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2013-03-31T15:40:16.873
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2013-04-05T22:31:41.127
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2013-04-05T22:31:41.127
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So here is an example of how I use list comprehensions to do this sort of thing. If you don't know, the list comprehension is <code>something = [explorer(x) for x in something]</code>. That's also where the recursion is happening. What you get back is a list of the exact same structure, but you've "been to" every endpoint and can check for and replace things. I did a couple arbitrary replacements. <pre><code>>>> tree = ['S', ['NP', ['DET', 'There']], ['S', ['VP', ['VERB', 'is'], ['VP', ['NP', ['DET', 'no'], ['NOUN', 'asbestos']], ['VP', ['PP', ['ADP', 'in'], ['NP', ['PRON', 'our'], ['NOUN', 'products']]], ['ADVP', ['ADV', 'now']]]]], ['.', '.']]] >>> def explorer(something): if type(something) == list: something = [explorer(x) for x in something] else: # You may want to check other conditions here, like if it's a string if something == 'asbestos': something = 'Oh my' if something == 'S': something = 'Z' return something >>> explorer(tree) ['Z', ['NP', ['DET', 'There']], ['Z', ['VP', ['VERB', 'is'], ['VP', ['NP', ['DET', 'no'], ['NOUN', 'Oh my']], ['VP', ['PP', ['ADP', 'in'], ['NP', ['PRON', 'our'], ['NOUN', 'products']]], ['ADVP', ['ADV', 'now']]]]], ['.', '.']]] >>> </code></pre> I just noticed something after reading your words more carefully. The reason you are not able to "propagate replacements upwards" is because your loop is structured something like this: <pre><code>for x in aList: if x = somethingSpecial: x = somethingElse </code></pre> That does not work in Python, but this does: <pre><code>for i,x in enumerate(aList): if x = somethingSpecial: aList[i] = somethingElse </code></pre> Now <code>aList</code> has ben modified the way you want. If you don't know what <code>enumerate()</code> does, just copy/paste this: <pre><code>aList = ['a','b','c'] for i,x in enumerate(aList): print(i,x) </code></pre>
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