Python Installation (Using 3.7 for exmple)

Install packages needed

sudo apt update

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

Download desire release's source code from here:

curl -O https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tar.xz

Extract
```
tar -xf Python-3.7.3.tar.xz
```
Nevigate to the python source directory and run the configure script that will perform a number of checks to make sure all the dependencies on your system are present:
```
cd Python-3.7.3
```
```
./configure --enable-optimizations
```
Note: --enable-optimizations option will optimize the Python binary by running multiple tests which will make the build preocess slower.
Run make to start the build process:
```
make -j 8
```
Note: For faster build time, modify the -j flag according to your processor. To figure otu the numbef for the cores, you can find it with nproc command. The code snippet above is for machines with 8 cores.
After the build is done, install the Python binaries by running the following:
```
sudo make altinstall
```
Note: Avoid using make installas it'll overwrite the default system python3 binary.
To verify that the Python has been installed successfully, run:
```
python3.7 --version
```

Update python3.7 to update alternatives:

sudo update-alternatives --install /usr/local/bin/python3 python3 /usr/bin/python3.7 1

Update python3 to point to python3.7:

sudo update-alternatives --config python3

Original sources:

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