There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The pip installer can be used to install NLTK, with an optional installation of numpy."

A block of code is set as follows:

>>> large_words = dict([(k,v) for k,v in frequency_dist.items() if len(k)>3])
>>> frequency_dist = nltk.FreqDist(large_words)
>>> frequency_dist.plot(50,cumulative=False)

Any command-line input or output is written as follows:

import nltk
nltk.download()

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Navigate to stopwords and install it for future use."