Relative import: problem with depth

[sgouezel]

When trying to use relative imports, I realized that they did not work for files with more than 3 levels of subdirectories. Browing on Zulip, I found a message from Mario (from 2018!) saying the following:

I guess no one has ever tried to use 7 dots in a row in relative imports, but it doesn't work. The = should be a += here, and I tested that if you put import .......test it counts as only one level up (and in general k dots means k mod 3 levels up)