Flip line directions with arcpy

flip.py

def flipLine(myFeatureClass, myQuery):
    try:
        lines=arcpy.UpdateCursor(myFeatureClass, myQuery)
        dsc=arcpy.Describe(myFeatureClass)
        lc=0
        for ln in lines:
            if ln.shape.partCount > 1:
                print "Warning: multiple parts! extra parts are automatically trimmed!"
            lp= ln.shape.getPart(0)
            rPnts=arcpy.Array()
            for i in range(len(lp)): rPnts.append(lp[len(lp)-i-1])
            rPoly=arcpy.Polyline(rPnts)
            ln.shape= rPoly
            lines.updateRow(ln)
    except:
        print "Error:", sys.exc_info()[0]
    finally:
        if lines: del lines
        if ln: del ln