It works well on v12 as well. Try with python3 instead of ./

python3 odoo-bin scaffold your_module_name

1. Now odoo 10 or later version use odoo-bin insted of odoo.py
On the shell or terminal, change directory to your odoo folder. Maybe it's in /opt/odoo, or maybe it's in /home/odoo :

cd /opt/odoo
2. Create a new module using the odoo.py script:

./odoo.py scaffold my_new_module ./addons/
(where my_new_module is a name of your new module, and ./addons/ is the Odoo addons directory)

3. Edit the ./addons/my_new_module/__openerp__.py file.

nano ./addons/my_new_module/__openerp__.py
4. Change the name field to set a user friendly name of your module (for example "Andrius's New Module"). Change description and fields also. And add your needed modules, such as 'mail', to the to the list of module dependencies depends.

'depends': ['base', 'mail'],
5. Edit models.py

nano ./addons/my_new_module/models.py
6. Add code in your my_new_module/models.py file, for example:

from openerp import models, api

class FooterlessNotification(models.Model)
_inherit = 'mail.notification'

@api.model
def get_signature_footer(self, user_id, res_model=None, res_id=None, context=None, user_signature=True):
return ""
(As an example, this code will extend the 'mail.notification' model and replace its get_signature_footer method with one that returns an empty footer.)

7. Install your module via Odoo settings.
To find it there you may need to use the "Update Module List" option.

If you can't find the option "Update Module List" either, you may need to enable the "Technical Features" checkbox in your current user's settings.

To display Modules, not just the Applications, remove the tag "Applications" from the search box filter, by clicking the small "x" before the tag.

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Hi,

Please see this video: How To Create Custom Module in Odoo12 Easily Using Scaffold

Thanks