The current behavior of the cmd module is to return the string 'EOF'when the program receives an EOF (e.g. when you press ctrl + d,or when the end of a file is reached). When you're writing some kind ofREPL, you often want to exit when when you get an EOF (for example,python's REPL exits when you press ctrl + d). The way toachieve that functionality here is to create a functioncalled `do_EOF` in your subclass of `cmd.Cmd`, and call `exit()`If you want some other behavior when you get an EOF, you can putthat in `do_EOF` instead.This is problematic for two main reasons:1. `EOF` shows up as an undocumented command when you type `help`. It'snot that big of a deal, but it's definitely not ideal (and perhapsconfusing).2. If you type `EOF` into the terminal, it will call your `do_EOF`function. If your `do_EOF` function exits, typing `do_EOF` will exit theprogram. Seems rather silly.I propose the cmd class NOT catch the EOFError. That will eliminate bothof the above problems. I realize this could be an issue with backwardscompatibility and such, but I don't think it would require muchadjustment (maybe a couple lines).See alsohttps://bugs.python.org/issue13214 andpython#13536