How can i solve this errors in python django?

Question

Hi im very novice at python django.

This is my django views.py codes

def post_list(request):
request.session['lat'] = request.POST['user_lat']
request.session['lon'] = request.POST['user_lon']
userpoint = GEOSGeometry('POINT('lat' 'lon')', srid=4326)
list_total = list_1
i=1
while i:
    list_i = Post.objects.filter(point_distance__lte = userpoint, D(km=i)
    list_total = 'list_total' + ',' + 'list_i')
    result_list = list(chain(list_total))
    if len(result_list) >= 50 :
        break

template = loader.get_template('blog/index.html')
context = {
    'post_list': post_list,
}

return HttpResponse(template.render(context, request))

First of all, I want make list to using request.session[]=request.POST[] to make coordinates and this coordinates will be used on my pointfield at 'model.py' is it possible? or is it has any problems?

And Second, in terminal(ubuntu16.04), i used python3 manage.py makemigrations command, it gave me messages as follows, from codes like this,

request.session['lat'] = request.POST['user_lat']
request.session['lon'] = request.POST['user_lon']
userpoint = GEOSGeometry('POINT('lat' 'lon')', srid=4326)

error occured like this->

userpoint = GEOSGeometry('POINT('lat' 'lon')', srid=4326)
                                  ^
                               SyntaxError: invalid syntax

from code like this ,

list_i = Post.objects.filter(point_distance__lte = userpoint, D(km='i'))
                                                                                                                ^

SyntaxError: positional argument follows keyword argument

this SyntaxError occoured.

Last, from this code,

while i:
    list_i = Post.objects.filter(point_distance__lte = userpoint, D(km=i))
    list_total = 'list_total' + ',' + 'list_i')
    result_list = list(chain(list_total))
    if len(result_list) >= 50 :
        break

-> This SyntaxError occoured.

list_total = list_total + ',' + 'list_i'
         ^

SyntaxError: invalid syntax

How can i solve this problems?

while i:
    list_i = Post.objects.filter(point_distance__lte = userpoint, D(km=i))
    list_total = 'list_total' + ',' + 'list_i')
    result_list = list(chain(list_total))
    if len(result_list) >= 50 :
        break

ps. I want make my own result_list using list(chain()) function, but i wonder it is valid.

itertools - python doc : https://docs.python.org/3.3/library/itertools.html i was according to GEOdjango codes : https://docs.djangoproject.com/en/dev/ref/contrib/gis/db-api/#distance-lookups

Im using python3 (maybe 3.5) , django 1.9

thanks for reading my questions.

jogco · Accepted Answer · 2016-07-18 07:17:56Z

2

You can not instantiate a GEOSGeometry object with that mis-formed string. Use

userpoint = GEOSGeometry('POINT('+ latvariable + ' ' + lonvariable +')', srid=4326)

answered Jul 18, 2016 at 7:17

jogco

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Comments

frist · Accepted Answer · 2016-07-18 07:05:50Z

1

You've missed the closing backet at line:

list_i = Post.objects.filter(point_distance__lte = userpoint, D(km=i)

answered Jul 18, 2016 at 7:05

frist

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2 Comments

David Foie Gras Over a year ago

Thank you. But even after i added backet, 'SyntaxError: positional argument follows keyword argument' has been made at 'D(km=i) '. how can i solve it?

frist Over a year ago

@touchingtwist list_i = Post.objects.filter(D(km=i), point_distance__lte = userpoint)

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