How to assign a function to another function

[Stefano Esposito]

Hi all

what i'm trying to do is this:

>>>def foo ():

.... return None
....

>>>def bar ():

.... print "called bar"
....

>>>def assigner ():

.... foo = bar
....

>>>assigner()
>>>foo()

called bar

>>>

This piece of code is not working and even trying with

>>>def assigner (a, b):

.... a = b
....

>>>assigner(foo , bar)
>>>foo()

isn't working. How can I achieve my goal?

Thanks for your help! :)
--
Stefano Esposito <stefano.esposi to87@gmail.com>

[Paul Rudin]

Re: How to assign a function to another function

Stefano Esposito <stefano.esposi to87@gmail.comw rites:

Hi all
>
what i'm trying to do is this:
>

>>>>def foo ():

... return None
...

>>>>def bar ():

... print "called bar"
...

>>>>def assigner ():

... foo = bar
...

>>>>assigner( )
>>>>foo()

called bar

>>>>

>
This piece of code is not working and even trying with...

... How can I achieve my goal?

By adding the line:
global foo
at the beginning of the body of assigner.

The assignment to foo in the body of assigner makes a local (to the
function) variable called foo and assigns bar to it.

[Stefano Esposito]

Re: How to assign a function to another function

On Mon, 17 Sep 2007 17:49:58 +0100
Paul Rudin <paul.nospam@ru din.co.ukwrote:

Stefano Esposito <stefano.esposi to87@gmail.comw rites:
>

Hi all

what i'm trying to do is this:

>>>def foo ():

... return None
...

>>>def bar ():

... print "called bar"
...

>>>def assigner ():

... foo = bar
...

>>>assigner()
>>>foo()

called bar

>>>

This piece of code is not working and even trying with...

>
>

... How can I achieve my goal?

>
>
By adding the line:
global foo
at the beginning of the body of assigner.
>

This worked, thanks a lot :)


--
Stefano Esposito <stefano.esposi to87@gmail.com>

[Paddy]

Re: How to assign a function to another function

On Sep 17, 6:11 pm, Stefano Esposito <stefano.esposi t...@gmail.com>
wrote:

On Mon, 17 Sep 2007 17:49:58 +0100
>
>
>
Paul Rudin <paul.nos...@ru din.co.ukwrote:

Stefano Esposito <stefano.esposi t...@gmail.comw rites:

>

Hi all

>

what i'm trying to do is this:

>

>>>>def foo ():
... return None
...
>>>>def bar ():
... print "called bar"
...
>>>>def assigner ():
... foo = bar
...
>>>>assigner( )
>>>>foo()
called bar

>

This piece of code is not working and even trying with...

>

... How can I achieve my goal?

>

By adding the line:
global foo
at the beginning of the body of assigner.

>
This worked, thanks a lot :)
>
--
Stefano Esposito <stefano.esposi t...@gmail.com>

I got this explained to me awhile back and blogged on it here:

http://paddy3118.blogspot.com/2006/07/python-functions-assignments-and-scope.html

- Paddy.