Nested string substitutions

[Lulu of the Lotus-Eaters]

|def expand(d):
|    while filter(lambda (n, v): d.__setitem__(n,
|        reduce(lambda x,k: x.replace(k, d[k]), d, v)
|    ) or v!=d[n], d.items()): pass

Wow!  Who ever said Perl was hard to read :-).  How long did that take
to think of, Holger?

As marvelous as this is, what I am going with is basically what Mike
Meyer proposed:

    def nested_expand(subs):
        def expand(key, dict):
            previous = ""
            while previous != dict[key]:
                previous = dict[key]
                for old, new in dict.items():
                    dict[key] = dict[key].replace(old, new)
        map(lambda x: expand(x, subs), subs.keys())

Yours, Lulu...

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