Lagrange

def conv(T, x):
    Ttmp = T[:] #skopiowanie zawartosci tablicy bez referencji
    for i in range(1, len(T)):
        T[i] = Ttmp[i -1] * x + Ttmp[i]
    T.append(x * Ttmp[len(Ttmp) - 1])
    return T

def interpolate(X, Y):
    Tret = []
    for i in range(0, len(X)):
        Tret.append(0)
    for i in range(0, len(X)):
        T = [1]
        m = Y[i]
        for j in range(0, len(X)):
            if i != j:
                T = conv(T, -X[j])
                m = m / (X[i] - X[j])
        for j in range(0, len(T)):
            T[j] = T[j] * m
            Tret[j] = Tret[j] + T[j]
    return Tret

X = [0.230000, 0.270000, 0.330000, 0.410000, 0.470000, 0.520000]
Y = [0.050042, 0.100335, 0.171657, 0.255342, 0.309336, 0.376403]

T = interpolate(X,Y)
print T