..................................................................... 54 OOP IN PYTHON –PYTHON DESIGN PATTERN............................................................................ 57 OOP in Python .. 57 Why is Design Pattern Important? ................................................................................................................. 57 Classification of Design Patterns ...... ............................................................................. 57 Commonly used Design Patterns .......................................................................................

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4 Discussions 49 4.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever() Then open this HTML file in a browser. asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever() Then open this HTML file in several browsers.

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4 Discussions 35 4.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever() Then open this HTML file in a browser. run_until_complete( websockets.serve(counter, 'localhost', 6789)) asyncio.get_event_loop().run_forever() Then open this HTML file in several browsers.

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4 Discussions 27 4.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever() Then open this HTML file in a browser. handler may subscribe to some channels on a message broker, for example. 1.1.5 That’s all! The design of the websockets API was driven by simplicity. You don’t have to worry about performing the opening

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4 Discussions 35 4.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever() Then open this HTML file in a browser. run_until_complete( websockets.serve(counter, 'localhost', 6789)) asyncio.get_event_loop().run_forever() Then open this HTML file in several browsers.

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 3 Additional Notes 233 3.1 Design Decisions in Flask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . itself. Numerous extensions provide database integration, form validation, upload handling, various open authentication technologies, and more. Flask may be “micro”, but it’s ready for pro- duction use on approved extensions do not break with future releases. As your codebase grows, you are free to make the design decisions appropriate for your project. Flask will continue to provide a very simple glue layer to

Extensions Building Extensions Command Line Interface Application Discovery Run the Development Server Open a Shell Environments Debug Mode Environment Variables From dotenv Environment Variables From virtualenv Function Options Command Line Interface Additional Notes Design notes, legal information and changelog are here for the interested. Design Decisions in Flask The Explicit Application Object The Routing itself. Numerous extensions provide database integration, form validation, upload handling, various open authentication technologies, and more. Flask may be “micro”, but it’s ready for production use on

Django at a glance Design your model Install it Enjoy the free API A dynamic admin interface: it’s not just scaffolding – it’s the whole house Design your URLs Write your views Design your templates This miscellany API stability What “stable” means Stable APIs Exceptions Design philosophies Overall Models Database API URL design Template system Views Cache Framework Third-party distributions of Django Flatpages Redirects Signals System check framework The sites framework Unicode in Django The Django open-source project Learn about the development process for the Django project itself and about how you

Django at a glance Design your model Install it Enjoy the free API A dynamic admin interface: it’s not just scaffolding – it’s the whole house Design your URLs Write your views Design your templates This miscellany API stability What “stable” means Stable APIs Exceptions Design philosophies Overall Models Database API URL design Template system Views Cache Framework Third-party distributions of Django Flatpages Redirects Signals System check framework The sites framework Unicode in Django The Django open-source project Learn about the development process for the Django project itself and about how you

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.16 The Django open-source project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Getting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1321 7.2 Design philosophies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . documentation Django Documentation, Release 1.8.20.dev20180306181007 • Unicode in Django 1.16 The Django open-source project Learn about the development process for the Django project itself and about how you