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"
>> <http://127.0.0.1:8000/admin/default/edit/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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