> From: superpollo <ute...@esempio.net>
> To:
> Date: Mon, 18 Jan 2010 11:15:37 +0100
> Subject: substitution
> hi.
>
> what is the most pythonic way to substitute substrings?
>
> eg: i want to apply:
>
> foo --> bar
> baz --> quux
> quuux --> foo
>
> so that:
>
> fooxxxbazyyyquuux --> barxxxquuxyyyfoo
>
> bye
Using regular expressions the answer is short (and sweet)
mapping = {
"foo" : "bar",
"baz" : "quux",
"quuux" : "foo"
}
pattern = "(%s)" % "|".join(mapping.keys())
repl = lambda x : mapping.get(x.group(1), x.group(1))
s = "fooxxxbazyyyquuux"
re.subn(pattern, repl, s)
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