Aaron Brady wrote:
Hi, this is a continuation of something that comes up now and again
about reverse lookups on dictionaries, as well as a follow-up to my
pursuit of a Relation class from earlier.
For a reverse lookup, you just need two lookups.
name= {}
phone= {}
name[ '555-963' ]= 'Joan'
phone[ 'Joan' ]= '555-963'
Though maybe the keys in 'name' should be names, instead of the
values in it. The variable name doesn't clarify that. (What is more
natural to you in reading code? Is one obviously wrong?)
phone[ '555-963' ]= 'Joan'
name[ 'Joan' ]= '555-963'
Consider "str(x)". It isn't saying "x is a string", it's saying "x as a
string". Similarly, "ord(x)" says "the ordinal value of x". So,
"phone[x]" means "the phone number of x".
[snip]
What's the best way to construct this class? Or, do you have an
argument that it could not be simpler than using a relational db?
Brainstorming, not flamestorming.
You could imagine an object where you provide a field name and a value
and it returns all those entries where that field contains that value.
That, basically, is a database.
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