I would like to know if is Python on every G/L distribution preinstalled or not. And why is it so popular on GNU/Linux and not so much on Windows?
Python is not mandatory for Linux, and there are plenty of small "embedded" Linux systems that don't have it. However, many distributions require it. So RHEL may have a dependency on Python because some of their management tools and scripts have been written in it. On those systems python is a requirement.
They are right in that practically all Linux-based desktop and server distributions use at least some GNU components, perhaps most importantly the GNU C Library (glibc), GNU Core Utilities (coreutils) and the Bash shell.
A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System, or, more recently, Wayland), a window manager, and a desktop environment.
Well python does not come on ALL GNU/Linux distros but is present on most of the popular Linux home user distributions (Ubuntu and Fedora Core for example), possibly because most of the application of Gnome desktop environment and KDE use python 2.5+ (not python 3 yet) interpreters. Since python is almost integrated onto the system/environment from the start, linux users feel easy to program in python. But this is a subjective opinion, as java is still equally popular, if not more, on linux distributions.
Similarly, windows (vista/7) comes prepacked with .net framework, with awesome support for C#, and on Mac OSX objective-C is dominant for most os integrated apps; users just tend to program in languages they deem more "native" to the development environment they are using/targeting.
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