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: “In the preceding code, first, the instance folder is loaded from the given path; then, the configuration file is loaded from the config.cfg file in the given instance folder.”

A block of code is set as follows:

PRODUCTS = {
    'iphone': {
        'name': 'iPhone 5S',
        'category': 'Phones',
        'price': 699,
},

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 flask_wtf.file import FileField, FileRequired
class Product(db.Model):
    image_path = db.Column(db.String(255))
    def __init__(self, name, price, category, image_path):
        self.image_path = image_path

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

$ sudo apt update 
$ sudo apt install python3-dev 
$ sudo apt install apache2 apache2-dev

Bold: Indicates a new term, an important word, or words that you see on screen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “It can also handle the Remember me feature, account recovery features, and so on.”

Tips or important notes

Appear like this.