[Python-checkins] bpo-37173: Show passed class in inspect.getfile error (GH-13861)

[Miss Islington (bot)]

https://github.com/python/cpython/commit/c5daae4ef6d09269c95ed1023e76932cc179f309
commit: c5daae4ef6d09269c95ed1023e76932cc179f309
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2019-06-08T05:24:59-07:00
summary:

bpo-37173: Show passed class in inspect.getfile error (GH-13861)


Currently, inspect.getfile(str) will report nonsense:

```pytb
>>> inspect.getfile(str)
TypeError: <module 'builtins' (built-in)> is a built-in class
```

This fixes that

https://bugs.python.org/issue37173
(cherry picked from commit d407d2a7265f6102e51a1d62b3fd28b4f7a78d16)

Co-authored-by: Philipp A <flying-sheep at web.de>

files:
A Misc/NEWS.d/next/Library/2019-06-08-11-33-48.bpo-37173.0e_8gS.rst
M Lib/inspect.py
M Lib/test/test_inspect.py

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 91d209dc64bc..99a580bd2f23 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -659,9 +659,9 @@ def getfile(object):
         raise TypeError('{!r} is a built-in module'.format(object))
     if isclass(object):
         if hasattr(object, '__module__'):
-            object = sys.modules.get(object.__module__)
-            if getattr(object, '__file__', None):
-                return object.__file__
+            module = sys.modules.get(object.__module__)
+            if getattr(module, '__file__', None):
+                return module.__file__
         raise TypeError('{!r} is a built-in class'.format(object))
     if ismethod(object):
         object = object.__func__
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 83a5f7ec1f53..1cd4ea28939d 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -513,6 +513,24 @@ def test_getsourcefile(self):
     def test_getfile(self):
         self.assertEqual(inspect.getfile(mod.StupidGit), mod.__file__)
 
+    def test_getfile_builtin_module(self):
+        with self.assertRaises(TypeError) as e:
+            inspect.getfile(sys)
+        self.assertTrue(str(e.exception).startswith('<module'))
+
+    def test_getfile_builtin_class(self):
+        with self.assertRaises(TypeError) as e:
+            inspect.getfile(int)
+        self.assertTrue(str(e.exception).startswith('<class'))
+
+    def test_getfile_builtin_function_or_method(self):
+        with self.assertRaises(TypeError) as e_abs:
+            inspect.getfile(abs)
+        self.assertIn('expected, got', str(e_abs.exception))
+        with self.assertRaises(TypeError) as e_append:
+            inspect.getfile(list.append)
+        self.assertIn('expected, got', str(e_append.exception))
+
     def test_getfile_class_without_module(self):
         class CM(type):
             @property
diff --git a/Misc/NEWS.d/next/Library/2019-06-08-11-33-48.bpo-37173.0e_8gS.rst b/Misc/NEWS.d/next/Library/2019-06-08-11-33-48.bpo-37173.0e_8gS.rst
new file mode 100644
index 000000000000..e996f97ecddd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-06-08-11-33-48.bpo-37173.0e_8gS.rst
@@ -0,0 +1 @@
+The exception message for ``inspect.getfile()`` now correctly reports the passed class rather than the builtins module.
\ No newline at end of file