superpollo wrote:
> 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
This is simple -- maybe a bit brutal -- and if the strings get long it will
be slow:
def replaced (input, replacements):
output = []
while input:
for target in replacements:
if input.startswith (target):
output.append (replacements [target])
input = input [len (target):]
break
else:
output.append (input[0])
input = input [1:]
return ''.join (output)
original = 'fooxxxbazyyyquux'
replacements = {'quux':'foo', 'foo':'bar', 'baz':'quux'}
print original, '-->', replaced (original, replacements)
Mel.
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