Python, seriously? How do you explain to 5-year-olds what the following line does?

  if __name__ == "__main__":

Python is there for when you move beyond beginner and you start to need libraries.

For everyone else, there's javascript: open up your browser console and you have a full IDE with breakpoints and inspection, and an interactive REPL. Object orientation is there if you want it, but what 5-year-old does? Functional paradigms are there when you're ready for them (map and foreach on arrays, for example). A smooth learning curve that gives you power when you reach for it, and a fast, flexible GUI environment. Free source code to study comes with every web site.

Best of all, its flexibility fosters many differing programming styles: consider jQuery and Angular. Very few programming ecosystems could give rise to such unique styles. I wish my first programming language was javascript, instead of C64 BASIC, with its 38911 basic bytes free.