One class per file?

[HCB]

Hello:

The book "Code Complete" recommends that you put only one class in a
source file, which seems a bit extreme for me. It seems that many
classes are small, so that putting several of them in a file seems
reasonable. I noticed that the decimal.py module in the standard
library has several classes, all of which of course revolve around the
"decimal" topic. Perhaps a better rule of thumb is "one idea per
file." I checked the Python style guide and there seems to be no
mention of this topic. I know this is an elementary question, but what
is the Python way of doing this?

Thanks for your time.
HCB