print "DEBUG: _flames=%r" % self._flames
for f in self._flames:
    print "DEBUG: ticking: %r" % f
    f.tick()
print "DEBUG: _flames=%r" % self._flames

# output:
# DEBUG: _flames=[<FlameCross (3, 3) 0x202d510>, <FlameEndUp (3, 2) 0x203af90>, <FlameEndDown (3, 4) 0x203af50>, <FlameEndLeft (2, 3) 0x203af
10>, <FlameEndRight (4, 3) 0x203afd0>]
# DEBUG: ticking: <FlameCross (3, 3) 0x202d510>
# DEBUG: ticking: <FlameEndDown (3, 4) 0x203af50>
# DEBUG: ticking: <FlameEndRight (4, 3) 0x203afd0>
# DEBUG: _flames=[<FlameEndUp (3, 2) 0x203af90>, <FlameEndLeft (2, 3) 0x203af10>]