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def poly_Lag(x,y, t):
for i in range(len(x)):
for j in x:
if j!=x[i]:
print(y[i], t-j, x[i]-j)
y[i]=y[i]*((t-j)/(x[i]-j))
print(y)
return sum(y)
f = poly_Lag( [1,2,3], [3,2,1], 0)
print(f)