Red Hat / CentOS versions come, by default, with an older version of Python installed:

# python --version
Python 2.7.5

Python version 3 is available, however, it is not included with the Red Hat and/or CentOS distribution (at the time of writing this article).

If you do wish to use Python version 3, you can download this version from iuscommunity.org, which is an online community dedicated to delivering high quality packages of newer versions of popular software.

Here's how to do that:

First, install the ius-release.rpm:

# yum install https://centos7.iuscommunity.org/ius-release.rpm

Next, install Python 3.6:

# yum install python36u python36u-libs python36u-devel python36u-pip

Now you can write a python script. Be sure to replace the shebang at the beginning of the script from "python" to "python3.6", like this:

# /usr/bin/env python3.6
print('Hello')

If you were to just use just "python" in the shebang, then you get version 2 of Python. By specifiying "python3.6" in the shebang, you get version 3.6.:

# python --version
Python 3.6.5

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