File "examples/terran/ramp_wall.py", line 42, in on_step
depot_placement_positions = self.main_base_ramp.corner_depots
File "C:\Users\ederq\Anaconda3\lib\site-packages\sc2\bot_ai.py", line 80, in main_base_ramp
key=(lambda r: self.start_location.distance_to(r.top_center))

python 3.7