I think we can not use lists in a news entry.

Newlines in news entries are 'soft' so that each is re-wrapped to line lengths of (on my screen) 5 1/2 to 9 inches. (Shorter screen space get a horizontal scrollbar, longer has the extra space ignored.) The *s are not needed here anyway.

Thanks for pointing that out. Fixed.

To run all funcs and report each failure...

Done

As near as I could tell, the only different between the two strings is the 1 or 2 lines of Contents, so that the two could be replaced by one f string with

{"   0: None\n" if sys.flags.optimize else "
 "   0: 'Formatted details of methods, functions, or code.'\n   1: None\n"}

You can't put backslashes in f-strings, apparently 😞

You could use .format(...) instead, like we used to have to do. Or precalculate contents = ... before the string. But replacing " with ''' and either deleting \n or replacing with a literal newline should work. Revised suggested addition based on local testing:

{'''   0: None'''
if sys.flags.optimize else 
'''   0: 'Formatted details of methods, functions, or code.'
   1: None'''}

The newline after the closing } is added to either interpolation, so only one internal newline is needed between ''' quotes. The two trailing 'ns were a mistake. Put if ... else on a separate line or not; unquoted newlines between { and } do not matter.