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: "We can print/gather the information we deem relevant inside the PROFILER function."

A block of code is set as follows:

import sys

def profiler(frame, event, arg):
    print 'PROFILER: %r %r' % (event, arg)

sys.setprofile(profiler)

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

Traceback (most recent call last): 
  File "cprof-test1.py", line 7, in <module> 
    runRe() ...
  File "/usr/lib/python2.7/cProfile.py", line 140, in runctx 
    exec cmd in globals, locals 
 File "<string>", line 1, in <module> 
NameError: name 're' is not defined 

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

$ sudo apt-get install python-dev libxml2-dev libxslt-dev

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: "Again, with the Callee Map selected for the first function call, we can see the entire map of our script."