Basically when you edit a field on a Model you need to makemigrations and migrate for changes to take effect in database.  
python manage.py makemigrations <optional_appname(If not provided it affects all apps.)> 
python manage.py migrate <optional_appname>
I'm working on a python-django project.
If a have a class where one of its attributes have

max_length=100

how can I change to

max_length=5000

? for instance...
Thank you!
modify max_length models python django