dineshviswanath/python_web_dev_flask_environment_setup.md

## python_web_dev_flask_environment_setup.md

      
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              python_web_dev_flask_environment_setup.md
            
          
    #Starting Python Web development in Mac OS X#
Objective: Getting started with Python Development
Operating System: Mac OS X
Python version installed: 3.5 (5th December 2015)
Downoad the lastest Python from https://www.python.org/downloads/
Mac OS uses default 2.x version out of box.
To check whether, python has been installed successfully. try the following command.
python3 -V
Python 3.5.0

Above step ensure that Python 3.5 has been installed successfully.
This is the high level outline of this post:
Mas OS X -> Python 3.5 -> Virtaulenv -> Flask --> app.py(first Hello world )
Installing virtaulenv: (Step 1 of
Why use virtualenv?

Having different version of libraries for different projects
Solves the elevated privillege issue as virtualenv allows you to install with user permission

    sudo pip3 install virtualenv
    virtualenv --version
    13.1.2
Now lets create the first flask app
mkdir ~/projects
    cd ~/projects
Now we will create a virtualenv
virtualenv hello_flask
cd hello_flask
If you list the contents of the hello_flask directory, you will see that it has created several sub-directories, including a bin folder (Scripts on Windows) that contains copies of both Python and pip. The next step is to activate your new virtualenv.
source bin/activate
Installing Flask in your virtaulenv
pip install Flask

Hello, Flask
Create a new file called app.py
from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
	return 'Hello, Flask!'

if __name__ == '__main__':
	app.run(debug=True)
Open the web browser with http://localhost:5000