Conventions used

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 if, else, and elif statements control the conditional execution of statements."

A block of code is set as follows:

a=10; b=20
def my_function():

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

if "WARNING" in l:
 yield l.replace("\tWARNING", "")

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

>>> print(warnings_filter([]))

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: "Then you have to manually click Yes or No if the label matches the color."