llvm-project

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# On macOS, system python binaries like /usr/bin/python and $(xcrun -f python3)
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# are shims. They do some light validation work and then spawn the "real" python
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# binary. Find the "real" python by asking dyld -- sys.executable reports the
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# wrong thing more often than not. This is also useful when we're running under
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# a Homebrew python3 binary, which also appears to be some kind of shim.
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def getDarwinRealPythonExecutable():
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    import ctypes
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    dyld = ctypes.cdll.LoadLibrary("/usr/lib/system/libdyld.dylib")
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    namelen = ctypes.c_ulong(1024)
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    name = ctypes.create_string_buffer(b"\000", namelen.value)
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    dyld._NSGetExecutablePath(ctypes.byref(name), ctypes.byref(namelen))
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    return name.value.decode("utf-8").strip()
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print(getDarwinRealPythonExecutable())
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