vim python: substitute 'spaces' indent to 'tabs'?

[forgems]

On Apr 2, 7:30 am, "Rocky Zhou" <rocky... at gmail.com> wrote:
> I am accustomed to vi my pthon scripts with 'tab' indent. But when I
> copy some code to my script, the indent may be 'spaces'. So I wanna a
> way to substitute those 'spaces' to be 'tabs' conveniently.
>
> For example, I:
> expand -t4 test.py >/tmp/test2.py
> vi /tmp/test2.py
>
> Then in vim, the indents should be:
> /^\( \{4\}\)*/
> but I don't know how to substitute this to that:
> /^\(\t\{\4\}\)*/
>
> Is there any way?
>
> Thanks.

:set noet
:retab