Passing items of a lsit as arguments

[Tobias Pfeiffer]

Hi!

I want to call a function that was defined with *args in the header, e.g.
the Tkinter.Canvas.create_polygon function. I got the coordinates in a
long list but how can I achieve that every item in this list is passed as
a single parameter?

Example:
bla = [(1,2), (3,4), (5,6), ...]
has to become
create_polygon((1,2), (3,4), (5,6), ..., fill=blue)

Thanks in Advance

Bye
Tobias

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[Karl Pflästerer]

On 26 Mar 2004, Tobias Pfeiffer <- [e-mail] wrote:

the Tkinter.Canvas.create_polygon function. I got the coordinates in a
long list but how can I achieve that every item in this list is passed as
a single parameter? Example:
bla = [(1,2), (3,4), (5,6), ...]
has to become
create_polygon((1,2), (3,4), (5,6), ..., fill=blue)

Either:
apply(create_polygon, bla)
or:
create_polygon(* bla)
KP

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You know you've been sitting in front of your Lisp machine too long
when you go out to the junk food machine and start wondering how to
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chocolate cupcake that's stuck behind the disgusting vanilla one.

[Jeff Epler]

On Fri, Mar 26, 2004 at 09:31:47PM +0000, Tobias Pfeiffer wrote:

Hi!

I want to call a function that was defined with *args in the header, e.g.
the Tkinter.Canvas.create_polygon function. I got the coordinates in a
long list but how can I achieve that every item in this list is passed as
a single parameter?

Example:
bla = [(1,2), (3,4), (5,6), ...]
has to become
create_polygon((1,2), (3,4), (5,6), ..., fill=blue)

You can call the functions with the arguments you want this way:
create_polygon(*bla + (...,), **{'fill'=blue})

However, Tkinter.Canvas is forgiving in the way it accepts arguments.
For instance, this works just fine:

c.create_polygon([(10, 10), (10, 30), (30, 30), (30, 10)], fill="blue") or even c.create_polygon([40, 40, 60, 40, 60, 60, 40, 60], fill="green")

so just write '...create_polygon(bla, ..., fill=blue)'.

Jeff