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: "Thedecimal package also provides aContext object, which allows fine-grained control over the precision, display, and attributes ofDecimal objects."

A block of code is set as follows:

from decimal import getcontext
ctx = getcontext()
num = Decimal('1.1')
num**4  # Decimal('1.4641')
ctx.prec = 4 # set new precision
num**4  # Decimal('1.464')

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

from numpy import linalg

A = np.array([[3, -2, 1], [1, 1, -2], [-3, -2, 1]])
b = np.array([7, -4, 1])

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

          python3.8 -m pip install numpy scipy
        

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."

Warnings or important notes appear like this.

Tips and tricks appear like this.