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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 c

if __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)