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Hi, 
in the code given below, the last assert fails
when running with 
/mingw64/bin/python3 (Python 3.7.0 -- mingw64's python3 from msys2 project)
C:\Python36\python.exe (Python 3.6.6 -- windows installer)
It does not fail when running with
/usr/bin/python3 (Python 3.6.6 -- msys's python3 from msys2 project)
import sched, time, threading
class A(threading.Thread):
 def __init__(self, sched):
 threading.Thread.__init__(self)
 self._sched = sched
 self.start()
 def run(self):
 self._sched.run()
s = sched.scheduler(time.monotonic, time.sleep)
ev1=None
def go1(a=''):
 print(a)
 global ev1
 ev1 = s.enterabs(time.monotonic()+1, 1, go1, argument=('a',))
ev2=None 
def go2(a=''):
 print(a)
 global ev2
 ev2 = s.enterabs(time.monotonic()+1, 1, go2, argument=('b',))
ev1 = s.enterabs(time.monotonic()+1, 1, go1, argument=('a',))
ev2 = s.enterabs(time.monotonic()+1, 1, go2, argument=('b',))
a = A(s)
time.sleep(2.5)
print('schedu queue before', s.queue)
assert 1 == 1
print('remove', ev2)
assert ev2 in s.queue
s.cancel(ev2)
print('schedu queue after', s.queue)
assert ev2 not in s.queue # fails (SOMETIMES)
# what is going on here???
# does the last assert also fail from anybody else?