"Sean Murphy" <mhysnm1...@gmail.com> wrote in message
news:0cf6151e-e063-4252-9ac3-4fd4698eb...@gmail.com...
> Hello all.
>
> I have some questions again. :-)
>
> I wish to be able to place a function within a data structure. I would
> like to use a dictionary because I could pass it a key and then the
> function could be called. I couldn't find anything on the net to show me
> how to do this. More then likely, not using the right search terms.
>
> For example:
>
> funct_call = { 'bhp' : 'bhp_counters (addict[key1][key2])', 'ospf' :
> 'ospf_counters (addict[key1][key2])'}
>
> I am sure there is a way to do this.
>
[...]
There are two problems with your example.
First, it is (probably) correct to enclose the key in quotes, but definitely
incorrect to enclose the function name in quotes. Assuming you have already
declared the function, you just use the function name, without quotes, as
the value.
Secondly, you must not place brackets, with or without arguments, after the
function name. The difference is that, without brackets it *refers* to the
function, with brackets it *calls* the function. You only want to call it at
execution time, not when setting up the dictionary.
If you have a variable 'var' which contains 'bhp' or 'ospf', you would at
execution time have the following -
funct = funct_call[var] # retrieve the function from the dictionary
funct(addict[key1][key2]) # call the function with arguments
This is usually compressed into one line -
funct_call[var](addict[key1][key2])
This works if you always use the same arguments, no matter which function
you call. Things get trickier if they differ.
Frank Millman
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