Is there a list.replace builtin I cannot find? Or a workaround?

Also: How would perform string.swap(s1, s2) in the following cases:

* There is no secure 'temp' char, meaning that
        s.replace(s1,temp).replace(s2,s1).replace(temp,s2)
  will fail because any char can be part of s.

* Either s1 or s2 can be more than a single char.

Denis
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la vita e estrany
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