Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "You can edit /etc/modules to check whether bcm2835-v4l2 is already listed there."

A block of code is set as follows:

set PYINSTALLER=C:\PyInstaller\pyinstaller.py

REM Remove any previous build of the app.
rmdir build /s /q
rmdir dist /s /q

REM Train the classifier.
python HistogramClassifier.py

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

<activity
 android:name="com.nummist.goldgesture.CameraActivity"
 android:label="@string/app_name"
 android:screenOrientation="landscape"
 android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
 <category android:name=
 "android.intent.category.LAUNCHER" />
 </intent-filter>
</activity>

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

$ echo "bcm2835-v4l2" | sudo tee -a /etc/modules

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Click on the link for Bing Search API (not any variant such as Bing Search API – Web Results Only)."