Basically if the log stream shows "Could not find setup.py or requirements.txt; Not running pip install." it means that the Oryx build process failed to find your requirements.txt file you can connect to the web app's container via SSH and verify that requirements.txt is named correctly and exists directly under site/wwwroot. If it doesn't exist, make site the file exists in your repository and is included in your deployment. If it exists in a separate folder, move it to the root.
Here is the Azure reference, plus I recommend to check up with some Django tutorials.