Imagine you would like to process some file based next to your noteboook.
If you try to acess it without certain prerequisit (in form of mounting, and moving to proper directory) you will get FileNotFoundErrror
You have to do the following:
1) mount google drive
from google.colab import drive drive.mount('/content/drive')
2) navigate to right directory
import os os.chdir('/content/drive/My Drive/Colab Notebooks/python-audio-processing')