Note: Operators in the same row are evaluate left to right except ** (Exponentiation) which is right to left binding

Install commands:

Generic update:
sudo apt update

mySQL client install:
sudo apt install mysql-client

** mySQL login command **
mysql -h <RDS endpoint> -u <user name> -p <password>

apache server install:
sudo apt install apache2

python essentials install:
sudo apt install python3

** Refer here for pip install **

sudo apt-get purge python-pip
wget https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py

sudo apt install python-pip
sudo pip install mysql-connector-python
sudo pip install pymysql

sudo pip install boto3

** Boto3 is the Amazon Web Services (AWS) Software Development Kit (SDK) for Python, which allows Python developers to write software that makes use of services like Amazon S3 and Amazon EC2. You can find the latest, most up to date, documentation at our doc site, including a list of services that are supported. **

Exception:

File "/usr/bin/pip", line 9, in <module> from pip import main ImportError: cannot import name main

Explanation:

The exception appears after installing python-pip in the environment. looks like, the get-pip.py script from github is outdated which may be the reason for the exception.

Quick Fix:

Reinstalling python-pip from https://bootstrap.pypa.io website fixed the exception.

sudo apt-get purge python-pip
wget https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py

Explanation:

Python object serialization and deserialization is an important aspect of any non-trivial program. If in Python you save something to a file, if you read a configuration file, or if you respond to an HTTP request, you do object serialization and deserialization.

Serialization refers to the translation of object state into bytes to send it over the network or store it in hard disk. We need serialization because the hard disk or network infrastructure are hardware component and we cannot send objects because it understands just bytes and not objects

Pickling and Unpickling in Python.

Pickling in python refers to the process of serializing objects into binary streams, while unpickling is the inverse of that. It’s called that because of the pickle module in Python which implements the methods to do this.Pickling is useful when you want to save the state of your objects and reuse them at another time without losing any instance specific data. If you are using large files, CPickle is recommended. CPickle is implemented in C, making it much faster.