On 12/18/2013 09:45 PM, Alan Gauld wrote:
On 18/12/13 17:45, Mark Lawrence wrote:
Can I be so bold as to ask how discussing metaclasses and __setattr__ on
a tutor mailing list is going to help the newbie who's having problems
with their "hello world" program?
It won't, but the tutor list is a
On Wed, Dec 18, 2013 at 6:16 AM, spir wrote:
> On 12/18/2013 12:07 PM, eryksun wrote:
>>
>> You need __setattr__ from the metaclass:
>>
>> >>> class C: pass
>> ...
>> >>> type(C).__setattr__(C, "baz", "BAZ")
>> >>> C.baz
>> 'BAZ'
>
> Oh, that makes sense: so, __setattr__ o
On Wed, Dec 18, 2013 at 05:45:02PM +, Mark Lawrence wrote:
> Can I be so bold as to ask how discussing metaclasses and __setattr__ on
> a tutor mailing list is going to help the newbie who's having problems
> with their "hello world" program?
It's not just newbies who need tutoring. Sometim
On 18/12/13 17:45, Mark Lawrence wrote:
Can I be so bold as to ask how discussing metaclasses and __setattr__ on
a tutor mailing list is going to help the newbie who's having problems
with their "hello world" program?
It won't, but the tutor list is also for experienced programmers new
to Pyth
On 18/12/2013 11:16, spir wrote:
On 12/18/2013 12:07 PM, eryksun wrote:
On Wed, Dec 18, 2013 at 5:40 AM, spir wrote:
C.__setattr__(C, "baz", "BAZ")
which fails, for any reason, with
TypeError: can't apply this __setattr__ to type object
You need __setattr__ from the metaclass:
On 12/18/2013 11:51 AM, eryksun wrote:
On Tue, Dec 17, 2013 at 10:52 AM, spir wrote:
is it at all possible to set new vars (or any symbol) into an existing scope
(typically locals())?
scope[name] = value
raises by me an error like:
TypeError: 'mappingproxy' object does not support it
On 12/18/2013 12:07 PM, eryksun wrote:
On Wed, Dec 18, 2013 at 5:40 AM, spir wrote:
C.__setattr__(C, "baz", "BAZ")
which fails, for any reason, with
TypeError: can't apply this __setattr__ to type object
You need __setattr__ from the metaclass:
>>> class C: pass
...
On Wed, Dec 18, 2013 at 5:40 AM, spir wrote:
> C.__setattr__(C, "baz", "BAZ")
> which fails, for any reason, with
> TypeError: can't apply this __setattr__ to type object
You need __setattr__ from the metaclass:
>>> class C: pass
...
>>> type(C).__setattr__(C, "baz", "BAZ")
On Tue, Dec 17, 2013 at 10:52 AM, spir wrote:
> is it at all possible to set new vars (or any symbol) into an existing scope
> (typically locals())?
>
> scope[name] = value
> raises by me an error like:
> TypeError: 'mappingproxy' object does not support item assignment
>
> I guess 'mappin
On 12/18/2013 10:02 AM, Peter Otten wrote:
spir wrote:
[...]
Like Steven I have no idea how you produced the mappingproxy. Are you trying
to use a class as a namespace (in Python 3.3)?
class A: pass
...
A.__dict__["foo"] = "bar"
Traceback (most recent call last):
File "", line 1, in
Type
spir wrote:
> Hello,
>
> is it at all possible to set new vars (or any symbol) into an existing
> scope (typically locals())?
locals() normally contains a copy of the current namespace as a dict.
Setting items is possible but only alters the dict and has no effect on the
original namespace:
>
On Tue, Dec 17, 2013 at 04:52:25PM +0100, spir wrote:
> Hello,
>
> is it at all possible to set new vars (or any symbol) into an existing
> scope (typically locals())?
In general, no. The only time that writing to locals() is guaranteed to
work is when you are in the top-level scope and locals
Hello,
is it at all possible to set new vars (or any symbol) into an existing scope
(typically locals())?
scope[name] = value
raises by me an error like:
TypeError: 'mappingproxy' object does not support item assignment
I guess 'mappingproxy' is the implementation name of a scope (her
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