rol.

    The debugger prompt appears before any code is executed; you can set
    breakpoints and type continue, or you can step through the statement
    using step or next.

    The optional *globals* and *locals* arguments specify the
    environment in which the code is executed; by default the
    dictionary of the module __main__ is used (see the explanation of
    the built-in exec() or eval() functions.).
    N)