You missed an f-string

[rmanthorpe]

Line 469: assert(y > 42, format(f"y is $y, should be greater than 42"));

[schveiguy]

In fact, f strings don't seem to exist anywhere except one spot. I think they were removed (a decision I agree with). However, there is still mention in the text about handling both styles, which should also be removed.

[rmanthorpe]

Yeah that's what I meant - @andralex missed one when removing the f-string syntax

[schveiguy]

oof, totally misread your comment! Yes, and there are more mentions of format strings that need addressing (maybe separate issue though).

[rmanthorpe]

You're much more observant than I am! I only spotted the one!