Xavier de Gaye added the comment:
The following code shows that the trace function is removed when an alarm
raises an exception and prints: 'trace function: None'
import sys, signal, time
def trace(frame, event, arg):
if frame.f_code.co_name == 'foo':
while 1:
time.sleep(.02)
return trace
def foo(): pass
def handler(*args):
1/0
sys.settrace(trace)
signal.signal(signal.SIGALRM, handler)
signal.alarm(1)
try:
foo()
except ZeroDivisionError:
pass
print('trace function:', sys.gettrace())
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<http://bugs.python.org/issue20601>
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