[Greg Wilson]
> 4. "Aren't tuples redundant?"
>
> I explained that the const-ness of tuples was needed so that they
> could be used as dictionary keys. The guy with Perl in his background
> immediately asked if that's reliable --- a tuple can contain a list,
> which can be mutated. You've all heard this one more times than I
> have...
I guess you didn't try it:
>>> t = ([0,1],2)
>>> d = {}
>>> d[t] = "hooey"
Traceback (innermost last):
File "<stdin>", line 1, in ?
TypeError: unhashable type
>>>
To pass the hash test, it needs to have immutable contents
as well.
To my mind, the "can act as dictionary key" argument is a red
herring. Tuples and lists may technically be almost the same
thing, but I find I hardly ever need to ponder whether I should
use a tuple or a list. Tuples are structures and lists are
containers. Yes, you can use a container as a structure. You
can also use a bucket as a spoon.
or-stick-your-head-straight-into-the-trough-ly y'rs
- Gordon
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4