The Scrub Extension provides an easy mechanism for obfuscating sensitive information from command line output. It is useful for debugging and for providing end-user output to developers without including sensitive info like IP addresses, phone numbers, credit card numbers, etc.

Scrubbing happens in a post_render hook by iterating over the list of tuples in App.Meta.scruband calling re.sub() on the text provided by the output handler in use. Therefore, all output produced by app.render() will be scrubbed… including JSON, YAML, or any other output handler.

API References:


  • No external dependencies


Application Configuration Settings

This extension does not rely on any application level configuration settings or meta options.

Application Meta Data

This extension honors the following App.Meta options:




A list of tuples in the form of [ ( 'REGEX', 'REPLACEMENT' ) ]


Example: Using Scrub Extension
Example: Using Scrub Extension
from cement import App
class MyApp(App):
class Meta:
label = 'myapp'
extensions = ['scrub', 'print']
scrub = [
# obfuscate ipv4 addresses
(r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}", '***.***.***.***'),
with MyApp() as app:
app.print('This is an IPv4 Address:')
$ python
This is an IPv4 Address:
$ python --scrub
This is an IPv4 Address: ***.***.***.***

In order for scrubbing to work, output must be rendered via a registered output handler. If only printing to console is desired, use the print extension along with app.print() (as in the above example).