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Adapt to removed stdlib APIs in Python 3.12. #2170

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merged 4 commits into from
Jul 5, 2023
Merged

Adapt to removed stdlib APIs in Python 3.12. #2170

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553fa55
Adapt to removed stdlib APIs in Python 3.12.
jsirois Jul 5, 2023
8644bdc
Flip the import order to favor Python 3.4+.
jsirois Jul 5, 2023
df31915
Merge remote-tracking branch 'refs/remotes/upstream/main' into python…
jsirois Jul 5, 2023
b733fd2
Feedback prompted simplification.
jsirois Jul 5, 2023
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6 changes: 4 additions & 2 deletions pex/pex_builder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -119,10 +119,12 @@ def __entry_point_from_filename__(filename):
if '__file__' in locals() and __file__ is not None and os.path.exists(__file__):
__entry_point__ = __entry_point_from_filename__(__file__)
elif '__loader__' in locals():
from pkgutil import ImpLoader
if hasattr(__loader__, 'archive'):
__entry_point__ = __loader__.archive
elif isinstance(__loader__, ImpLoader):
elif hasattr(__loader__, 'get_filename'):
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Although it's still true Pex contains vendored code that uses ImpLoader (inside Pip), this adjustment as well as the support for find_spec / PEP-451 below is enough to close #2137.

# The source of the loader interface has changed over the course of Python history from
# `pkgutil.ImpLoader` to `importlib.abc.Loader`, but the existence and semantics of
# `get_filename` has remained constant; so we just check for the method.
__entry_point__ = __entry_point_from_filename__(__loader__.get_filename())

if __entry_point__ is None:
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11 changes: 10 additions & 1 deletion pex/third_party/__init__.py
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Expand Up @@ -364,7 +364,16 @@ def uninstall(self):
loader.unload()
_tracer().log("Uninstalled {}".format(self), V=3)

# The PEP-302 finder API.
def find_spec(self, fullname, path, target=None):
# Python 2.7 does not know about this API and does not use it.
from importlib.util import spec_from_loader # type: ignore[import]

loader = self.find_module(fullname, path)
if loader:
return spec_from_loader(fullname, loader)
return None

# The Legacy PEP-302 finder API.
# See: https://www.python.org/dev/peps/pep-0302/#specification-part-1-the-importer-protocol
def find_module(self, fullname, path=None):
for importable in self._importables:
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