Django: Concurrent access to settings.py
And yes, I want to store the data at the settings.py.

No you definitely don't want to do that. the settings.py file is configuring django and any pluggable apps that you may use with it. it's not intended to be used as a place for dumping data. Data goes into a database.
And don't forget that the settings.py file is usually read only once.
I am not sure whether I have to care about concurrency, but I didn't find any documentation about it. 
I have some data stored at my settings.py like ip addresses and each user can take one or give one back. So I have read and write operations and I want that only one user read the file at the same moment.
How could I handle this? 
And yes, I want to store the data at the settings.py. I found also the module django-concurrency. But I couldn't find anything at the documentation.