Our default placeholders sometimes cause confusion, like in this thread. Perhaps different placeholders, like "[email protected]" and "YourTokenHere" will help with that.

Another thread: https://www.coursera.org/learn/practical-rl/discussions/all/threads/jxK8jdhzQ6iSvI3Yc-Oouw

If you know anything related to the current sections you can add.

If the path contains spaces, then
docker run -it -p 8888:8888 -p 6006:6006 -v /$(pwd)/session-1:/notebooks --name tf cadl /bin/bash
might throw the error
docker: invalid reference format: repository name must be lowercase.
or behave unexpectedly.

Wrapping in quotation marks solves this:
`docker run -it -p 8888:8888 -p 6006:6006 -v "/$(pwd)/session-1":/notebooks --name tf cadl /bin/bas

In https://github.com/csev/py4e/blob/master/book3/01-intro.mkd, I would like to suggest to improve readability by adding a space after the colon in:

python words.py
Enter file:words.txt
to 16

I.e., replace it by

python words.py
Enter file: words.txt
to 16

Not sure how easy this is to do but it would be great to speed up the generation of pylint error and warning messages in tooltip.

The API is well-defined in the code, but it would be nice to have it in ReadTheDocs.
It would also allow us to add bits of useful information, such as the fact that #470 exists.