Occurs when trying to import a local module that Python cannot find.
from my_utils import greet
greet()ModuleNotFoundError: No module named 'my_utils'
# Make sure my_utils.py exists in the same directory
from my_utils import greet
greet()I thought the file was there, but it turned out Python couldn't see it. In my case, the file was either missing or not in the same folder as the script.