructor
     algorithms_available = algorithms_available.union(
             _hashlib.openssl_md_meth_names)
-except ModuleNotFoundError:
+except ImportError:
     new = __py_new
     __get_hash = __get_builtin_constructor
 
diff --git a/Lib/heapq.py b/Lib/heapq.py
index dfe7a48..00b429c 100644
--- a/Lib/heapq.py
+++ b/Lib/heapq.py
@@ -343,7 +343,7 @@
 # If available, use C implementation
 try:
     from _heapq import *
-except ModuleNotFoundError:
+except ImportError:
     pass
 
 def merge(*iterables):
diff --git a/Lib/http/client.py b/Lib/http/client.py
index 188f4f6..939615b 100644
--- a/Lib/http/client.py
+++ b/Lib/http/client.py
@@ -1156,7 +1156,7 @@
 
 try:
     import ssl
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     class HTTPSConnection(HTTPConnection):
diff --git a/Lib/http/cookiejar.py b/Lib/http/cookiejar.py
index fd40ee0..be828eb 100644
--- a/Lib/http/cookiejar.py
+++ b/Lib/http/cookiejar.py
@@ -35,7 +35,7 @@
 import urllib.parse, urllib.request
 try:
     import threading as _threading
-except ModuleNotFoundError:
+except ImportError:
     import dummy_threading as _threading
 import http.client  # only for the default HTTP port
 from calendar import timegm
diff --git a/Lib/http/server.py b/Lib/http/server.py
index 48e3f97..e47e034 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -904,7 +904,7 @@
         return nobody
     try:
         import pwd
-    except ModuleNotFoundError:
+    except ImportError:
         return -1
     try:
         nobody = pwd.getpwnam('nobody')[2]
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index ce32c80..42353bb 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -29,7 +29,7 @@
 try:
     import ssl
     HAVE_SSL = True
-except ModuleNotFoundError:
+except ImportError:
     HAVE_SSL = False
 
 __all__ = ["IMAP4", "IMAP4_stream", "Internaldate2tuple",
diff --git a/Lib/imp.py b/Lib/imp.py
index 458d370..32e8998 100644
--- a/Lib/imp.py
+++ b/Lib/imp.py
@@ -12,7 +12,7 @@
                   _fix_co_filename)
 try:
     from _imp import load_dynamic
-except ModuleNotFoundError:
+except ImportError:
     # Platform doesn't support dynamic loading.
     load_dynamic = None
 
diff --git a/Lib/importlib/__init__.py b/Lib/importlib/__init__.py
index 83de028..d456c48 100644
--- a/Lib/importlib/__init__.py
+++ b/Lib/importlib/__init__.py
@@ -15,7 +15,7 @@
 
 try:
     import _frozen_importlib as _bootstrap
-except ModuleNotFoundError:
+except ImportError:
     from . import _bootstrap
     _bootstrap._setup(sys, _imp)
 else:
diff --git a/Lib/importlib/abc.py b/Lib/importlib/abc.py
index b53a1a5..082796c 100644
--- a/Lib/importlib/abc.py
+++ b/Lib/importlib/abc.py
@@ -3,7 +3,7 @@
 from . import machinery
 try:
     import _frozen_importlib
-except ModuleNotFoundError as exc:
+except ImportError as exc:
     if exc.name != '_frozen_importlib':
         raise
     _frozen_importlib = None
diff --git a/Lib/inspect.py b/Lib/inspect.py
index d788525..4a28507 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -50,7 +50,7 @@
 # back to hardcording so the dependency is optional
 try:
     from dis import COMPILER_FLAG_NAMES as _flag_names
-except ModuleNotFoundError:
+except ImportError:
     CO_OPTIMIZED, CO_NEWLOCALS = 0x1, 0x2
     CO_VARARGS, CO_VARKEYWORDS = 0x4, 0x8
     CO_NESTED, CO_GENERATOR, CO_NOFREE = 0x10, 0x20, 0x40
diff --git a/Lib/json/decoder.py b/Lib/json/decoder.py
index 4f11354..da7ef9c 100644
--- a/Lib/json/decoder.py
+++ b/Lib/json/decoder.py
@@ -5,7 +5,7 @@
 from json import scanner
 try:
     from _json import scanstring as c_scanstring
-except ModuleNotFoundError:
+except ImportError:
     c_scanstring = None
 
 __all__ = ['JSONDecoder']
diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index 3fa90bd..39b550d 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -4,11 +4,11 @@
 
 try:
     from _json import encode_basestring_ascii as c_encode_basestring_ascii
-except ModuleNotFoundError:
+except ImportError:
     c_encode_basestring_ascii = None
 try:
     from _json import make_encoder as c_make_encoder
-except ModuleNotFoundError:
+except ImportError:
     c_make_encoder = None
 
 ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
diff --git a/Lib/json/scanner.py b/Lib/json/scanner.py
index 761ade3..86426cd 100644
--- a/Lib/json/scanner.py
+++ b/Lib/json/scanner.py
@@ -3,7 +3,7 @@
 import re
 try:
     from _json import make_scanner as c_make_scanner
-except ModuleNotFoundError:
+except ImportError:
     c_make_scanner = None
 
 __all__ = ['make_scanner']
diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index 11a353c..8100317 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -706,7 +706,7 @@
                 items, write, doctests_only)
         try:
             import multiprocessing
-        except ModuleNotFoundError:
+        except ImportError:
             raise MultiprocessingUnsupported
         if self.queue is not None:
             raise RuntimeError("already doing multiple processes")
diff --git a/Lib/locale.py b/Lib/locale.py
index 75ab2ab..d2a885d 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -47,7 +47,7 @@
 
     from _locale import *
 
-except ModuleNotFoundError:
+except ImportError:
 
     # Locale emulation
 
diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index b4552bf..4629860 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -37,7 +37,7 @@
 
 try:
     import threading
-except ModuleNotFoundError: #pragma: no cover
+except ImportError: #pragma: no cover
     threading = None
 
 __author__  = "Vinay Sajip <vinay_sajip@red-dove.com>"
diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index 4354dd1..b882a62 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -30,7 +30,7 @@
 try:
     import _thread as thread
     import threading
-except ModuleNotFoundError: #pragma: no cover
+except ImportError: #pragma: no cover
     thread = None
 
 from socketserver import ThreadingTCPServer, StreamRequestHandler
diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index 0a11b82..f1ddbb5 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -29,7 +29,7 @@
 import queue
 try:
     import threading
-except ModuleNotFoundError: #pragma: no cover
+except ImportError: #pragma: no cover
     threading = None
 
 #
@@ -995,7 +995,7 @@
                 logging.ERROR   : win32evtlog.EVENTLOG_ERROR_TYPE,
                 logging.CRITICAL: win32evtlog.EVENTLOG_ERROR_TYPE,
          }
-        except ModuleNotFoundError:
+        except ImportError:
             print("The Python Win32 extensions for NT (service, event "\
                         "logging) appear not to be available.")
             self._welu = None
diff --git a/Lib/macpath.py b/Lib/macpath.py
index c5af102..d34f9e94 100644
--- a/Lib/macpath.py
+++ b/Lib/macpath.py
@@ -187,7 +187,7 @@
     path = abspath(path)
     try:
         import Carbon.File
-    except ModuleNotFoundError:
+    except ImportError:
         return path
     if not path:
         return path
diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index a45b3bf..2049516 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -23,7 +23,7 @@
 import contextlib
 try:
     import fcntl
-except ModuleNotFoundError:
+except ImportError:
     fcntl = None
 
 __all__ = [ 'Mailbox', 'Maildir', 'mbox', 'MH', 'Babyl', 'MMDF',
diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index a5825cd..5aaa908 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -29,7 +29,7 @@
 import urllib.parse
 try:
     import winreg as _winreg
-except ModuleNotFoundError:
+except ImportError:
     _winreg = None
 
 __all__ = [
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 55f6ba9..1093d9f 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -27,7 +27,7 @@
 try:
     import _winapi
     from _winapi import WAIT_OBJECT_0, WAIT_TIMEOUT, INFINITE
-except ModuleNotFoundError:
+except ImportError:
     if sys.platform == 'win32':
         raise
     _winapi = None
diff --git a/Lib/multiprocessing/forking.py b/Lib/multiprocessing/forking.py
index d06036d..39cfd8d 100644
--- a/Lib/multiprocessing/forking.py
+++ b/Lib/multiprocessing/forking.py
@@ -73,7 +73,7 @@
 
 try:
     from functools import partial
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     def _reduce_partial(p):
diff --git a/Lib/nntplib.py b/Lib/nntplib.py
index 7f26e1c..01d4303 100644
--- a/Lib/nntplib.py
+++ b/Lib/nntplib.py
@@ -71,7 +71,7 @@
 
 try:
     import ssl
-except ModuleNotFoundError:
+except ImportError:
     _have_ssl = False
 else:
     _have_ssl = True
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 4dfea32..d81f728 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -566,7 +566,7 @@
 try:
     from nt import _getfullpathname
 
-except ModuleNotFoundError: # not running on Windows - mock up something sensible
+except ImportError: # not running on Windows - mock up something sensible
     def abspath(path):
         """Return the absolute version of a path."""
         if not isabs(path):
@@ -659,6 +659,6 @@
     # This is overkill on Windows - just pass the path to GetFileAttributes
     # and check the attribute from there.
     from nt import _isdir as isdir
-except ModuleNotFoundError:
+except ImportError:
     # Use genericpath.isdir as imported above.
     pass
diff --git a/Lib/operator.py b/Lib/operator.py
index c8273cc..d31a9a4 100644
--- a/Lib/operator.py
+++ b/Lib/operator.py
@@ -360,7 +360,7 @@
 
 try:
     from _operator import *
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     from _operator import __doc__
diff --git a/Lib/optparse.py b/Lib/optparse.py
index 3812258..37764d3 100644
--- a/Lib/optparse.py
+++ b/Lib/optparse.py
@@ -87,7 +87,7 @@
 
 try:
     from gettext import gettext, ngettext
-except ModuleNotFoundError:
+except ImportError:
     def gettext(message):
         return message
 
diff --git a/Lib/os.py b/Lib/os.py
index 8f568c7..96720e4 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -52,13 +52,13 @@
     try:
         from posix import _exit
         __all__.append('_exit')
-    except ModuleNotFoundError:
+    except ImportError:
         pass
     import posixpath as path
 
     try:
         from posix import _have_functions
-    except ModuleNotFoundError:
+    except ImportError:
         pass
 
 elif 'nt' in _names:
@@ -68,7 +68,7 @@
     try:
         from nt import _exit
         __all__.append('_exit')
-    except ModuleNotFoundError:
+    except ImportError:
         pass
     import ntpath as path
 
@@ -78,7 +78,7 @@
 
     try:
         from nt import _have_functions
-    except ModuleNotFoundError:
+    except ImportError:
         pass
 
 elif 'ce' in _names:
@@ -88,7 +88,7 @@
     try:
         from ce import _exit
         __all__.append('_exit')
-    except ModuleNotFoundError:
+    except ImportError:
         pass
     # We can use the standard Windows path.
     import ntpath as path
@@ -99,11 +99,11 @@
 
     try:
         from ce import _have_functions
-    except ModuleNotFoundError:
+    except ImportError:
         pass
 
 else:
-    raise ModuleNotFoundError('no os specific module found')
+    raise ImportError('no os specific module found')
 
 sys.modules['os.path'] = path
 from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep,
diff --git a/Lib/pdb.py b/Lib/pdb.py
index d964f98..e5596e5 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -158,7 +158,7 @@
             import readline
             # remove some common file name delimiters
             readline.set_completer_delims(' \t\n`@#$%^&*()=+[{]}\\|;:\'",<>?')
-        except ModuleNotFoundError:
+        except ImportError:
             pass
         self.allow_kbdint = False
         self.nosigint = nosigint
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 5d22fce..b3b775f 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -90,7 +90,7 @@
 # Jython has PyStringMap; it's a dict subclass with string keys
 try:
     from org.python.core import PyStringMap
-except ModuleNotFoundError:
+except ImportError:
     PyStringMap = None
 
 # Pickle opcodes.  See pickletools.py for extensive docs.  The listing
@@ -1296,7 +1296,7 @@
 # Use the faster _pickle if possible
 try:
     from _pickle import *
-except ModuleNotFoundError:
+except ImportError:
     Pickler, Unpickler = _Pickler, _Unpickler
 
 # Doctest
diff --git a/Lib/platform.py b/Lib/platform.py
index 5951efb..c54f768 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -460,7 +460,7 @@
     try:
         # Use win32api if available
         from win32api import RegQueryValueEx
-    except ModuleNotFoundError:
+    except ImportError:
         # On Python 2.0 and later, emulate using winreg
         import winreg
         RegQueryValueEx = winreg.QueryValueEx
@@ -503,7 +503,7 @@
              RegCloseKey, GetVersionEx
         from win32con import HKEY_LOCAL_MACHINE, VER_PLATFORM_WIN32_NT, \
              VER_PLATFORM_WIN32_WINDOWS, VER_NT_WORKSTATION
-    except ModuleNotFoundError:
+    except ImportError:
         # Emulate the win32api module using Python APIs
         try:
             sys.getwindowsversion
@@ -661,7 +661,7 @@
     # Check whether the version info module is available
     try:
         import _gestalt
-    except ModuleNotFoundError:
+    except ImportError:
         return None
     # Get the infos
     sysv, sysa = _mac_ver_lookup(('sysv','sysa'))
@@ -697,7 +697,7 @@
 
     try:
         import plistlib
-    except ModuleNotFoundError:
+    except ImportError:
         return None
 
     pl = plistlib.readPlist(fn)
@@ -762,7 +762,7 @@
     # Import the needed APIs
     try:
         import java.lang
-    except ModuleNotFoundError:
+    except ImportError:
         return release,vendor,vminfo,osinfo
 
     vendor = _java_getprop('java.vendor', vendor)
@@ -874,7 +874,7 @@
     """
     try:
         import socket
-    except ModuleNotFoundError:
+    except ImportError:
         # No sockets...
         return default
     try:
@@ -1138,7 +1138,7 @@
         # Get processor information
         try:
             import vms_lib
-        except ModuleNotFoundError:
+        except ImportError:
             pass
         else:
             csid, cpu_number = vms_lib.getsyi('SYI$_CPU',0)
diff --git a/Lib/poplib.py b/Lib/poplib.py
index 5d62ba4..0f12ae2 100644
--- a/Lib/poplib.py
+++ b/Lib/poplib.py
@@ -20,7 +20,7 @@
 try:
     import ssl
     HAVE_SSL = True
-except ModuleNotFoundError:
+except ImportError:
     HAVE_SSL = False
 
 __all__ = ["POP3","error_proto"]
diff --git a/Lib/pstats.py b/Lib/pstats.py
index 5e5dcae..e1ec355 100644
--- a/Lib/pstats.py
+++ b/Lib/pstats.py
@@ -528,7 +528,7 @@
     import cmd
     try:
         import readline
-    except ModuleNotFoundError:
+    except ImportError:
         pass
 
     class ProfileBrowser(cmd.Cmd):
diff --git a/Lib/pty.py b/Lib/pty.py
index 605aeee..e841f12 100644
--- a/Lib/pty.py
+++ b/Lib/pty.py
@@ -67,7 +67,7 @@
     result = os.open(tty_name, os.O_RDWR)
     try:
         from fcntl import ioctl, I_PUSH
-    except ModuleNotFoundError:
+    except ImportError:
         return result
     try:
         ioctl(result, I_PUSH, "ptem")
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 9cc3126..61d5165 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1892,7 +1892,7 @@
     def showtopic(self, topic, more_xrefs=''):
         try:
             import pydoc_data.topics
-        except ModuleNotFoundError:
+        except ImportError:
             self.output.write('''
 Sorry, topic and keyword documentation is not available because the
 module "pydoc_data.topics" could not be found.
@@ -1932,7 +1932,7 @@
         """
         try:
             import pydoc_data.topics
-        except ModuleNotFoundError:
+        except ImportError:
             return('''
 Sorry, topic and keyword documentation is not available because the
 module "pydoc_data.topics" could not be found.
diff --git a/Lib/queue.py b/Lib/queue.py
index 99cb5b9..c3296fe 100644
--- a/Lib/queue.py
+++ b/Lib/queue.py
@@ -2,13 +2,13 @@
 
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     import dummy_threading as threading
 from collections import deque
 from heapq import heappush, heappop
 try:
     from time import monotonic as time
-except ModuleNotFoundError:
+except ImportError:
     from time import time
 
 __all__ = ['Empty', 'Full', 'Queue', 'PriorityQueue', 'LifoQueue']
diff --git a/Lib/quopri.py b/Lib/quopri.py
index 63afc1d..e5bd010 100755
--- a/Lib/quopri.py
+++ b/Lib/quopri.py
@@ -13,7 +13,7 @@
 
 try:
     from binascii import a2b_qp, b2a_qp
-except ModuleNotFoundError:
+except ImportError:
     a2b_qp = None
     b2a_qp = None
 
diff --git a/Lib/reprlib.py b/Lib/reprlib.py
index 81005f1..f803360 100644
--- a/Lib/reprlib.py
+++ b/Lib/reprlib.py
@@ -6,7 +6,7 @@
 from itertools import islice
 try:
     from _thread import get_ident
-except ModuleNotFoundError:
+except ImportError:
     from _dummy_thread import get_ident
 
 def recursive_repr(fillvalue='...'):
diff --git a/Lib/rlcompleter.py b/Lib/rlcompleter.py
index 4de0c88..d3a4437 100644
--- a/Lib/rlcompleter.py
+++ b/Lib/rlcompleter.py
@@ -154,7 +154,7 @@
 
 try:
     import readline
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     readline.set_completer(Completer().complete)
diff --git a/Lib/sched.py b/Lib/sched.py
index 14f6fff..9a82a89 100644
--- a/Lib/sched.py
+++ b/Lib/sched.py
@@ -33,11 +33,11 @@
 from collections import namedtuple
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     import dummy_threading as threading
 try:
     from time import monotonic as _time
-except ModuleNotFoundError:
+except ImportError:
     from time import time as _time
 
 __all__ = ["scheduler"]
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 9d1a466..6879d8b 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -17,17 +17,17 @@
     import bz2
     del bz2
     _BZ2_SUPPORTED = True
-except ModuleNotFoundError:
+except ImportError:
     _BZ2_SUPPORTED = False
 
 try:
     from pwd import getpwnam
-except ModuleNotFoundError:
+except ImportError:
     getpwnam = None
 
 try:
     from grp import getgrnam
-except ModuleNotFoundError:
+except ImportError:
     getgrnam = None
 
 __all__ = ["copyfileobj", "copyfile", "copymode", "copystat", "copy", "copy2",
@@ -668,7 +668,7 @@
     # command.
     try:
         import zipfile
-    except ModuleNotFoundError:
+    except ImportError:
         zipfile = None
 
     if zipfile is None:
@@ -858,7 +858,7 @@
     """
     try:
         import zipfile
-    except ModuleNotFoundError:
+    except ImportError:
         raise ReadError('zlib not supported, cannot unpack this archive.')
 
     if not zipfile.is_zipfile(filename):
diff --git a/Lib/site.py b/Lib/site.py
index a1f94f7..96a4bef 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -469,7 +469,7 @@
         try:
             import readline
             import rlcompleter
-        except ModuleNotFoundError:
+        except ImportError:
             return
 
         # Reading the initialization (config) file may not be enough to set a
@@ -570,7 +570,7 @@
     """Run custom site specific code, if available."""
     try:
         import sitecustomize
-    except ModuleNotFoundError:
+    except ImportError:
         pass
     except Exception as err:
         if os.environ.get("PYTHONVERBOSE"):
@@ -586,7 +586,7 @@
     """Run custom user specific code, if available."""
     try:
         import usercustomize
-    except ModuleNotFoundError:
+    except ImportError:
         pass
     except Exception as err:
         if os.environ.get("PYTHONVERBOSE"):
diff --git a/Lib/smtpd.py b/Lib/smtpd.py
index 457cef6..f28036a 100755
--- a/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@ -846,7 +846,7 @@
     if options.setuid:
         try:
             import pwd
-        except ModuleNotFoundError:
+        except ImportError:
             print('Cannot import module "pwd"; try running with -n option.', file=sys.stderr)
             sys.exit(1)
         nobody = pwd.getpwnam('nobody')[2]
diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 80dd468..e1a32ed 100644
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -171,7 +171,7 @@
 
 try:
     import ssl
-except ModuleNotFoundError:
+except ImportError:
     _have_ssl = False
 else:
     _have_ssl = True
diff --git a/Lib/socket.py b/Lib/socket.py
index db28b4b..96f8ed0 100644
--- a/Lib/socket.py
+++ b/Lib/socket.py
@@ -51,7 +51,7 @@
 
 try:
     import errno
-except ModuleNotFoundError:
+except ImportError:
     errno = None
 EBADF = getattr(errno, 'EBADF', 9)
 EAGAIN = getattr(errno, 'EAGAIN', 11)
diff --git a/Lib/socketserver.py b/Lib/socketserver.py
index a6ee718..e9e4e4e 100644
--- a/Lib/socketserver.py
+++ b/Lib/socketserver.py
@@ -136,7 +136,7 @@
 import errno
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     import dummy_threading as threading
 
 __all__ = ["TCPServer","UDPServer","ForkingUDPServer","ForkingTCPServer",
diff --git a/Lib/sqlite3/test/dbapi.py b/Lib/sqlite3/test/dbapi.py
index b728cb3..04649fc 100644
--- a/Lib/sqlite3/test/dbapi.py
+++ b/Lib/sqlite3/test/dbapi.py
@@ -25,7 +25,7 @@
 import sqlite3 as sqlite
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     threading = None
 
 from test.support import TESTFN, unlink
diff --git a/Lib/sqlite3/test/types.py b/Lib/sqlite3/test/types.py
index 9a1d463..3b4cb6d 100644
--- a/Lib/sqlite3/test/types.py
+++ b/Lib/sqlite3/test/types.py
@@ -26,7 +26,7 @@
 import sqlite3 as sqlite
 try:
     import zlib
-except ModuleNotFoundError:
+except ImportError:
     zlib = None
 
 
diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index ed84444..ea6e6be 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -295,7 +295,7 @@
 def _optimize_unicode(charset, fixup):
     try:
         import array
-    except ModuleNotFoundError:
+    except ImportError:
         return charset
     charmap = [0]*65536
     negate = 0
diff --git a/Lib/ssl.py b/Lib/ssl.py
index 5177ae7..d78d96d 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -127,14 +127,14 @@
 try:
     from _ssl import PROTOCOL_SSLv2
     _SSLv2_IF_EXISTS = PROTOCOL_SSLv2
-except ModuleNotFoundError:
+except ImportError:
     _SSLv2_IF_EXISTS = None
 else:
     _PROTOCOL_NAMES[PROTOCOL_SSLv2] = "SSLv2"
 
 try:
     from _ssl import PROTOCOL_TLSv1_1, PROTOCOL_TLSv1_2
-except ModuleNotFoundError:
+except ImportError:
     pass
 else:
     _PROTOCOL_NAMES[PROTOCOL_TLSv1_1] = "TLSv1.1"
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index f81e676..d299f04 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -353,7 +353,7 @@
 import errno
 try:
     from time import monotonic as _time
-except ModuleNotFoundError:
+except ImportError:
     from time import time as _time
 
 # Exception classes used by this module.
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 289aefd..06df7df 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -50,7 +50,7 @@
 
 try:
     import grp, pwd
-except ModuleNotFoundError:
+except ImportError:
     grp = pwd = None
 
 # os.symlink on Windows prior to 6.0 raises NotImplementedError
@@ -381,7 +381,7 @@
             if comptype == "gz":
                 try:
                     import zlib
-                except ModuleNotFoundError:
+                except ImportError:
                     raise CompressionError("zlib module is not available")
                 self.zlib = zlib
                 self.crc = zlib.crc32(b"")
@@ -394,7 +394,7 @@
             elif comptype == "bz2":
                 try:
                     import bz2
-                except ModuleNotFoundError:
+                except ImportError:
                     raise CompressionError("bz2 module is not available")
                 if mode == "r":
                     self.dbuf = b""
@@ -406,7 +406,7 @@
             elif comptype == "xz":
                 try:
                     import lzma
-                except ModuleNotFoundError:
+                except ImportError:
                     raise CompressionError("lzma module is not available")
                 if mode == "r":
                     self.dbuf = b""
@@ -1654,7 +1654,7 @@
 
         try:
             import bz2
-        except ModuleNotFoundError:
+        except ImportError:
             raise CompressionError("bz2 module is not available")
 
         fileobj = bz2.BZ2File(fileobj or name, mode,
@@ -1678,7 +1678,7 @@
 
         try:
             import lzma
-        except ModuleNotFoundError:
+        except ImportError:
             raise CompressionError("lzma module is not available")
 
         fileobj = lzma.LZMAFile(fileobj or name, mode, preset=preset)
diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index f2c3ccc..10b6a1b 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -36,7 +36,7 @@
 
 try:
     import fcntl as _fcntl
-except ModuleNotFoundError:
+except ImportError:
     def _set_cloexec(fd):
         pass
 else:
@@ -53,7 +53,7 @@
 
 try:
     import _thread
-except ModuleNotFoundError:
+except ImportError:
     import _dummy_thread as _thread
 _allocate_lock = _thread.allocate_lock
 
diff --git a/Lib/threading.py b/Lib/threading.py
index 90612e5..3526894 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -6,14 +6,14 @@
 from time import sleep as _sleep
 try:
     from time import monotonic as _time
-except ModuleNotFoundError:
+except ImportError:
     from time import time as _time
 from traceback import format_exc as _format_exc
 from _weakrefset import WeakSet
 from itertools import islice as _islice
 try:
     from _collections import deque as _deque
-except ModuleNotFoundError:
+except ImportError:
     from collections import deque as _deque
 
 # Note regarding PEP 8 compliant names
@@ -922,7 +922,7 @@
 
 try:
     from _thread import _local as local
-except ModuleNotFoundError:
+except ImportError:
     from _threading_local import local
 
 
diff --git a/Lib/trace.py b/Lib/trace.py
index dc72b8c..09fe9ee 100644
--- a/Lib/trace.py
+++ b/Lib/trace.py
@@ -61,12 +61,12 @@
 from warnings import warn as _warn
 try:
     from time import monotonic as _time
-except ModuleNotFoundError:
+except ImportError:
     from time import time as _time
 
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     _settrace = sys.settrace
 
     def _unsettrace():
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index d54b974..4765a94 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -110,7 +110,7 @@
 # check for SSL
 try:
     import ssl
-except ModuleNotFoundError:
+except ImportError:
     _have_ssl = False
 else:
     _have_ssl = True
@@ -2512,7 +2512,7 @@
         proxies = {}
         try:
             import winreg
-        except ModuleNotFoundError:
+        except ImportError:
             # Std module, so should be around - but you never know!
             return proxies
         try:
@@ -2560,7 +2560,7 @@
     def proxy_bypass_registry(host):
         try:
             import winreg
-        except ModuleNotFoundError:
+        except ImportError:
             # Std modules, so should be around - but you never know!
             return 0
         try:
diff --git a/Lib/venv/__init__.py b/Lib/venv/__init__.py
index 102c8d3..ecdb68e 100644
--- a/Lib/venv/__init__.py
+++ b/Lib/venv/__init__.py
@@ -35,7 +35,7 @@
 import sysconfig
 try:
     import threading
-except ModuleNotFoundError:
+except ImportError:
     threading = None
 
 logger = logging.getLogger(__name__)
diff --git a/Lib/warnings.py b/Lib/warnings.py
index 3822361..b05a08e 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -144,8 +144,8 @@
         module = category[:i]
         klass = category[i+1:]
         try:
-            m = __import__(module, fromlist[klass])
-        except ModuleNotFoundError:
+            m = __import__(module, None, None, [klass])
+        except ImportError:
             raise _OptionError("invalid module name: %r" % (module,))
         try:
             cat = getattr(m, klass)
@@ -362,7 +362,7 @@
     defaultaction = _defaultaction
     onceregistry = _onceregistry
     _warnings_defaults = True
-except ModuleNotFoundError:
+except ImportError:
     filters = []
     defaultaction = "default"
     onceregistry = {}
diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index 9c129d8..edf2581 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -1439,13 +1439,13 @@
     def __init__(self, html=0, target=None, encoding=None):
         try:
             from xml.parsers import expat
-        except ModuleNotFoundError:
+        except ImportError:
             try:
                 import pyexpat as expat
-            except ModuleNotFoundError:
-                raise ModuleNotFoundError(
-                    "No module named expat; use SimpleXMLTreeBuilder instead",
-                    name='expat')
+            except ImportError:
+                raise ImportError(
+                    "No module named expat; use SimpleXMLTreeBuilder instead"
+                    )
         parser = expat.ParserCreate(encoding, "}")
         if target is None:
             target = TreeBuilder()
diff --git a/Lib/xml/sax/expatreader.py b/Lib/xml/sax/expatreader.py
index 8619747..a227cda 100644
--- a/Lib/xml/sax/expatreader.py
+++ b/Lib/xml/sax/expatreader.py
@@ -20,7 +20,7 @@
 
 try:
     from xml.parsers import expat
-except ModuleNotFoundError:
+except ImportError:
     raise SAXReaderNotAvailable("expat not supported", None)
 else:
     if not hasattr(expat, "ParserCreate"):
@@ -30,7 +30,18 @@
 AttributesImpl = xmlreader.AttributesImpl
 AttributesNSImpl = xmlreader.AttributesNSImpl
 
-import weakref
+# If we're using a sufficiently recent version of Python, we can use
+# weak references to avoid cycles between the parser and content
+# handler, otherwise we'll just have to pretend.
+try:
+    import _weakref
+except ImportError:
+    def _mkproxy(o):
+        return o
+else:
+    import weakref
+    _mkproxy = weakref.proxy
+    del weakref, _weakref
 
 # --- ExpatLocator
 
@@ -41,7 +52,7 @@
     a circular reference between the parser and the content handler.
     """
     def __init__(self, parser):
-        self._ref = weakref.proxy(parser)
+        self._ref = _mkproxy(parser)
 
     def getColumnNumber(self):
         parser = self._ref
diff --git a/Lib/xmlrpc/client.py b/Lib/xmlrpc/client.py
index 55546e4..ff42265 100644
--- a/Lib/xmlrpc/client.py
+++ b/Lib/xmlrpc/client.py
@@ -139,7 +139,7 @@
 from io import BytesIO
 try:
     import gzip
-except ModuleNotFoundError:
+except ImportError:
     gzip = None #python can be built without zlib/gzip support
 
 # --------------------------------------------------------------------