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: “However, to fully use this feature, install the flask[async] module using the following pip command:”

A block of code is set as follows:

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, scoped_session
DB_URL = "postgresql://<username>:<password>@localhost:5433/sms"

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

engine = create_engine(DB_URL)
db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
Base = declarative_base()
def init_db():
    import modules.model.db

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

pip install flask[async]

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: “Clicking this option will lead you to the Enter interpreter path… menu command and, eventually, to the Find… option.”

Tips or important notes

Appear like this.