PyMOTW: cgitb – Detailed traceback reports

cgitb was originally designed for showing errors and debugging
information in web applications. It was later updated to include
plain-text output as well, but unfortunately wasn’t renamed. This has
led to obscurity and the module is not used as often as it should be.
Nonetheless, cgitb is a valuable debugging tool in the standard
library.

Read more at pymotw.com: cgitb