os: Include posix functions in os.__all__. Closes issue python#18554.

Patch by Ronald Oussoren.

Lib/os.py

@@ -61,6 +61,10 @@ def _get_exports_list(module):
     except ImportError:
         pass
 
+    import posix
+    __all__.extend(_get_exports_list(posix))
+    del posix
+
 elif 'nt' in _names:
     name = 'nt'
     linesep = '\r\n'

Lib/test/test_os.py

@@ -2616,6 +2616,13 @@ def test_blocking(self):
         self.assertEqual(os.get_blocking(fd), True)
 
 
+
+class ExportsTests(unittest.TestCase):
+    def test_os_all(self):
+        self.assertIn('open', os.__all__)
+        self.assertIn('walk', os.__all__)
+
+
 @support.reap_threads
 def test_main():
     support.run_unittest(
@@ -2652,6 +2659,7 @@ def test_main():
         FDInheritanceTests,
         Win32JunctionTests,
         BlockingTests,
+        ExportsTests,
     )
 
 if __name__ == "__main__":

Misc/NEWS

@@ -10,6 +10,8 @@ Release date: TBA
 Core and Builtins
 -----------------
 
+- Issue #18554: os.__all__ includes posix functions.
+
 - Issue #21391: Use os.path.abspath in the shutil module.
 
 - Issue #11471: avoid generating a JUMP_FORWARD instruction at the end of