Indentation problem

[Isaac To]

>>>>> "Skip" == Skip Montanaro <skip at pobox.com> writes:

    Isaac> I'd rather suggest to have a Python-specific indentation command
    Isaac> in Emacs that will "reindent a region in a way that fits the
    Isaac> current indentation style and fit in the current context, but
    Isaac> retain the original meaning".  This really shouldn't be that
    Isaac> difficult.  Anyone will try his elisp skills?

    Skip> Check out python-mode:

    Skip> http://www.python.org/emacs/python-mode/

    Skip> It already has key bindings C-c > and C-c < which indent or dedent
    Skip> the selected region by the indentation delta.  Works like a charm.

This is somewhat close to what I say, but a little bit off: it won't
reindent to the correct tab width.  E.g., if you have the following

def f(a):
    print("Trying " + a)
if (a <= 0):
        return 1
else
        return a * f(a-1)
print("Done")

and you try to use the C-c > command, you end up with

def f(a):
    print("Trying " + a)
    if (a <= 0):
            return 1
    else
            return a * f(a-1)
    print("Done")

It still works, but it doesn't look nice.  What I want is a real
reindentation which understand how Python reads indentation, making it

def f(a):
    print("Trying " + a)
    if (a <= 0):
        return 1
    else
        return a * f(a-1)
    print("Done")

Yes, it is very Python specific.

Regards,
Isaac.