[web2py] Re: Issue with defaultdict(list)
Hi Drew and all,
I saw the same exact problem Drew saw with *defaultdict(list)*. For the
benefit of any future debuggers, I thought I'd document what went wrong in
our case.
One of the functions in the controller was inappropriately named *list()*,
thus overriding the definition of *list()* itself. By the time the model
code was called -- *g = defaultdict(list)* and then
*g['foo'].append('someValue')* -- it raised the *AttributeError: 'dict'
object has no attribute 'append'* exception that Drew saw.
This problem would not occur if the controller was not involved - i.e. from
the Python interpreter.
warm regards,
On Friday, March 16, 2018 at 8:22:06 PM UTC-5, Drew Howell wrote:
>
> After taking a break and working on another section, I finally found what
> was causing the issue. There was, indeed, an error elsewhere within that
> controller, which was causing me all the headache. I appreciate your guys'
> help! Thanks.
>
> On Sunday, March 11, 2018 at 11:14:27 PM UTC-4, Drew Howell wrote:
>>
>> I seem to be having issues getting defaultdict to work within Web2Py. I
>> am using Web2Py version 2.16.1 (Python 2.7.11).
>>
>> Here is the code in my controller:
>> from collections import defaultdict
>> g = defaultdict(list)
>> g['someKey'].append('someValue')
>>
>> Here is the error I'm getting:
>>
>> File "D:/web2py/applications/fpr/controllers/students.py"
>> , line
>> 14, in view
>> g['someKey'].append('someValue')
>> AttributeError: 'dict' object has no attribute 'append'
>>
>> If I do the same thing in the Python Interpreter, I don't seem to get the
>> issue.
>>
>> >>> from collections import defaultdict
>> >>> g = defaultdict(list)
>> >>> g['k'].append('v')
>> >>> print g['k']
>> ['v']
>>
>> Am I implementing this wrong or is there some sort of issue with using
>> defaultdict(list) in Web2Py?
>>
>>
--
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[web2py] Re: Issue with defaultdict(list)
After taking a break and working on another section, I finally found what
was causing the issue. There was, indeed, an error elsewhere within that
controller, which was causing me all the headache. I appreciate your guys'
help! Thanks.
On Sunday, March 11, 2018 at 11:14:27 PM UTC-4, Drew Howell wrote:
>
> I seem to be having issues getting defaultdict to work within Web2Py. I am
> using Web2Py version 2.16.1 (Python 2.7.11).
>
> Here is the code in my controller:
> from collections import defaultdict
> g = defaultdict(list)
> g['someKey'].append('someValue')
>
> Here is the error I'm getting:
>
> File "D:/web2py/applications/fpr/controllers/students.py"
> , line
> 14, in view
> g['someKey'].append('someValue')
> AttributeError: 'dict' object has no attribute 'append'
>
> If I do the same thing in the Python Interpreter, I don't seem to get the
> issue.
>
> >>> from collections import defaultdict
> >>> g = defaultdict(list)
> >>> g['k'].append('v')
> >>> print g['k']
> ['v']
>
> Am I implementing this wrong or is there some sort of issue with using
> defaultdict(list) in Web2Py?
>
>
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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[web2py] Re: Issue with defaultdict(list)
Drew most likely what's happening is a variation of this
g = defaultdict(list)
g['foo'] = {'id': 1} # this could be any dictionary
g['foo'].append('someValue')
AttributeError: 'dict' object has no attribute 'append'
Note that defaultdict only gives you the default if the key doesn't have a
value already .
--
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[web2py] Re: Issue with defaultdict(list)
I think I've narrowed it down to having an error somewhere in my 'students' controller. 1. If I remove all other functions within that controller, it works. 2. If I create a new controller and only have that function, it works. 3. If I put the same exact code in another existing controller, it works. I will have do some more testing to figure out where my actual problem lies.Will report back with any results. -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[web2py] Re: Issue with defaultdict(list)
I am running from source, but still seem to have the issue.
On Monday, March 12, 2018 at 1:55:51 AM UTC-4, Val K wrote:
>
> Hi!
> If you're Windows user it's requires to run web2py from source (not
> web2py.exe) to get modules that are installed on your machine
I was doing some testing and it seems to work perfectly fine when I run it
from default.py. However, any time I try to run it from the controller I
need it in, it doesn't work. I even created the "test" function that worked
for you, and I still get the "AttributeError: 'dict' object has no
attribute 'append'". This one has really got me scratching my head.
On Monday, March 12, 2018 at 7:14:59 AM UTC-4, Leonel Câmara wrote:
>
> This controller worked fine for me:
>
> def test():
> from collections import defaultdict
> g = defaultdict(list)
> g['somekey'].append('somevalue')
> return response.json(g)
>
>
>
> You probably have a bug in your view. You can show us the code if you want.
>
--
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[web2py] Re: Issue with defaultdict(list)
This controller worked fine for me:
def test():
from collections import defaultdict
g = defaultdict(list)
g['somekey'].append('somevalue')
return response.json(g)
You probably have a bug in your view. You can show us the code if you want.
--
Resources:
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