计算一个点是否在多边形里 Python 版，计算一个点python,def isInside

计算一个点是否在多边形里 Python 版，计算一个点python,def isInside

def isInsidePolygon(pt, poly):    c = False    i = -1    l = len(poly)    j = l - 1    while i < l-1:        i += 1        print i,poly[i], j,poly[j]        if ((poly[i]["lat"] <= pt["lat"] and pt["lat"] < poly[j]["lat"]) or (poly[j]["lat"] <= pt["lat"] and pt["lat"] < poly[i]["lat"])):            if (pt["lng"] < (poly[j]["lng"] - poly[i]["lng"]) * (pt["lat"] - poly[i]["lat"]) / (poly[j]["lat"] - poly[i]["lat"]) + poly[i]["lng"]):                c = not c        j = i    return cif __name__ == '__main__':    abc = [{'lat':1, 'lng':1},{'lat':1, 'lng':4},{'lat':3, 'lng':7},{'lat':4, 'lng':4},{'lat':4, 'lng':1}]    print isInsidePolygon({'lat':2, 'lng':5}, abc)