MyNotebook | my notebook during college days

What you pasted looks ok to me, and your code works for me without errors.

1. Perhaps something before or after that code is what is spoiling the class definition?
2. Perhaps you are running this in Jupyter or in IPython and you imported ImageRotationUtils previously, but then changed the code, and tried to reimport again -- and something was wrong with the new reimport so your definition did not get over-written? If that's the case, restart the environment (or the kernel in Jupyter) and rerun the code.
3. I would suggest putting a simple initialization code, like that constructor line, into the same source file and executing it as a separate process to test if that is the code or the environment issue.

As a matter of convenience and to avoid tweaking sys.path in your code, I would suggest adding your python directory to the PYTHONPATH environment variable before you load your environment, so you can just import.

I ran into the same issue. I think the problem might be that --to html uses the Jupyter Lab template by default. Once I added --template classic to my call to nbconvert the resulting HTML-file was much smaller and resembled the actual Jupyter notebook much more closely.

I faced a similar issue , while importing a custom script in jupyter notebook

Try importing the module as an alias then reloading it

Not sure how is the syntax for Python, since I use Typescript for CDK, but CDK constructs resolves in CloudFormation resources in the end, so it's actually possible.

Here's an example using Typescript:

It is because you have used same StringVar self.file_path for all the entries. You should use separate StringVar for each entry instead:

ttk.Notebook has an event called <>.

Here is an minimal example:

This is not so much an answer as a work in progress, given that a comment simply wouldn't hack it.

Given that you haven't stated when or how the error occurs and it's occurring somewhere in 1000 lines of code, which we can't see, right about now might be a good time for
a minimal, complete and verifiable example (mcve)
https://stackoverflow.com/help/minimal-reproducible-example

As you seem reluctant to provide one, let's try this:

I was able to make it work by hosting my file to download as static content as I was trying before. All of this is for a Mac, but it'll be similar for other platforms.

I had to define a custom template in order to get files at static_root so they could be served. Relevant documentation is here for setting up a custom template.

It isn't difficult.. you essentially create a directory where it's expected, copy over some of the default files, then add/change what you will. terminal record might look something like this: