Reverse for 'reg/{{post.pk}}/' with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried: []

would like to press save button then call post_detail and append to csv, 

it return error

<button type="submit" class="save btn btn-default" onClick="window.location.href='{% url 'reg/{{post.pk}}'  %}'">Save</button>

Reverse for 'reg/{{post.pk}}/' with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried: []

urls.py

from django.conf.urls import include, url

from . import views

urlpatterns = [

    url(r'^reg/$', views.post_new, name='post_new'),

    url(r'^reg/(?P<pk>\d+)/$', views.post_detail, name='post_detail'),

]

views.py

from .forms import PostForm

from django.shortcuts import render

from django.template.loader import get_template

def post_new(request):

    form = PostForm()

    return render(request, 'registration.html', {'form': form})

def post_detail(request, pk):

    post = get_object_or_404(Post, pk=pk)

    if request.method == "POST":

        form = PostForm(request.POST, instance=post)

        if form.is_valid():

            post = form.save(commit=False)

            post.author = request.user

            post.ProjectName = request.ProjectName

            post.UserName = request.UserName

            post.Company = request.Company

            post.Contact = request.Contact

            post.InitialPassword = request.InitialPassword

            post.UserType = request.UserType

            post.BusinessType = request.BusinessType

            post.published_date = timezone.now()

            post.save()

            return redirect('registration.html', pk=post.pk)

    else:

        form = PostForm(instance=post)

    return render(request, 'registration.html', {'form': form})

models.py

from django.db import models

from django.utils import timezone

from django.apps import AppConfig

import csv

import os.path

USERTYPE = (  

    ('Technology Partner', 'Technology Partner'),

    ('Others', 'Others'),

)

BUSINESSTYPE = (  

    ('Building', 'Building'),

    ('Data Analysis', 'Data Analysis'),

)

class MyAppConfig(AppConfig):

    name = 'src.my_app_label'

    def ready(self):

        post_migrate.connect(do_stuff, sender=self)

class Post(models.Model):

    author = models.ForeignKey('auth.User')

    Email = models.CharField(max_length=70)

    ProjectName = models.CharField(max_length=70)

    UserName = models.CharField(max_length=70)

    Company = models.CharField(max_length=70)

    Contact = models.CharField(max_length=70)

    InitialPassword = models.CharField(max_length=70)

    UserType = models.CharField(max_length=30, choices=USERTYPE)

    BusinessType = models.CharField(max_length=30, choices=BUSINESSTYPE)

    #UserType = models.ChoiceField(choices=USERTYPE, required=True )

    #BusinessType = models.ChoiceField(choices=BUSINESSTYPE, required=True )

    #ProjectName = models.TextField()

    created_date = models.DateTimeField(default=timezone.now)

    published_date = models.DateTimeField(blank=True, null=True)

    def publish(self):

        self.published_date = timezone.now()

        isexist = os.path.isfile('newusers.csv') 

        with open('/home/martin/Downloads/site1/site1/reg/newusers.csv', 'a') as csvfile:

          fieldnames = ['name','email address','project','initial password','userType','contact','businessType','company']

          writer = csv.DictWriter(csvfile, fieldnames=fieldnames)

          if isexist == false:

             writer.writeheader()

          writer.writerow({'name': UserName, 'email address': Email, 'project': ProjectName, 'initial password': InitialPassword,'userType': UserType, 'contact': Contact, 'businessType': BusinessType, 'company': Company,})

        self.save()

    def __str__(self):

        return self.title

forms.py

from django import forms

from .models import Post

USERTYPE = (  

    ('Technology Partner', 'Technology Partner'),

    ('Others', 'Others'),

)

BUSINESSTYPE = (  

    ('Building', 'Building'),

    ('Data Analysis', 'Data Analysis'),

)

class PostForm(forms.ModelForm):

    #if form.is_valid():

     #post = form.save(commit=False)

     #post.author = request.user

     #post.published_date = timezone.now()

     #post.save()m

    class Meta:

        model = Post

        fields = ('Email', 'ProjectName', 'UserName', 'Company', 'Contact', 'InitialPassword','UserType','BusinessType')

#fields = ('title', 'text',)

        UserType = forms.ChoiceField(choices=USERTYPE, required=True )

        BusinessType = forms.ChoiceField(choices=BUSINESSTYPE, required=True )

registration.html

{% block content %}

    <h1>New user registration</h1>

    <form method="POST" class="post-form">{% csrf_token %}

        {{ form.as_p }}

        <button type="submit" class="save btn btn-default" >Save</button>

    </form>

{% endblock %}

    

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