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

Code words in text are shown as follows: "We can access other Python modules through the use of the import statement."

A block of code is set as follows:

	class Friend(Contact):
		def __init__(self, name, email, phone):
			self.name = name
			self.email = email
			self.phone = phone		

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

	class Friend(Contact):
		def __init__(self, name, email, phone):
			self.name = name
			self.email = email
			self.phone = phone

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

>>> e = EmailableContact("John Smith", "[email protected]")
>>> Contact.all_contacts

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "We use this feature to update the label to a new random value every time we click the Roll! button".