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To: richard_riehle <rriehle@itu.edu>
cc: python-list@python.org, lac@openend.se
From: Laura Creighton <lac@openend.se>
Subject: Re: Array of Functions
In-Reply-To: Message from richard_riehle <rriehle@itu.edu> of "Tue, 26 May 2015 19:43:31 -0500." <TbKdnVQBR8OujvjInZ2dnUU7-LOdnZ2d@giganews.com>
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Date: Wed, 27 May 2015 03:05:30 +0200
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In a message of Tue, 26 May 2015 19:43:31 -0500, richard_riehle writes:
>I realized that I mentioned earlier that I found a solution to my origina=
l question, but that I never posted an example of the solution.   So, here=
 is a simplified example for anyone who is interested.
>
>def fArray(fselect, fparm  =3D 1):
>	def A1(p =3D fparm):
>		if p =3D=3D 1:
>			print("printing A1[1]")
>		else:
>			print("printing A1[other]")
>	def A2(p =3D fparm):
>		if p =3D=3D 1:
>			print("printing A2[1]")
>		else:
>			print("printing A2[other]")
>	A =3D [A1, A2]
>	A[fselect]()
>
>In this example, I enclosed two functions within another function, and th=
en put those two functions in a list.  Then, with appropriate parameters, =
I called one of the functions in the list, associated the formal parameter=
 with the function in a call to the array, and presto, it performs the fun=
ction.
>
>The more advanced problem I wanted to solve, a two dimensional array of f=
unctions, once this example is understood, becomes trivial to implement.  =
In fact, the more interesting problem I wanted to solve involved a diction=
ary of functions in a two-dimensional array, and that too was easy to do i=
n Python.  =

>
>When I compare what this would require in C, C++, Java, or most other lan=
guages, I find Python to be really easy for solving this kind of problem.
>
>Next, I plan to develop the solution using decorators and assertions to e=
mpower it with a greater level of portability and to make the functions mo=
re generic.
>
>I hope someone finds this interesting.
>
>Richard Riehle, PhD

I am happy you found a solution, but I fear that adding decorators and
assertions will not do what you are asking for.  I missed the
original question, but it looks to me as if what you were looking
for is a nice python dictionary with a tuple as an index.  Since
tuples are immutable, they can be used as indices, while arrays
cannot.

Or, despite finding it interesting, have I misunderstood what
you are doing altogether?

Laura