[967] Merge multiple polygons into a single unified polygon

In Shapely, you can use the unary_union method to merge a list of polygons into a single, unified polygon. Here's an example:

from shapely.geometry import Polygon
from shapely.ops import unary_union
 
# Create a list of polygons
polygon_list = [Polygon([(0, 0), (1, 0), (1, 1), (0, 1)]), 
                Polygon([(1, 0), (2, 0), (2, 1), (1, 1)]),
                Polygon([(2, 0), (3, 0), (3, 1), (2, 1)])]
 
# Use unary_union to merge the list of polygons
merged_polygon = unary_union(polygon_list)
 
print(merged_polygon)

In this example, unary_union takes a list of Shapely geometries (polygons in this case) and returns a single geometry that represents the union of all the input geometries.

Keep in mind that the resulting geometry might be a MultiPolygon if the input polygons are disjoint or have holes. You can check the type of the result using type(merged_polygon). If it's a MultiPolygon and you want a single Polygon, you may need to further process the result based on your specific needs.