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POCounting bigrams (pair of two words) in a file using python
 

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  1. POCounting bigrams (pair of two words) in a file using python
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    <p>I want to count the number of occurrences of all bigrams (pair of adjacent words) in a file using python. Here, I am dealing with very large files, so I am looking for an efficient way. I tried using count method with regex "\w+\s\w+" on file contents, but it did not prove to be efficient.</p> <p>e.g. Let's say I want to count the number of bigrams from a file a.txt, which has following content:</p> <pre><code>"the quick person did not realize his speed and the quick person bumped " </code></pre> <p>For above file, the bigram set and their count will be :</p> <pre><code>(the,quick) = 2 (quick,person) = 2 (person,did) = 1 (did, not) = 1 (not, realize) = 1 (realize,his) = 1 (his,speed) = 1 (speed,and) = 1 (and,the) = 1 (person, bumped) = 1 </code></pre> <p>I have come across an example of Counter objects in Python, which is used to count unigrams (single words). It also uses regex approach.</p> <p>The example goes like this:</p> <pre><code>&gt;&gt;&gt; # Find the ten most common words in Hamlet &gt;&gt;&gt; import re &gt;&gt;&gt; from collections import Counter &gt;&gt;&gt; words = re.findall('\w+', open('a.txt').read()) &gt;&gt;&gt; print Counter(words) </code></pre> <p>The output of above code is :</p> <pre><code>[('the', 2), ('quick', 2), ('person', 2), ('did', 1), ('not', 1), ('realize', 1), ('his', 1), ('speed', 1), ('bumped', 1)] </code></pre> <p>I was wondering if it is possible to use the Counter object to get count of bigrams. Any approach other than Counter object or regex will also be appreciated.</p>
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    1. USSwapnil Nawale
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    1. COpaste the sample text in question.
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      1. USAshwini Chaudhary
    2. CODo you have to handle multiple lines or is the text all on one line per file?
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      1. USmhawke
    3. COpossible duplicate of [Counting bi-gram frequencies](http://stackoverflow.com/questions/5883573/counting-bi-gram-frequencies)
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      1. USDavid Robinson
 

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