Conventions used
There are a number of text conventions used throughout this book.
Code in text: 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 Decimal package also provides the Context object, which allows for fine-grained control over the precision, display, and attributes of Decimal 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 the 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:
$ python3.10 -m pip install numpy scipy
Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Select System info from the Administration panel.”
Tips or important notes
Appear like this.
