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> from datetime import datetime
> 
> class Clock():
>     def __init__(self, label):
>         self.start = datetime.now()
>         self.label = label
> 
>     def stop(self):
>         end = datetime.now()
>         total = (end - self.start).total_seconds()
>         if total > 0.1:
>             print('EXECUTING {} {:.5f}'.format(self.label, total))
> 
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< 
---
> import threading
> import inspect
> def identifyItem(i):
>     if i is None:
>         return "(None)"
>     else:
>         if inspect.isbuiltin(i):
>             return str(i)
>         else:
>             if 'gotResult' == i.__name__:
>                 return str(i.__closure__[1].cell_contents)
>             f = inspect.getsourcefile(i)
>             ln = inspect.getsourcelines(i)[1]
>             return "%s (%s:%d)" % (str(i), f, ln)
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> 
> #        print "addCallbacks(%s, %s)" % (identifyItem(callback), identifyItem(errback))
> 
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<                         current.result = callback(current.result, *args, **kw)
---
>                         currentItem = identifyItem(callback)
>                         currentThreadId = threading.current_thread().ident
> 
>                         clock = Clock("%s in thread %d" % (currentItem, currentThreadId))
>                         try:
>                             current.result = callback(current.result, *args, **kw)
>                         finally:
>                             clock.stop()
>