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"""Uses the old atexit with added unregister for python 2.x
and the new atexit for python 3.x
"""
import atexit
import sys
__all__ = ["register", "unregister"]
_exithandlers = []
def _run_exitfuncs():
"""run any registered exit functions
_exithandlers is traversed in reverse order so functions are executed
last in, first out.
"""
exc_info = None
while _exithandlers:
func, targs, kargs = _exithandlers.pop()
try:
func(*targs, **kargs)
except SystemExit:
exc_info = sys.exc_info()
except:
import traceback
sys.stderr.write("Error in atexit._run_exitfuncs:\n")
traceback.print_exc()
exc_info = sys.exc_info()
if exc_info is not None:
raise exc_info[0](exc_info[1])
def register(func, *targs, **kargs):
"""register a function to be executed upon normal program termination
func - function to be called at exit
targs - optional arguments to pass to func
kargs - optional keyword arguments to pass to func
func is returned to facilitate usage as a decorator.
"""
if hasattr(atexit, "unregister"):
atexit.register(func, *targs, **kargs)
else:
_exithandlers.append((func, targs, kargs))
return func
def unregister(func):
"""remove func from the list of functions that are registered
doesn't do anything if func is not found
func = function to be unregistered
"""
if hasattr(atexit, "unregister"):
atexit.unregister(func)
else:
handler_entries = [e for e in _exithandlers if e[0] == func]
for e in handler_entries:
_exithandlers.remove(e)
if not hasattr(atexit, "unregister"):
# Only in python 2.x
atexit.register(_run_exitfuncs)
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