How can I programmatically obtain the max_length of a Django model field?

Question

Say I have a Django class something like this:

class Person(models.Model):
    name = models.CharField(max_length=50)
    # ...

How can I p

Answer 1

The question is regarding models, but for people trying to do the same for forms (that's how I ended up in this thread), I think this approach is quite simple and clear:
1. In a template:
{{form.name.field.max_length}}

2. In python code (e.g. in the view)
form.name.field.max_length