step-by-step instructions for web development with Flask. Foreword What does “micro” mean? Configuration and Conventions Growing with Flask Foreword for Experienced Programmers Thread-Locals in Flask environments Install Flask Install virtualenv Quickstart A Minimal Application What to do if the Server does not Start Debug Mode Routing Static Files Rendering Templates Accessing Request Data Redirects Sessions Message Flashing Logging Hooking in WSGI Middleware Using Flask Extensions Deploying to a Web Server Tutorial Project Layout Application Setup Define and Access the Database Blueprints and Views Templates

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 1.11 Configuration Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 1.19 Development Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 1.20 Working “micro”, but it’s ready for pro- duction use on a variety of needs. 1.1.2 Configuration and Conventions Flask has many configuration values, with sensible defaults, and a few conventions when getting started

Changelog 63 6 Comms 105 7 Configuration Overview 107 8 Config file and command line options 111 9 Running a notebook server 133 10 Security in the Jupyter notebook server 141 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

Changelog 63 6 Comms 107 7 Configuration Overview 109 8 Config file and command line options 113 9 Running a notebook server 139 10 Security in the Jupyter notebook server 147 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

Changelog 63 6 Comms 107 7 Configuration Overview 109 8 Config file and command line options 113 9 Running a notebook server 139 10 Security in the Jupyter notebook server 147 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

Changelog 63 6 Comms 105 7 Configuration Overview 107 8 Config file and command line options 111 9 Running a notebook server 137 10 Security in the Jupyter notebook server 145 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

Changelog 63 6 Comms 107 7 Configuration Overview 109 8 Config file and command line options 113 9 Running a notebook server 139 10 Security in the Jupyter notebook server 147 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

Changelog 63 6 Comms 107 7 Configuration Overview 109 8 Config file and command line options 113 9 Running a notebook server 139 10 Security in the Jupyter notebook server 147 11 Security in notebook address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

things go wrong Changelog Comms Configuration Configuration Overview Config file and command line options Running a notebook server Security in the Jupyter notebook server Security in notebook documents address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or

things go wrong Changelog Comms Configuration Configuration Overview Config file and command line options Running a notebook server Security in the Jupyter notebook server Security in notebook documents address bar starts with http://localhost: or http://127.0.0.1:, it’s your computer acting as the server. Jupyter doesn’t send your data anywhere else—and as it’s open source, other people can check that being honest about this. You can also use Jupyter remotely: your company or university might run the server for you, for instance. If you want to work with sensitive data in those cases, talk to your IT or