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gh-155726: Restore the sysconfig prefix cache in test_sysconfig #155729

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gh-155726: Restore the sysconfig prefix cache in test_sysconfig #155729

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7 changes: 7 additions & 0 deletions Lib/test/test_sysconfig.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,8 @@ def setUp(self):
self.isabs = os.path.isabs
self.splitdrive = os.path.splitdrive
self._config_vars = sysconfig._CONFIG_VARS, copy(sysconfig._CONFIG_VARS)
self._cached_prefixes = (sysconfig._config_vars_cached_prefix,
sysconfig._config_vars_cached_exec_prefix)
self._added_envvars = []
self._changed_envvars = []
for var in ('MACOSX_DEPLOYMENT_TARGET', 'PATH'):
Expand Down Expand Up @@ -92,6 +94,11 @@ def tearDown(self):
sysconfig._CONFIG_VARS = self._config_vars[0]
sysconfig._CONFIG_VARS.clear()
sysconfig._CONFIG_VARS.update(self._config_vars[1])
# Restoring _CONFIG_VARS is not enough: if the cached prefixes are
# left over from the test, the next get_config_vars() call finds
# the cache stale and replaces _CONFIG_VARS with a new dict.
(sysconfig._config_vars_cached_prefix,
sysconfig._config_vars_cached_exec_prefix) = self._cached_prefixes
for var, value in self._changed_envvars:
os.environ[var] = value
for var in self._added_envvars:
Expand Down
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