Convert bbox to polygon and encode as geo csv for TileMill

bbox2csv.py

#!/usr/bin/env python

'''
Usage:
   
   # edit the script below "main" then:
   python bbox2csv.py > bounds.csv   
'''

def bbox2wkt(minx, miny, maxx, maxy):
    # first validate bbox values
    assert isinstance(minx,float) or isinstance(minx,int)
    assert isinstance(miny,float) or isinstance(miny,int)
    assert isinstance(maxx,float) or isinstance(maxx,int)
    assert isinstance(maxy,float) or isinstance(maxy,int)
    assert (minx < maxx), 'failed: %s is not < %s' % (minx,maxx)
    assert (miny < maxy), 'failed: %s is not < %s' % (miny,maxy)
    return "Polygon((%(minx)s %(miny)s, %(minx)s %(maxy)s, %(maxx)s %(maxy)s, %(maxx)s %(miny)s, %(minx)s %(miny)s))" % locals()

if __name__ == "__main__":
    bbox = '-122,45,-100,48'
    print 'wkt,name'
    print '"%s","%s"' % (bbox2wkt(*map(float,bbox.split(','))),'bounds')