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#!/usr/bin/env python3
# On macOS, system python binaries like /usr/bin/python and $(xcrun -f python3)
# are shims. They do some light validation work and then spawn the "real" python
# binary. Find the "real" python by asking dyld -- sys.executable reports the
# wrong thing more often than not. This is also useful when we're running under
# a Homebrew python3 binary, which also appears to be some kind of shim.
# (Taken from https://reviews.llvm.org/D79607)
import ctypes
dyld = ctypes.cdll.LoadLibrary('/usr/lib/system/libdyld.dylib')
namelen = ctypes.c_ulong(1024)
name = ctypes.create_string_buffer(b'\000', namelen.value)
dyld._NSGetExecutablePath(ctypes.byref(name), ctypes.byref(namelen))
print(name.value.decode('utf8').strip())
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