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gh-120057: Add os.environ.refresh() method (#120059)
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Lines changed: 124 additions & 4 deletions

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‎Doc/library/os.rst‎

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@@ -193,6 +193,10 @@ process and user.
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to the environment made after this time are not reflected in :data:`os.environ`,
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except for changes made by modifying :data:`os.environ` directly.
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The :meth:`!os.environ.refresh()` method updates :data:`os.environ` with
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changes to the environment made by :func:`os.putenv`, by
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:func:`os.unsetenv`, or made outside Python in the same process.
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This mapping may be used to modify the environment as well as query the
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environment. :func:`putenv` will be called automatically when the mapping
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is modified.
@@ -225,6 +229,9 @@ process and user.
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.. versionchanged:: 3.9
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Updated to support :pep:`584`'s merge (``|``) and update (``|=``) operators.
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.. versionchanged:: 3.14
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Added the :meth:`!os.environ.refresh()` method.
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.. data:: environb
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@@ -561,6 +568,8 @@ process and user.
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of :data:`os.environ`. This also applies to :func:`getenv` and :func:`getenvb`, which
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respectively use :data:`os.environ` and :data:`os.environb` in their implementations.
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See also the :data:`os.environ.refresh() <os.environ>` method.
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.. note::
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On some platforms, including FreeBSD and macOS, setting ``environ`` may
@@ -809,6 +818,8 @@ process and user.
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don't update :data:`os.environ`, so it is actually preferable to delete items of
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:data:`os.environ`.
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See also the :data:`os.environ.refresh() <os.environ>` method.
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.. audit-event:: os.unsetenv key os.unsetenv
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.. versionchanged:: 3.9

‎Doc/whatsnew/3.14.rst‎

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@@ -92,6 +92,13 @@ ast
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Added :func:`ast.compare` for comparing two ASTs.
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(Contributed by Batuhan Taskaya and Jeremy Hylton in :issue:`15987`.)
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os
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--
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* Added the :data:`os.environ.refresh() <os.environ>` method to update
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:data:`os.environ` with changes to the environment made by :func:`os.putenv`,
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by :func:`os.unsetenv`, or made outside Python in the same process.
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(Contributed by Victor Stinner in :gh:`120057`.)
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Optimizations

‎Lib/os.py‎

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@@ -64,6 +64,10 @@ def _get_exports_list(module):
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from posix import _have_functions
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except ImportError:
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pass
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try:
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from posix import _create_environ
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except ImportError:
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pass
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import posix
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__all__.extend(_get_exports_list(posix))
@@ -88,6 +92,10 @@ def _get_exports_list(module):
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from nt import _have_functions
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except ImportError:
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pass
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try:
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from nt import _create_environ
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except ImportError:
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pass
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else:
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raise ImportError('no os specific module found')
@@ -773,7 +781,18 @@ def __ror__(self, other):
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new.update(self)
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return new
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def _createenviron():
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if _exists("_create_environ"):
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def refresh(self):
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data = _create_environ()
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if name == 'nt':
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data = {self.encodekey(key): value
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for key, value in data.items()}
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# modify in-place to keep os.environb in sync
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self._data.clear()
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self._data.update(data)
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def _create_environ_mapping():
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if name == 'nt':
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# Where Env Var Names Must Be UPPERCASE
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def check_str(value):
@@ -803,8 +822,8 @@ def decode(value):
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encode, decode)
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# unicode environ
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environ = _createenviron()
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del _createenviron
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environ = _create_environ_mapping()
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del _create_environ_mapping
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def getenv(key, default=None):

‎Lib/test/test_os.py‎

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@@ -1298,6 +1298,52 @@ def test_ror_operator(self):
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self._test_underlying_process_env('_A_', '')
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self._test_underlying_process_env(overridden_key, original_value)
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def test_refresh(self):
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# Test os.environ.refresh()
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has_environb = hasattr(os, 'environb')
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# Test with putenv() which doesn't update os.environ
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os.environ['test_env'] = 'python_value'
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os.putenv("test_env", "new_value")
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self.assertEqual(os.environ['test_env'], 'python_value')
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if has_environb:
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self.assertEqual(os.environb[b'test_env'], b'python_value')
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os.environ.refresh()
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self.assertEqual(os.environ['test_env'], 'new_value')
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if has_environb:
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self.assertEqual(os.environb[b'test_env'], b'new_value')
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# Test with unsetenv() which doesn't update os.environ
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os.unsetenv('test_env')
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self.assertEqual(os.environ['test_env'], 'new_value')
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if has_environb:
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self.assertEqual(os.environb[b'test_env'], b'new_value')
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os.environ.refresh()
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self.assertNotIn('test_env', os.environ)
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if has_environb:
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self.assertNotIn(b'test_env', os.environb)
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if has_environb:
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# test os.environb.refresh() with putenv()
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os.environb[b'test_env'] = b'python_value2'
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os.putenv("test_env", "new_value2")
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self.assertEqual(os.environb[b'test_env'], b'python_value2')
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self.assertEqual(os.environ['test_env'], 'python_value2')
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os.environb.refresh()
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self.assertEqual(os.environb[b'test_env'], b'new_value2')
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self.assertEqual(os.environ['test_env'], 'new_value2')
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# test os.environb.refresh() with unsetenv()
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os.unsetenv('test_env')
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self.assertEqual(os.environb[b'test_env'], b'new_value2')
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self.assertEqual(os.environ['test_env'], 'new_value2')
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os.environb.refresh()
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self.assertNotIn(b'test_env', os.environb)
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self.assertNotIn('test_env', os.environ)
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class WalkTests(unittest.TestCase):
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"""Tests for os.walk()."""

‎Misc/NEWS.d/next/Library/2024-06-04-18-53-10.gh-issue-120057.RSD9_Z.rst‎

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@@ -0,0 +1,4 @@
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Added the :data:`os.environ.refresh() <os.environ>` method to update
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:data:`os.environ` with changes to the environment made by :func:`os.putenv`,
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by :func:`os.unsetenv`, or made outside Python in the same process.
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Patch by Victor Stinner.

‎Modules/clinic/posixmodule.c.h‎

Lines changed: 19 additions & 1 deletion
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‎Modules/posixmodule.c‎

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@@ -16809,6 +16809,20 @@ os__is_inputhook_installed_impl(PyObject *module)
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return PyBool_FromLong(PyOS_InputHook != NULL);
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}
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/*[clinic input]
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os._create_environ
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Create the environment dictionary.
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[clinic start generated code]*/
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static PyObject *
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os__create_environ_impl(PyObject *module)
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/*[clinic end generated code: output=19d9039ab14f8ad4 input=a4c05686b34635e8]*/
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{
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return convertenviron();
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}
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static PyMethodDef posix_methods[] = {
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OS_STAT_METHODDEF
@@ -17023,6 +17037,7 @@ static PyMethodDef posix_methods[] = {
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OS__SUPPORTS_VIRTUAL_TERMINAL_METHODDEF
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OS__INPUTHOOK_METHODDEF
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OS__IS_INPUTHOOK_INSTALLED_METHODDEF
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OS__CREATE_ENVIRON_METHODDEF
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{NULL, NULL} /* Sentinel */
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};
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