Is it necessary to differentiate the asserted contents? What if we ditched the (if defined) part (always)?

Since actual is a list of strings, the change of even a single character in the expected output will result in the false-y assertion. The below could work but its readability is quite worse:

assert any('      list of weak references to the object' in output_part for output_part in actual)

Oh, I thought actual is a string and we are checking a substring here. Never mind me then.

...or I could join actual to achieve a single string and use in operator without more hassle.

Looks good!

I didn't spot this PR and opened a fairly-similar one this week: #11793

In fact #11793 is better, because in the latest version the condition is improved (0b55aae).

Closed by #11793.

A