class myClass():

    def event(self):
        #do stuff


my_list = [myClass(i) for i in range(1000)]

#incorrect part:
my_list[0 - 10].event()

for obj in my_list[:9]:
    obj.event()

[x.event() for x in my_list[:9]]

map(lambda x: x.event(), my_list[:9])

[x.event() for x in my_list[:9]]