Python can be installed onto operating systems in a variety of different ways.
The easiest way is to visit https://www.python.org/downloads/ and download the web-based installer which will downloaded the needed components at install time.
The Anaconda distribution is also contains the Python interpreter.
ModuleNotFoundError: No module named ‘_ctypes’
This is likely due to
libffi-dev (Debian-like) or
libffi-devel (RedHat-like) missing from your systems. Install with:
$ sudo yum install libffi-devel
and then try building Python again.