Django Notes: read values from settings in a safe way
Posted on Sat 29 August 2015 in Django, HowTo, Programmazione, Python • Tagged with Django, getattr, Python, settings
Working on Django projects I find very often that many developers access the values that are defined in settings in this way
from django.conf import settings my_value = settings.MY_SETTING
What happens if
MY_SETTING has not been defined in settings.py?
The code will raise an error and crash, of course. How can we make the
code more reliable? We could try/except the code block that tries to
read the value and maybe set a value if we get an exception, but this
would not be a clean way to do this job.
A cleaner way to do it is to use getattr in this way:
from django.conf import settings my_value = getattr(settings, 'MY_SETTING', 'my-default-value')
getattr will try to read
MY_SETTING value from settings.py,
if the value doesn't exist
my_value will be assigned with