On 14/11/2011 10:05, Matej Cepl wrote:
Dne 11.11.2011 14:31, macm napsal(a):
def Dicty( dict[k1][k2] ):
When looking at this I returned to the question which currently rolls in
my mind:
What's difference/advantage-disadvantage betweeng doing multi-level
dicts/arrays like this and using tuple as a key? I.e., is it more
Pythonic to have
dict[k1,k2]
instead?
For me, it would depend on what the data meant. To give an obvious
example: if you were storing things which were based on coords, then
clearly map[x, y] is more meaningful than map[x][y]. Conversely, if your
dictionary structure was, say, a set of preferences for users, then
prefs[username][prefname] is probably a more useful model.
Sometimes it's not so clear, in which case one person might opt for one
approach while another opted for another while modelling the same data
concepts. If, for example, you were modelling a set of book reviews
where each review might have one or more genres (which you could display
as a tag-cloud, say) then you could consider the model to be
a sort of book-genre tag cloud:
book_genres[title, genre]
or a list of books in each genre:
genres[genre][title]
or a list of genres for each book:
books[title][genre]
or even multiple ways if that made it easier to use in one situation
or another.
Stating-the-obvious-ly yours,
TJG
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