[Tutor] knowing when a list is updated by a thread

[Vaibhav.bhawsar]

i have this code to print every new element in a list only when the list
length changes (while the list is updated by a thread running elsewhere)...I
was wondering if there is a pythonic way to do this? how does one know when
there is a new element in the list?

prevlength = 0
    while geoCode.running:
        places = geoCode.getResults() #returns a list with most up to date
elements..the list grows as the thread that updates it
        if len(places) > prevlength:
            print places[prevlength]
            prevlength = len(places)


thank you!
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