Setting up a virtual environment with Tornado 5.1.1

In Chapter 1, Developing RESTful APIs and Microservices with Flask 1.0.2, we learned that throughout this book we are going to work with the lightweight virtual environments introduced and improved in Python 3.4. Now, we will follow many steps to create a new lightweight virtual environment to work with Tornado 5.1.1. It is highly recommended to read the section named Working with lightweight virtual environments in Chapter 1, Developing RESTful APIs and Microservices with Flask 1.0.2, if you don't have experience with lightweight virtual environments in modern Python. The chapter includes all the detailed explanations about the effects of the steps we are going to follow.

The following commands assume that you have Python 3.7.1 installed on Linux, macOS, or Windows.

First, we have to select the target folder...