list() doesn't work in appengine?

Question

i am trying to use set function in appengine, to prepare a list with unique elements. I hit a snag when i wrote a python code which works fine in the python shell but not in appengine + django

This is what i intend to do(ran this script in IDLE):

import re
value='   [email protected], dash@ben,,  , [email protected]    '
value = value.lower()
value = list(set(re.split('^\s*|\s*,+\s*|\s*$', value)))
if (value[0] == ''):
    value.remove('')
print value

The desired output is(got this output in IDLE):

['dash@ben', '[email protected]', '[email protected]']

Now when i do something equivalent in my views.py file in appengine :

import os
import re
import django
from django.http import HttpResponse
from django.shortcuts import render_to_response # host of other imports also there
def add(request):

    value='   [email protected], dash@ben,,  , [email protected]    '
    value = value.lower()
    value = list(set(re.split('^\s*|\s*,+\s*|\s*$', value)))
    if (value[0] == ''):
        value.remove('')


    return render_to_response('sc-actonform.html', {
        'value': value,
    })

I get this error while going to the appropriate page(pasting the traceback):

Traceback (most recent call last):
File "G:\Dhushyanth\Google\google_appengine\lib\django\django\core\handlers\base.py" in get_response
  77. response = callback(request, *callback_args, **callback_kwargs)
File "G:\Dhushyanth\development\AppengineProjects\trunk_sanjhachoolha\sandbox\dushyanth\sanjhachoolha\views.py" in add
  148. value = list(set(re.split('^\s*|\s*,+\s*|\s*$', value)))
File "G:\Dhushyanth\development\AppengineProjects\trunk_sanjhachoolha\sandbox\dushyanth\sanjhachoolha\views.py" in list
  208. return respond(request, None, 'sc-base', {'content': responseText})
File "G:\Dhushyanth\development\AppengineProjects\trunk_sanjhachoolha\sandbox\dushyanth\sanjhachoolha\views.py" in respond
  115. params['sign_in'] = users.create_login_url(request.path)

  AttributeError at /sanjhachoolha/acton/add
  'set' object has no attribute 'path'

on commenting out:

#value = list(set(re.split('^\s*|\s*,+\s*|\s*$', value)))

I get the desired output in the appropriate webpage:

[email protected], dash@ben,, , [email protected]

I am sure the list() is the root of my troubles. CAn anyone suggest why this is happening. Please also suggest alternatives. The aim is to remove duplicates from the list.

Thanks

Answer 1

It seems like you implemented your own list() function. Its return statements should be at line 208 of your file (views.py). You should rename your list() function to something else (even list_()).

EDIT: Also you can change you regexp, like this:

import re
value='   [email protected], dash@ben,,  , [email protected]    '
value = value.lower()

#value = list(set(re.split('^\s*|\s*,+\s*|\s*$', value)))
#if (value[0] == ''):
#    value.remove('')

value = set(re.findall(r'[\w\d\.\-_]+@[\w\d\.\-_]+', value))

print value

re.findall() returns a list of all matched occurences.