1# On macOS, system python binaries like /usr/bin/python and $(xcrun -f python3)
2# are shims. They do some light validation work and then spawn the "real" python
3# binary. Find the "real" python by asking dyld -- sys.executable reports the
4# wrong thing more often than not. This is also useful when we're running under
5# a Homebrew python3 binary, which also appears to be some kind of shim.
6def getDarwinRealPythonExecutable():
7    import ctypes
8    dyld = ctypes.cdll.LoadLibrary('/usr/lib/system/libdyld.dylib')
9    namelen = ctypes.c_ulong(1024)
10    name = ctypes.create_string_buffer(b'\000', namelen.value)
11    dyld._NSGetExecutablePath(ctypes.byref(name), ctypes.byref(namelen))
12    return name.value.decode('utf-8').strip()
13
14print(getDarwinRealPythonExecutable())
15