_set in django

# Now, given object e of type Entry, you would do e.blog to access 
# the related object Blog - which is a forward relation. 

class Blog(models.Model):
    pass

class Entry(models.Model):
    blog = Blog(..)

# The _set is a reverse lookup class variable django puts in for you.    
# So, given object b - you would do:
entries = b.entry_set.all()

Here is what the above code is Doing:
1. Create a Blog model
2. Create an Entry model
3. Create a blog object
4. Create an entry object
5. Associate the entry object with the blog object
6. Retrieve all the entries associated with the blog object