Installing Python 3.9.9

Preparing the Environment

Perform the following operations in sequence. Otherwise, Python 3.9.9 may fail to be installed (SSL component dependency fails). As a result, PoWA-collector and PoWA-web fail to be installed.

yum install readline* -y

yum install zlib* -y

yum install gcc-c++ -y

yum install sqlite* -y

yum install openssl-* -y

yum install libffi* -y

Installing Python 3.9.9

1. Run the following command as user root:

   mkdir env

   cd env

   wget https://www.python.org/ftp/python/3.9.9/Python-3.9.9.tgz

   tar -xzvf Python-3.9.9.tgz

   cd Python-3.9.9

   ./configure --prefix=/usr/local/python3.9.9

   make && make install

2. Create a soft link.

   ln -s /usr/local/python3.9.9/bin/python3.9 /usr/bin/python

   ln -s /usr/local/python3.9.9/bin/pip3.9 /usr/bin/pip

Verify the Installation.

1. Verify the installation, especially the SSL function.

   [root@ecs-ad4d Python-3.9.9]# python

   Python 3.9.9 (main, Nov 25 2021, 12:36:32)

   [GCC 8.4.1 20200928 (Red Hat 8.4.1-1)] on linux

   Type "help", "copyright", "credits" or "license" for more information.

   import ssl

   import urllib.request

   context = ssl._create_unverified_context()

   urllib.request.urlopen('https://www.example.com/',context=context).read()

2. If any command output is displayed, the installation is successful. Run the following command to exit.

   quit()