I have attempted creating a test app a few times. I have spent a week on
this so far, with no real progress. Nothing seems to trigger the problem
other than the full app.
It seems very strange that passing local variables to BEAUTIFY as a list of
tuples works in a small app. Yet when the same list of tuples is generated
from sorted() it does not work. I even tried putting a sorted() function on
a dict in a test app, and it worked with a small app, but not the full app.
Very flakey.
Is BEAUTIFY and return locals() meant to work with a list of tuples? If
not, I'll just rewrite this. I thought it might work, but currently its
behavior is unpredictable. Sorry I don't have more details. If I am trying
to do something web2py wasn't meant to do, that would help me at least.
Please let me know.
Thanks,
On Saturday, June 18, 2016 at 9:08:50 PM UTC-7, Anthony wrote:
>
> Probably something else is going on. I suggest you create a minimal app
> that reproduces the problem and post it.
>
> Anthony
>
> On Saturday, June 18, 2016 at 8:47:42 AM UTC-4, DNeuman wrote:
>>
>> Hi - first time posting here! First let me say thanks to Professor Di
>> Pierro and all the people who have done a great job on Web2Py. I am new to
>> web development, and Python, so I really appreciate all the work you did to
>> make this subject approachable. Now for my question:
>>
>> I am having some difficulty passing a list of tuples from a controller
>> using 'return locals()' sometimes it hangs the web2py server.
>>
>> I have spent a week narrowing this down, and here is what I have; some
>> works, some does not...
>>
>> If I create a simple list named bob = [(2L, 0.2075327747768832), (16L,
>> 0.19108106970048253), (3L, 0.13288897732583363), (15L,
>> 0.11511204575971237), (12L, 0.10369170755981243), (7L, 0.1033849215142939),
>> (8L, 0.0957849868092478), (5L, 0.05052350890092832)]
>>
>> then return locals() I can see this in response._vars in the debugger
>> and {{=BEAUTIFY(response._vars)}} works fine. (thats good)
>>
>>
>> However, if I create the same exact list as an output of a sorting
>> operation from a dictionary, it hangs the web2py server when I use return
>> locals() and {{=BEAUTIFY(response._vars)}} (but only sometimes)
>>
>>
>> Here is what the code is used to generate the sorted list:
>>
>> def make_list():
>> from operator import itemgetter
>> #dbg.set_trace() # stop here!
>>
>> test_dict ={}
>>
>> test_dict[2L] = 0.773
>> test_dict[5L] = 0.003
>> test_dict[1L] = 0.31
>> test_dict[9L] = 0.0402
>> test_dict[12L] = 0.12
>> test_dict[7L] = 0.214
>>
>> test_list = sorted(test_dict.iteritems(), key=itemgetter(1),
>> reverse=True)
>>
>> return test_list #this should be a list of tuples
>> [(x,y),(w,z)...()]
>>
>>
>> But here is the weird part - if I have this test case standalone, it
>> always works. If I use sorted() in a larger program, it exhibits the hang.
>> Very consistent. standalone test = no problem. larger problem = broken.
>>
>> More about the server hang:
>>
>> passing bob through locals() causes a hang, whether BEAUTIFY(bob) or
>> BEAUTIFY(response._vars) as long as bob is generated from the sorted()
>> function. Never hangs when generated from simply creating a list of tuples.
>>
>>
>> passing bob through locals() doesn’t hang unless BEAUTIFY(bob). So, if I
>> don't use bob in the view, it doesn't hang. There is something about
>> passing this through locals, AND using BEAUTIFY AND creating the list from
>> sorted() AND being in a larger program.
>>
>>
>> making bob from sorted() in a large program = hang:
>>
>> use return locals() and BEAUTIFY(response._vars) -- hang
>>
>> use return locals() and BEAUTIFY(bob) -- hang
>>
>>
>> works:
>>
>> return locals() and BEAUTIFY(qlist)
>> -- no hang; qlist is some other variable
>>
>> return locals() and use view {{=bob[0] =bob[1] =bob[2] }}
>> -- no hang; here I simply don't use BEAUTIFY and it all works
>>
>> bob created without using sorted()
>> -- no hang; can do whatever I like and it works.
>>
>>
>>
>> So I can only guess that I am using sorted() wrong, or using BEAUTIFY
>> wrong, or there is some very mysterious aspect of the list that is not
>> visible in the debugger which is confusing BEAUTIFY.
>>
>>
>> when I examine response._vars in cases where there is a hang it is
>> identical to cases where there is no hang.
>>
>>
>> details:
>>
>> Mac OS X El Capitan 10.11.5
>>
>> Web2py 2.14.2-stable+timestamp.2016.03.24.22.47.49
>>
>> modules installed: numpy
>>
>> browser: Safari
>>
>>
>> Much appreciate any pointers here! Thanks.
>>
>>
--
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