Re: The best way to copy a list?

Am 18.06.25 um 13:59 schrieb Mark Summerfield:

I'm coming to Tcl from Python & Go. In Python saying `a = [1, 2, 3]` and
then `b = a` makes `b` a _reference_ to `a` rather than an independent
variable. Now I realise that Tcl doesn't do it that way and that `set a
$b` works fine.

I suspected something like this, when reading your question. In Python terms, Tcl has only immutable values. Whereas in Python, the outcome of a[2] = 'x' depends on what exact type this "a" thing is, in Tcl it is either impossible or it creates a copy on write (lset).
This is part of the bigger "EIAS" concept ("everything is a string") which also means that values can be type-casted automatically - however, in good practice Tcl, you try to stick with a type nonetheless.
Christian