Barry A. Warsaw <[email protected]> added the comment:
I've done a fair bit of testing and it seems rather inconsistent as to whether
either of these work when added right before an explicit call to `os.fork()`:
os.environ['OBJC_DISABLE_INITIALIZE_FORK_SAFETY'] = 'YES'
ctyles.cdll.LoadLibrary('/System/Library/Frameworks/Foundation.framework/Foundation')
Neither of these seems to reliably prevent the __NSPlaceholderDate warning, nor
prevent the core dumps. The best I've been able to do is to prevent them by
setting the environment variable *before* the parent process starts (i.e.
outside of the Python code of the process).
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<https://bugs.python.org/issue35219>
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