Checking Your Python Version

In order to go to upgrade your python, you need to check its version. This can be done using the following command:

python3 -V

If python is successfully installed on your server, then you should get something like this:

Python 3.6.7

Updating your Python Version

First, you need to install the required dependencies to compile the Python source code. This can be done using a special command, which is presented below:

yum groupinstall 'development tools' -y && yum install wget openssl-devel bzip2-devel libffi-devel xz-devel -y

After that, we recommend going to the Python source download page to find the latest gzip version of the source code. Replace the urls and filenames in this tutorial with the latest version. Then download your python

wget https://www.python.org/ftp/python/3.9.6/Python-3.9.6.tgz

After that, you need to unpack the archive that you just downloaded. You can do it like this:

tar xzf Python-3.9.6.tgz

Next, compile the Python source

cd Python-3.9.6 && ./configure --enable-optimizations

This is followed by the installation of your Python. Use the following command:

make altinstall

After that, a mandatory step for execution will be to check the name of your new Python executable file

ls /usr/local/bin/python*

Then Install the new default Python executable. Replace the two instances of /python3.9 in the following command with the name of your new Python executable

alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.9 1 && alternatives --set python3 /usr/local/bin/python3.9 && echo "2" | alternatives --config python

Update your PIP

An important step for this update is to update your pip.

/usr/local/bin/python3.9 -m pip install --upgrade pip

Then you should check the name of your new pip executable

ls /usr/local/bin/pip*

Set the new item as default. Use the name of your new pip executable in the following command:

alternatives --install /usr/bin/pip pip /usr/local/bin/pip3.9 1 && alternatives --set pip /usr/local/bin/pip3.9

After that, you need to check the current version of your installed Python. You can make sure like this:

python -V && pip -V

After that, you will be able to see the following:

Python-3.9.6
pip 21.2.3 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)

Checking Your Python Version

In order to go to upgrade your python, you need to check its version. This can be done using the following command:

python3 -V

If python is successfully installed on your server, then you should get something like this:

Python 3.6.7

Updating your Python Version

First, you need to install the required dependencies to compile the Python source code. This can be done using a special command, which is presented below:

# apt-get install wget build-essential libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev liblzma-dev -y

After that, we recommend going to the Python source download page to find the latest gzip version of the source code. Replace the urls and filenames in this tutorial with the latest version. Then download your python

wget https://www.python.org/ftp/python/3.9.6/Python-3.9.6.tgz

After that, you need to unpack the archive that you just downloaded. You can do it like this:

tar xzf Python-3.9.6.tgz

Next, compile the Python source

cd Python-3.9.6 && ./configure --enable-optimizations

This is followed by the installation of your Python. Use the following command:

make altinstall

After that, a mandatory step for execution will be to check the name of your new Python executable file

ls /usr/local/bin/python*

Then Install the new default Python executable. Replace the two instances of /python3.9 in the following command with the name of your new Python executable

update-alternatives --install /usr/bin/python python /usr/local/bin/python3.9 1

Update your PIP

An important step for this update is to update your pip.

/usr/local/bin/python3.9 -m pip install --upgrade pip

Then you should check the name of your new pip executable

ls /usr/local/bin/pip*

Set the new item as default. Use the name of your new pip executable in the following command:

update-alternatives --install /usr/bin/pip pip /usr/local/bin/pip3.9 1

After that, you need to check the current version of your installed Python. You can make sure like this:

python -V && pip -V

After that, you will be able to see the following:

Python-3.9.6
pip 21.2.3 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)

Install Python 3.7 on your web server

On Nginx

To use Python 3.x (any version), you must enter the following:

# pacman -S uwsgi-plugin-python

Test python

In the appropriate test.py directory, the contents are listed below:

#-*- coding: utf-8 -*-
def wsgi_app(environment, start_response):
    import sys
    output = sys.version.encode('utf8')
    status = '200 OK'
    headers = [('Content-type', 'text/plain'),
               ('Content-Length', str(len(output)))]
    start_response(status, headers)
    yield output

application = wsgi_app

On Apache

Add /etc/httpd/conf/httpd.conf to the end or edit the corresponding configuration file and then add to the corresponding <VirtualHost> block:

WSGIScriptAlias /wsgi_app /srv/http/test.py

Restart Apache

# systemctl restart httpd

Follow the link in the browser http:// YOUR-SERVER-WEB-ADDRESS-OR-IP/wsgi_app and you can see a text page with all versions of Python and GCC.

Delete the test.py test file you just created and WSGIScriptAlias ​​in your Apache configuration.

On Nginx

Create the file /etc/uwsgi/wsgi_app.ini with the following contents:

[uwsgi]
socket = /run/uwsgi/wsgi_app.sock
uid = http
gid = http
plugins = python
chdir = /usr/share/nginx/html/
wsgi-file=test.py
callable = application

Start service uWSGI wsqi_app:

# systemctl start uwsgi@wsgi_app

You need to give Nginx permission to use uWSGI by editing /etc/nginx/nginx.conf, and for each server block that you want to test, add the following. Alternatively, if you use virtual hosts, edit the configuration file for each host:

location ~ \wsgi_app {
    root /usr/share/nginx/html/;
    include uwsgi_params;
    uwsgi_pass unix:/run/uwsgi/wsgi_app.sock;
}

Restart Nginx:

# systemctl restart nginx

Visit your web browser, http://YOUR-SERVER-WEB-ADDRESS-OR-IP/wsgi_app and you will see a test page with versions of Python and GCC.

Delete the test.py file you just created and the location block you just added /etc/nginx/nginx.conf to wsgi_app.

Restart Nginx

# systemctl restart nginx

Stop serving uWSGI wsgi_app:

# systemctl stop uwsgi@wsgi_app

In the final episode, you need to delete /etc/uwsgi/wsgi_app.ini, test files, who you created earlier.

Install Python 2

Connect to your server Ubunt 20.04 and install Python 2 with apt.

$ sudo apt install python2

Check out the Python version

$ python2 -V
Python 2.7.17

Check available Python versions

It is necessary to check the available versions in the system

$ ls /usr/bin/python*
/usr/bin/python2  /usr/bin/python2.7  /usr/bin/python3  /usr/bin/python3.8

Next, look for customized Python alternatives

$ sudo update-alternatives --list python
update-alternatives: error: no alternatives for python

Install alternate versions

To do this, install alternatives to Python 2 and Python 3.

$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 1
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 2

Make sure both of these alternatives work ready to use.

$ sudo update-alternatives --list python
/usr/bin/python2
/usr/bin/python3

Choose an alternate version of Python.

$ sudo update-alternatives --config python
There are 2 choices for the alternative python (providing /usr/bin/python).

  Selection    Path              Priority   Status
------------------------------------------------------------
* 0            /usr/bin/python3   2         auto mode
  1            /usr/bin/python2   1         manual mode
  2            /usr/bin/python3   2         manual mode

Press <enter> to keep the current choice[*], or type selection number: 1

Enter your selection, on Python 2.

Check out the Python version:

$ python -V
Python 2.7.18rc1

Installing Python 3.9.2 on Debian 10

Compiling Python from source allows you to install the latest version of Python and customize your build options. However, you will not be able to support installing Python through the apt package manager. Building Python 3.9.2 on Debian is a relatively straightforward process that only takes a few minutes. So, the first thing to do is to install all the dependencies that will be needed in order to build Python. This can be done using the following command:

apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libsqlite3-dev libreadline-dev libffi-dev curl libbz2-dev

Then you need to download the latest source code from the Python download page using wget:

wget https://www.python.org/ftp/python/3.9.2/Python-3.9.2.tgz

After successfully completing the download, you should immediately unpack the archive. This is available with the command described below:

tar -xf Python-3.9.1.tgz

Next, you need to go to your Python source directory and run configure:

cd Python-3.9.2
./configure --enable-optimizations

The -enable-optimizations option optimizes the Python binary by running multiple tests. The script runs a series of checks to ensure that all dependencies are present on your system by running the Python 3.9.2 build process:

make -j 2

When the build process has successfully progressed to completion, the next step is to install the Python binaries by typing:

make altinstall

This completes the installation and initial configuration of Python. Python is ready to use, to test this, you can enter the command:

python3.9 --version