Convert data.frame factor columns to character columns before trying to replace NULL values.
Find NULLs in a dataframe using is.na().
Ctrl-Z to the rescue. ‘nuf said.
Python’s logging facility is an alternative to adding (and removing) debug print statements. With logging we can toggle debug setting ON and OFF.
Save a Google Colab notebook to another format, such as HTML or PDF.
When HTML files on GitHub are too big to render, here’s a quick work-around.