Variable Substitution in commands or funtion names?
fleet at teachout.org
fleet at teachout.org
Thu Jul 19 16:46:40 EDT 2001
> Date: Thu, 19 Jul 2001 11:43:21 -0700
> From: Chris Barker <chrishbarker at home.net>
>
>fleet at teachout.org wrote:
>
>> I think I may have gotten myself into a box.
>>
>> I have a module "cust.py" that contains several dictionaries - each
>> references a different customer with address info, etc. such as:
>>
>> smith={"busname":"Smitties", "street":"123 West Ave"}
>
>I think this is your problem right here. Having the customer name as a
>variable name is problematic, it means the customer's names are
>hard-coded into your module.
I've created dictionaries for each customer in cust.py. I don't have a
lot of customers and the information doesn't change often, therefore it's
pretty easy to edit the text file "cust.py" to make corrections or
add/delete customers.
If you'd like to do some charter fishing for rock fish in the Chesapeake,
here's what the actual first entry in my cust.py looks like:
Antonia={
"name":"Nicholson & Daughters",
"owner":"Capt. Charles Nicholson",
"addr":"Bay Forest Rd.",
"city":"Lexington Park",
"st":"MD",
"zip":"20653",
"phone":"301-863-2767",
"email":"",
"web":"http://www.paxp.com/antonia/"}
It looks like all I need to do to convert to your suggestion is add:
"Customers={" before "Antonia," replace the "=" after Antonia with an
opening brace (and ditto for each of the other customers) and add a
closing brace at the end of the customers.
>You can do it, and some others have
>suggested how(you might also want to look at eval and exec),but why not
>use a nested dictionary?
>
>Customers = {smith: {"busname":"Smitties", "street":"123 West Ave"},
> jones: {"busname":"Joneses", "street":"123 East Ave"},
> ....}
And how are these NOT hardcoded into a module? How would I access them
otherwise?
>now you do:
>
>from cust import Customers
>print Customers[CurCust]["street"]
>
Thanks for the input. I'll try this.
- fleet -
>--
>Christopher Barker,
>Ph.D.
>ChrisHBarker at home.net --- --- ---
>http://members.home.net/barkerlohmann ---@@ -----@@ -----@@
> ------@@@ ------@@@ ------@@@
>Oil Spill Modeling ------ @ ------ @ ------ @
>Water Resources Engineering ------- --------- --------
>Coastal and Fluvial Hydrodynamics --------------------------------------
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