Issue #15767: Add ModuleNotFoundError.

3 files changed, 16 insertions, 0 deletions

diff --git a/Lib/_compat_pickle.py b/Lib/_compat_pickle.py
index c0e0443..f68496a 100644
--- a/Lib/_compat_pickle.py
+++ b/Lib/_compat_pickle.py
@@ -242,3 +242,10 @@ PYTHON3_OSERROR_EXCEPTIONS = (
 
 for excname in PYTHON3_OSERROR_EXCEPTIONS:
     REVERSE_NAME_MAPPING[('builtins', excname)] = ('exceptions', 'OSError')
+
+PYTHON3_IMPORTERROR_EXCEPTIONS = (
+    'ModuleNotFoundError',
+)
+
+for excname in PYTHON3_IMPORTERROR_EXCEPTIONS:
+    REVERSE_NAME_MAPPING[('builtins', excname)] = ('exceptions', 'ImportError')
diff --git a/Lib/test/exception_hierarchy.txt b/Lib/test/exception_hierarchy.txt
index 0513765..7333b2a 100644
--- a/Lib/test/exception_hierarchy.txt
+++ b/Lib/test/exception_hierarchy.txt
@@ -14,6 +14,7 @@ BaseException
       +-- BufferError
       +-- EOFError
       +-- ImportError
+           +-- ModuleNotFoundError
       +-- LookupError
       |    +-- IndexError
       |    +-- KeyError
diff --git a/Lib/test/test_pickle.py b/Lib/test/test_pickle.py
index 05203e5..e6c5d08 100644
--- a/Lib/test/test_pickle.py
+++ b/Lib/test/test_pickle.py
@@ -335,6 +335,9 @@ class CompatPickleTests(unittest.TestCase):
                 if (module2, name2) == ('exceptions', 'OSError'):
                     attr = getattribute(module3, name3)
                     self.assertTrue(issubclass(attr, OSError))
+                elif (module2, name2) == ('exceptions', 'ImportError'):
+                    attr = getattribute(module3, name3)
+                    self.assertTrue(issubclass(attr, ImportError))
                 else:
                     module, name = mapping(module2, name2)
                     if module3[:1] != '_':
@@ -401,6 +404,11 @@ class CompatPickleTests(unittest.TestCase):
                 if exc is not OSError and issubclass(exc, OSError):
                     self.assertEqual(reverse_mapping('builtins', name),
                                      ('exceptions', 'OSError'))
+                elif exc is not ImportError and issubclass(exc, ImportError):
+                    self.assertEqual(reverse_mapping('builtins', name),
+                                     ('exceptions', 'ImportError'))
+                    self.assertEqual(mapping('exceptions', name),
+                                     ('exceptions', name))
                 else:
                     self.assertEqual(reverse_mapping('builtins', name),
                                      ('exceptions', name))