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.
--
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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