Reverse for 'post_share' with arguments '('',)' not found. 1 pattern(s) tried: ['post_share/(?P[0-9]+)$']

Question

views.py

def post_share(request, post_id):
    posts = get_object_or_404(Post,id=post_id)
    sent = False

    if request.method == \'POST\':
        form =