# Topic covered
Python different version installation in 2 ways
* Using Source code
* Using apt-get

Pip installation

1. Python installation

Way 1 - Using Source code

Update the packages list and install the packages necessary to build Python source

sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev

# Download source code using wget command
# wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
wget https://www.python.org/ftp/python/3.6.10/Python-3.6.10.tgz

# Extract
tar -xf Python-3.6.10.tgz

# Install
sudo cp -r Python-3.6.10 /opt
cd /opt/Python-3.6.10
sudo ./configure
./configure --enable-optimizations # optional
sudo make
sudo make install

Way 2 - Using Apt

• https://linuxize.com/post/how-to-install-python-3-7-on-ubuntu-18-04/
• https://www.tecmint.com/install-python-in-ubuntu/

Start by updating the packages list and installing the prerequisites

sudo apt update
sudo apt install software-properties-common

Next, add the deadsnakes PPA to your sources list

sudo add-apt-repository ppa:deadsnakes/ppa

Once the repository is enabled, install Python 3.7

sudo apt install python3.7
python3.7 --version

Issue that may occur

• configure: error: no acceptable C compiler found in $PATH

sudo apt-get install build-essential

• zlib
• require TLS/SSL, however the ssl module in Python is not available

fatal error: Python.h: No such file or directory

sudo apt-get install python3-dev
sudo apt install libpython3.7-dev

2. Pip installation

# Install pip3
sudo apt install python3-pip

# Change default
alias pip=pip3

# pip for Python3.7
python3.7 -m pip install pip

# See Version
pip --version