How to generate the list I want?

[Krookroo]

Hi :)

I want to generate a list of lists of the form:

[ [0, 4, 4, 4, 4]
  [4, 0, 4, 4, 4]
  [4, 4, 0, 4, 4]
  [4, 4, 4, 0, 4]
  [4, 4, 4, 4, 0] ]

Nothing I'm trying works, it seems python wants to simplify my life by changing all the lists indices instead of just the one i'm pointing at him. Examples:

Xs = [[4]*5]*5
for i, X in enumerate(Xs):
    Xs[i][i] = 0
print Xs

Xs, t = [], [4, 4, 4, 4, 4]
for i in range(5):
    Xs.append(t)
    Xs[i][i] = 0
print Xs

Xs, t = [], [4, 4, 4, 4, 4]
for i in range(5):
    temp = t
    temp[i] = 0
    Xs.append(temp)
print Xs
print t, "f you, i don't even touch t"

outputs:

Output:
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
[0, 0, 0, 0, 0] f you, i don't even touch t

In reality, I need to make a slightly bigger list, and I could totally make it by hand, but seriously what is this behaviour? Not only it's totally unintuitive, but especially the last example is ridiculous, I just can't find how to generate that... Is my logic flawed there and I'm too blind to see?

Yes I'm a bit angry because I just lost one hour to understand why my monte-carlo optimization of non-convex stuff did send me errors it shouldn't. It's easy, I don't have the starting list of indices I should have.