def subtract_turbine_exclusion_zone(min_spacing: float,
source_shape: BaseGeometry,
turbine_positions: [Point],
) -> BaseGeometry:
"""
Subtract the min spacing around each turbine from a site polygon
:param min_spacing: minimum distance around turbine
:param source_shape: site polygon
:param turbine_positions: Points of the turbines within the source_shape
:return: modified shape with the circles around the turbines removed
"""
if len(turbine_positions) <= 0:
return source_shape
return source_shape.difference(
unary_union([turbine.buffer(min_spacing) for turbine in turbine_positions]))
