circuitpython/tests/misc/sys_atexit.py

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# test sys.atexit() function
import usys
try:
usys.atexit
except AttributeError:
print("SKIP")
raise SystemExit
some_var = None
def do_at_exit():
print("done at exit:", some_var)
usys.atexit(do_at_exit)
some_var = "ok"
print("done before exit")