python_cmd.txt

1) Ubuntu 16.04 has 'python 2.7.12' by default (python -v)
So, to use the latest version of python, it would be better to go for creating a virtual environment ('virtualenv'). 
		$ cd /
		$ sudo apt-get install python3
		$ pip install virtualenv
		$ mkdir myPython
		$ sudo virtualenv -p python3 MYENV    							 		 #set the path of virtualenv to the created(desired) directory-
				or
		$ cd myPython
				
		$ myPython >			     virtualenv myVirtualEnv -p python3			  # create virtualenv named myVirtualEnv for default system Python
		$ myPython >  				 source myVirtualEnv/bin/activate		      # Activate the virtualenv
		$(myVirtualEnv) :myPython >  python -V							 		 #Python 3.5.2
		
		To exit the Virtual terminal
		$ deactivate

		http://askubuntu.com/questions/244641/how-to-set-up-and-use-a-virtual-python-environment-in-ubuntu
		
2)	Start the python interpreter:
		$ python3 (enter)			#>>> and Ctrl+z to terminate

3) Intendation programming rules:
			# import this    #Zen of python

			#Spaces (4) used rather than {}
			# To termainate a loop,=>Blank line
			
4) break keyword: breaks the control of the innermost loop and the lst statement immediately following the loop			

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 -> Auto intend python file:
 
 pip install autopep8
 autopep8 <file.py> --in-place
 
 -> Install mysql to connect from python:
 
 apt install build-essential
 apt install libmysqlclient-dev
 pip install mysqlclient
 
 -> Install SQLAlchemy in python:
 
 pip install flask-mysql
 pip install Flask-SQLAlchemy 
 
 -> apt-get install python-pip
pip install flask     			#will first install Flask framework:
apt-get install python-mysqldb
pip install flask-restful