Flask getting started

15 Jun 2017 python python tutorial flask

Ref

http://flask.pocoo.org/docs/0.12/installation/

Environment setting:

Have both python 2.x and 3.x on machine = create a virtualenv to using python 3.x
virtualenv and virtualenvwrapper-win both are installed for 3.x
WORKON_HOME=D:\working\projects\learning\python\virtualenv

Create virtualenv

mkvirtualenv -p C:\Python36-32\python.exe flasktutor

Install flask

pip install flask

This will install flask and flask related packages from this (https://www.palletsprojects.com/)

pip freeze
click==6.7
Flask==0.12.2
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==1.0
Werkzeug==0.12.2

Create project folder and hello.py follow quickstart (http://flask.pocoo.org/docs/0.12/quickstart/)

D:\working\projects\learning\python\flask\flaskhome_tutor\hello.py
progress are track by git

Run application

$ export FLASK_APP=hello.py		# (set FLASK_APP=hello.py on window)
$ python -m flask run

Debug Mode $ export FLASK_DEBUG=1 # enable debug options (set command on window)

This does the following things:

• it activates the debugger
• it activates the automatic reloader
• it enables the debug mode on the Flask application.

Static files

• Are files that are put under folder static from app structure
• to get url for static file: url_for(‘static’, filename=’style.css’)
• static is reserved endpoint used for static files and cannot be used as function endpoint for route