def point_inside_prlgm(x,y,poly):
    inside = False
    xb = poly[0][0] - poly[1][0]
    yb = poly[0][1] - poly[1][1]
    xc = poly[2][0] - poly[1][0]
    yc = poly[2][1] - poly[1][1]
    xp = x - poly[1][0]
    yp = y - poly[1][1]
    d = xb * yc - yb * xc;
    if (d <> 0):
        oned = 1.0 / d;
        bb = (xp * yc - xc * yp) * oned
        cc = (xb * yp - xp * yb) * oned
        inside = (bb >= 0) & (cc >= 0) & (bb <= 1) & (cc <= 1)
    return inside
 
print(point_inside_prlgm(1, 1, [[1, 2], [0, 0], [2, 0]]))
print(point_inside_prlgm(-1, 1, [[2, 1], [0, 0], [2, 0]]))    

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