[darkf]

... Yeah, that's gnarly. :D That is emulating `let` using lambdas, though, and not mutable assignment. Still useful if you really want to nest them, but still immutable.

[grondilu]

I don't know, isn't it possible to do the equivalent of mutable assignment if I use the same variable name several times?

For instance for the equivalent of x = 3; x = x + 1; print(x):

    (lambda x: (lambda x: print(x))(x+1))(3);