On Thu, 12 Mar 2015 22:04:30 +1100, Steven D'Aprano
wrote:
>
>3-4 seconds to instantiate is a bit worrying, but you should look at
>improving the efficiency of loading a map rather than insisting that there
>should be only one map instance. Particularly in the map editor, what if
>the user wants
On Thu, 12 Mar 2015 21:41:16 +1300, Gregory Ewing
wrote:
>Mario Figueiredo wrote:
>> But PyCharm flags the assignment
>> with a warning telling me that generate() does not return anything and
>> the I lose code completion on the mmap variable.
>
>My guess is that there is a syntax error somewhere
On Thu, 12 Mar 2015 22:29:24 +1100, Steven D'Aprano
wrote:
>
>I would have a loadfile() method which takes a filename on disk, opens the
>file and passes the contents (or the open file object) to another method,
>load() to do the actual work:
>
>
>class Map:
>def __new__(cls, width, height, f
Mario Figueiredo wrote:
> On Thu, 12 Mar 2015 16:31:12 +1100, Steven D'Aprano
> wrote:
>
>>Mario Figueiredo wrote:
>>
>>
>>If this is supposed to be a singleton, you can't create more instances.
>>The point of a singleton that there is only one instance (or perhaps a
>>small number, two or three
Mario Figueiredo wrote:
> It's just a cheap global, since is ubiquitous throughout the entire
> application, does behave like a singleton, and is a bit too expensive
> to create. A full map in the main application takes 3 or 4 seconds to
> instantiate and occupies around 2 Mb of memory.
2MB is no
On Thu, 12 Mar 2015 21:40:03 +1300, Gregory Ewing
wrote:
>Mario Figueiredo wrote:
>
>> A different application, a map editor, needs to also instantiate an
>> object of the class Map. But in this case the map needs to either be
>> empty (if the user wants to create a new map), or loaded from the
>
On Thu, 12 Mar 2015 21:38:00 +1300, Gregory Ewing
wrote:
>
>I would just provide a function:
>
>_map = None
>
>def get_map():
>global _map
>if _map is None:
> _map = Map()
>return _map
>
>and document the fact that you shouldn't call Map()
>directly.
Oh, you are so right! Been
Mario Figueiredo wrote:
But PyCharm flags the assignment
with a warning telling me that generate() does not return anything and
the I lose code completion on the mmap variable.
My guess is that there is a syntax error somewhere
in your code that's confusing the IDE.
--
Greg
--
https://mail.pyt
Mario Figueiredo wrote:
A different application, a map editor, needs to also instantiate an
object of the class Map. But in this case the map needs to either be
empty (if the user wants to create a new map), or loaded from the
saved map file (if the user wants to edit an existing map).
Then yo
Mario Figueiredo wrote:
It's just a cheap global, since is ubiquitous throughout the entire
application, does behave like a singleton, and is a bit too expensive
to create. A full map in the main application takes 3 or 4 seconds to
instantiate and occupies around 2 Mb of memory.
There's nothin
On Wed, 11 Mar 2015 16:47:32 -0700, Ethan Furman
wrote:
>
>You're code is good.
Thanks for taking a weight off my shoulder.
>
> The only question is if you /really/ need a singleton -- and only
> you can answer that (although plenty of folks will tell you you
> don't ;) .
Yeah. I debated that
On Thu, 12 Mar 2015 16:31:12 +1100, Steven D'Aprano
wrote:
>Mario Figueiredo wrote:
>
>
>If this is supposed to be a singleton, you can't create more instances. The
>point of a singleton that there is only one instance (or perhaps a small
>number, two or three say). Why do you need two differen
Mario Figueiredo wrote:
> I'm fairly new to Python, so I don't know if the following is me
> abusing the programming language idioms, or simply a mistake of my IDE
> code inspection routine.
>
> I have a singleton Map class which is defined like so:
>
> class Map:
> _instance = None
> de
On 03/11/2015 04:33 PM, Mario Figueiredo wrote:
> The following code runs just fine. But PyCharm flags the assignment
> with a warning telling me that generate() does not return anything and
> the I lose code completion on the mmap variable.
>
> if __name__ == '__main__':
> mmap = Map.generat
I'm fairly new to Python, so I don't know if the following is me
abusing the programming language idioms, or simply a mistake of my IDE
code inspection routine.
I have a singleton Map class which is defined like so:
class Map:
_instance = None
def __new__(cls):
if Map._instan
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