Hello. I'm new to both django and python.

This in an example code i made up to illustrate my problem:
# Models
class Book(models.Model):
    submitted_by = models.ForeignKey(settings.AUTH_USER_MODEL, 
related_name='book_subby')
    submitted_date = models.DateField(auto_now=True)
    book_title = models.CharField(max_length=200)
    book_publisher = models.ForeignKey(Publishers)


class Publishers(models.Model):
    submitted_by = models.ForeignKey(settings.AUTH_USER_MODEL, 
related_name='publisher_subby')
    submitted_date = models.DateField(auto_now=True)
    book_publisher = models.CharField(max_length=200)

# View
def book_list(request):
    books = Book.objects.filter(submitted_by=request.user, 
submitted_date__lte=timezone.now()).order_by('submitted_date')
    books_by_publisher = 
    return render(request, 'book/list_books.html', {
        'books': books 
        })

# Template list_books.html
{% for book in books %}
    <ul> {{ book.book_publisher }}
    <li> {{book.book_title }} </li>
{% endfor %}

This displays:

Publisher X
* Book A
Publisher Y
* Book B
Publisher X
* Book C
Publisher Y
* Book D

I want to display:
Publisher X
* Book A
* Book C

Publisher Y
* Book B
* Book D

I tried doing multiple for loops in the template, but couldn't make it work.
I would appreciate it alot if someone could nudge me in the right direction 
on how to solve this. 
Thanks, Andrea

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