Alternative Python Prompt with auto-completion and syntax highlighting

 Ptpython is an advanced Python REPL:
 .
   * Syntax highlighting.
   * Multiline editing (the up arrow works).
   * Autocompletion.
   * Mouse support.
   * Support for color schemes.
   * Support for bracketed paste.
   * Both Vi and Emacs key bindings.
   * Support for double width (Chinese) characters.
   * ...and many other things.