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Implement the `ParkingLot` class with `park_vehicle` and `remove_vehicle` methods. Handle `NoSpotFoundException`.
class ParkingLot:
def __init__(self, capacity):
self.capacity = capacity
self.spots = [None] * capacity
def park_vehicle(self, vehicle):
# TODO: Implement finding logic
spot_idx = self._find_spot()
if spot_idx == -1:
raise Exception("Full")
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