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POlookbehind in a for loop
 

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    <p>How are you doing?</p> <p>Am kinda stuck with this problem, I need to use a for loop to find a word that ends with 'ing' and is preceded by a tag that is IN, I come from a background of C and java and there its easy to do, but I cant yet grasp how to do it in python!!</p> <p>I searched around and here is what I think i need to do:</p> <pre><code>for word, tag in list: if word.endswith('ing'): //use regular expression here which should look like this '(?&lt;=\bIN\b)ing' </code></pre> <p>now ofcourse there are some problems there, first I the I need to look at the previous tag not word, the regular expression is probably is wrong and more importantly this just sounds too complicated, am I missing something here, is there a way to just use the index of the word ending with 'ing' to look at the tag behind it like I would have done using java for example??</p> <p>Thank you in advance and sorry if its a silly question, its like my second time trying to write python and am still rusty with it =)</p> <p><em><strong>EDIT</em></strong>: more explanation on what I need to do, and an example here is what am trying to solve, sometimes pos_tag mistakes a VBG for a noun, so i need to write a method that given a tagged list (for example [('Cultivate', 'NNP'), ('peace', 'NN'), ('by', 'IN'), ('observing', 'NN'), ('justice', 'NN')] corrects this problem and returns [('Cultivate', 'NNP'), ('peace', 'NN'), ('by', 'IN'), ('observing', '<strong>VBG</strong>'), ('justice', 'NN')] ) notice how observing has changed </p> <p><em><strong>EDIT2</em></strong>: problem solved now, here is the solution def transform(li): for i in xrange(len(li)): if li[i][0].endswith('ing') and i > 0 and li[i-1][1]: li[i] = (li[i], 'VBG')</p> <p>thank you guys all for your help =D appreciated it </p>
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    1. COWhat problem are you *actually* trying to solve?
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    2. COIt's not very clear what your input/output is. Why are you extracting 2 values from your list? Is it a list of tuples? Also you shouldn't use the variable name `list` as it overrides the builtin function list
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    3. COTry showing a sample of the input and corresponding output.
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      1. USKarl Knechtel
 

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