Change ImportError to NotFoundModule

[macielti]

Changed the ImportError exception to NotFoundModule what is python3 compatible.

Now you are abble to run the demo/scan.py script with no problems when using python3.

[denisenkom]

ImportError class is present in all versions of Python, including latest: https://docs.python.org/3.9/library/exceptions.html#ImportError ModuleNotFoundError is present only in 3.6 and later. Also ModuleNotFoundError is a subclass of ImportError, so ImportError would also catch ModuleNotFoundError.

Can you explain why do you think this change is necessary?

[macielti]

When i tried to run the demo/scan.py on a Windows 7 32bits with Python 3.7.5 produces the following error:

The pull request changes solved the problem.

[denisenkom]

Line numbers don't match in your error message with source code. You probably have older version. Can you try latest version from github?

[macielti]

Yes. With a new fresh install of python 3.7.5 32bits on Windows 7 32bits:

• First i clone the repo and run from inside of it pip install .;
• After the module installation i go to the demo folder and try to run python scan.py test.png. After the scanner been activated and the progress bar is comming to the end i got this message error:
• As the message say i don't have the module PIL installed. So i run pip install pillow and again try to run python scan.py teste.png;
• And now all works fine. Sorry for wasting your time, i was willing to contrib for your source code. But i think that we have to add the Pillow module as a dependence.