Django views.py file argument passing

I am using Django 2.0.6. My folder structure is like this:

mysite
    mysite
    polls 
        templates
            polls
                index.html
                choice.html

Please consider that all the other files are present. I am not mentioning them here. I have designed a URL in the format of 'polls/question/choice'. Here question is a variable which I am passing as a argument. Now I have designed a Question class in models.py

from django.db import models
from datetime import timedelta
from django.utils import timezone

class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __str__(self):
        return self.question_text

    def recent_publish(self):
        return self.pub_date >= timezone.now() - timedelta(days=1)

class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

    def __str__(self):
        return self.choice_text

Now I have pointed my url mapping like this in polls/urls.py:

path('<str:ques>/choice/',views.choice,name='choice')

And in the views file my choice function is like this

def choice(request,ques):
    for q in  Question.objects.all():
        if q.question_text == ques:
            break

    return render(request,'polls/choice.html',{'q':q})

So here I am passing q which is a object of Question class to choice.html

Now here is choice.html

{% for e in q.choice_set.all() %}
    <h1>{{e}}</h1>enter code here

And this is error I am getting

In template C:\Users\Nik\Desktop\mysite\polls\templates\polls\choice.html, 
error at line 1

Could not parse the remainder: '()' from 'q.choice_set.all()'
1   {% for e in q.choice_set.all() %}
2       <h1>{{e}}</h1>

Is my syntax wrong or something else?