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Fix pywin32_bootstrap.py to handle early initialization environments #2596

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Fix pywin32_bootstrap.py to handle early initialization environments #2596

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03cd054
Fix pywin32_bootstrap.py to handle early initialization environments
Devel-Dan May 2, 2025
3c35b48
Update win32/Lib/pywin32_bootstrap.py
Devel-Dan May 4, 2025
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18 changes: 16 additions & 2 deletions win32/Lib/pywin32_bootstrap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@

try:
import pywin32_system32
except ImportError: # Python ≥3.6: replace ImportError with ModuleNotFoundError
except ImportError:
pass
else:
import os
Expand All @@ -17,5 +17,19 @@
# https://docs.python.org/3/reference/import.html#path-attributes-on-modules
for path in pywin32_system32.__path__:
if os.path.isdir(path):
os.add_dll_directory(path)
# First try the preferred method
if hasattr(os, "add_dll_directory"):
os.add_dll_directory(path)
# If `add_dll_directory` is missing, which can happen in Pylance early initialization,
# try to modify PATH if it exists (just create it if it doesn't)
elif "PATH" not in os.environ:
os.environ["PATH"] = path
else:
# This is to ensure the pywin32 path is in the beginning to find the
# pywin32 DLLs first and prevent other PATH entries to shadow them
prepend_to_path = path + os.pathsep
if not os.environ["PATH"].startswith(prepend_to_path):
os.environ["PATH"] = prepend_to_path + os.environ["PATH"].replace(
os.pathsep + path, ""
)
break