import arcpy
# Create an Array object.
#
array = arcpy.Array()
# List of coordinates.
#
coordList = ['1.0;1.0','1.0;10.0','10.0;10.0','10.0;1.0']
# For each coordinate set, create a point object and add the x- and
# y-coordinates to the point object, then add the point object
# to the array object.
#
for coordPair in coordList:
x, y = coordPair.split(";")
pnt = arcpy.Point(x,y)
array.add(pnt)
# Add in the first point of the array again to close the polygon boundary
#
array.add(array.getObject(0))
# Create a polygon geometry object using the array object
#
boundaryPolygon = arcpy.Polygon(array)
