Master flask web dev

.gitignore

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+.idea/

flask-dev/flask-web-dev/README.md

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+- The dynamic components in routes are strings by default but can also be defined with a type. For example, route ```/user/<int:id> ``` would match only URLs that have an integer
+in the id dynamic segment. 
+
+- Flask supports types int, float, and path for routes. 
+
+- The ```__name__ == '__main__' ``` Python idiom is used here to ensure that the development web server is started only when the script is executed directly. When the script is
+imported by another script, it is assumed that the parent script will launch a different server, so the app.run() call is skipped.
+
+-  During development, it is convenient to enable debug mode, which among other things activates the debugger and the re loader. This is done by passing the argument debug set to ```True```.
+
+- Request Hooks - Flask gives you the option to register common functions to be invoked before or after a request is dispatched to a view function
+
+- [Flask-Scripts](https://flask-script.readthedocs.io/en/latest/) : The Flask-Script extension provides support for writing external scripts in Flask. This includes running a development server, a customised Python shell, scripts to set up your database, cronjobs, and other command-line tasks that belong outside the web application itself.

flask-dev/flask-web-dev/chap02/basic-web.py

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+from flask import Flask
+from flask import redirect
+from flask import request
+
+app = Flask(__name__)
+
+
+@app.route('/')
+def home():
+    browser_name = request.headers.get('User-agent')
+    return '<h1>Hello Sohi %s</h1>' % browser_name
+
+
+@app.route('/user/<name>')
+def user(name):
+    return '<h1>Hello, %s!</h1>' % name
+
+
+@app.route('/user/profile')
+def profile():
+    return '<h2>Invalid URL </h2>', 400
+
+
+@app.route('/search')
+def search():
+    return redirect('http://www.google.com')
+
+
+if __name__ == '__main__':
+    app.run(debug=True)