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In the "closer look at Python" sections we will systematically review key programming concepts.

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Later we'll see how to use functions when tabulating data, as in 1.1.Take care to get spelling and punctuation right, and remember that you don't type the Note Your Turn: Try searching for other words; to save re-typing, you might be able to use up-arrow, Ctrl-up-arrow or Alt-p to access the previous command and modify the word being searched.You can also try searches on some of the other texts we have included.Test your understanding by modifying the examples, and trying the exercises at the end of the chapter.Let's begin by finding out the length of a text from start to finish, in terms of the words and punctuation symbols that appear. But there are only four distinct vocabulary items in this phrase.The vocabulary of a text is just the is the form or spelling of the word independently of its specific occurrences in a text — that is, the word considered as a unique item of vocabulary.

Our count of 2,789 items will include punctuation symbols, so we will generally call these unique items instead of word types.

How many distinct words does the book of Genesis contain?

To work this out in Python, we have to pose the question slightly differently.

Each row of the table will involve the same computation but with different data, and we'll do this repetitive work using a function. At one level, it is a sequence of symbols on a page such as this one.

At another level, it is a sequence of chapters, made up of a sequence of sections, where each section is a sequence of paragraphs, and so on.

Once you've installed NLTK, start up the Python interpreter as before, and install the data required for the book by typing the following two commands at the Python prompt, then selecting the .